JP2001256606A - Magnetic head and method of its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize so proper recording and reproducing characteristics. SOLUTION: A metal magnetic film 5, as a main core material, is formed on a ferrite substrate 4 as an auxiliary core material. A magnetic gap S2 is formed by constructing a pair of the metal magnetic films 5 which butt against each other. At this time, edge positions P1 and P2 of the metal magnetic films 5 are formed deviated by a prescribed quantity of deviation in a prescribed direction with respect to edge positions P3 and P4 of the ferrite substrates 4. Thereby, even when a pseudo-gap is generated at an interface S1 between the ferrite substrate 4 and the metal magnetic film 5, a region L2 which is greatly affected by the pseudo-gap can be made small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head in which a surface on which a magnetic film is formed on a substrate and a magnetic gap are substantially parallel, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, in the field of magnetic recording, higher recording densities have been promoted, and magnetic recording media having high coercive force and high residual magnetic flux density have been used. As such a magnetic recording medium, for example,
There is a metal tape or the like in which a ferromagnetic metal material is directly applied on a nonmagnetic support. Accordingly, in a magnetic head, it is required to form a magnetic core using a material having high saturation magnetic flux density and high magnetic permeability.

In order to satisfy such requirements, a metal magnetic film having a high saturation magnetic flux density is formed as a main core material on ferrite as an auxiliary core material, and a magnetic gap is formed by the metal magnetic film. So-called MIG
(Metal In Gap) type magnetic heads (hereinafter referred to as MIG heads) have been proposed.

As a MIG head, for example, a multilayer head 100 as shown in FIG. 17 has been proposed. As shown in FIG. 17, the multilayer head 100 includes a pair of magnetic core halves 101 and 102 joined via a nonmagnetic thin film 103. The magnetic core halves 101 and 102 are
A metal magnetic body 107 formed by laminating a plurality of metal magnetic films 105 via a non-magnetic thin film 106 is provided between the layers. In the multilayer head 100, the metal magnetic body 107 forming the magnetic path has a configuration in which the metal magnetic film 105 is stacked via the non-magnetic thin film 106, so that eddy current loss can be reduced. Has advantages. Further, in the multilayer head 100, the interface between the substrate material 104 and the metal magnetic body 107 is not parallel to the abutting surface of the pair of magnetic core halves 101 and 102 forming the magnetic gap. Is prevented from acting as a pseudo gap.

As a MIG head, for example, a TSS (Tilted Sendust Sputter) head 110 as shown in FIG. 18 has been proposed. The TSS head 110 is
As shown in FIG. 18, a pair of magnetic core halves 111, 11
2 are joined together via a non-magnetic thin film 113 at the butting surface serving as a magnetic gap. Magnetic core half 111,
Reference numeral 112 denotes a metal magnetic film 115 formed on an inclined surface of a substrate material 114 formed to be inclined with respect to the abutting surface. In addition, the substrate material 114 is filled with the low-melting glass 116 on the inclined surface on which the metal magnetic film 115 is formed, and is flattened at the abutting surface. TSS head 110
Since the interface between the substrate material 114 and the metal magnetic film 115 is not parallel to the abutting surface serving as a magnetic gap, this interface is prevented from acting as a pseudo gap.

In addition, MIG which has been widely used conventionally
As the head, for example, there is a so-called parallel film MIG head 120 as shown in FIG. As shown in FIG. 19, the parallel film MIG head 120 is formed by joining a pair of magnetic core halves 121 and 122 via a non-magnetic thin film 125 at an abutting surface serving as a magnetic gap. The magnetic core halves 121 and 122 are provided on the substrate material 123 by the metal magnetic film 1.
The magnetic gap is formed by the metal magnetic film 124 abutting on the abutting surface via the non-magnetic thin film 125. In addition, substrate material 1
23 is cut out in the depth direction from the abutting surface at both ends of the magnetic gap, whereby the width of the magnetic gap,
That is, the track width is regulated. In addition, substrate material 1
In 23, the notched portion is filled with the low-melting glass 126, and the butted surface is flattened.

[0007]

Incidentally, the above-mentioned laminated type head 100 and TSS head 110 are excellent in recording / reproducing characteristics due to reduction of eddy current loss and prevention of a pseudo gap. However, the parallel film M
As compared with the IG head 120, the manufacturing process is complicated and therefore expensive. Therefore, in order to reduce the cost, the parallel film MIG head 120 is used. However, in the parallel film MIG head 120, the interface between the substrate material 123 and the metal magnetic film 124 is formed on the abutting surface serving as a magnetic gap. On the other hand, there is a problem that this interface acts as a pseudo gap because it is parallel.

That is, in the parallel film MIG head 120, since the interface between the substrate material 123 and the metal magnetic film 124 acts as a pseudo gap, when the magnetic signal to be reproduced is detected by the magnetic gap, the pseudo gap is generated. Due to the gap, a magnetic signal not to be reproduced is also detected. As a result, swell (ripple) occurs in the output during reproduction. Therefore, the parallel film MIG head 120
However, it has been difficult to detect a minute magnetic signal with high accuracy and improve the reproduction characteristics.

On the other hand, as the recording density is further increased, it is desired that the pitch in the width direction of a recording pattern recorded on a magnetic recording medium, that is, the so-called track pitch, be reduced. In this case, in the magnetic head, there is a problem that the influence of crosstalk from an adjacent recording track increases, the SN ratio deteriorates, and the error rate increases. Therefore, as shown in FIG.
Magnetic head 130 constructed by intentionally shifting four
Has been proposed. Note that FIG. 20 is the same as FIG. 19 except that the metal magnetic films 124 are displaced from each other, so that the description is omitted and the same reference numerals are given.

In the magnetic head 130, as shown in FIG. 21, the direction of the bisector of the opening angle θ1 due to the displacement between the metal magnetic films 124 in the magnetic gap is the direction opposite to the azimuth angle of the adjacent recording track. In this case, the crosstalk decreases, and as shown in FIG. 22, when the bisector direction of the opening angle θ1 due to the displacement between the metal magnetic films 124 is the same as the azimuth angle of the adjacent recording track, It is known that crosstalk increases. Therefore, in the magnetic head 130, as shown in FIG. 21, it has been proposed to reduce the crosstalk by shifting the metal magnetic films 124 and butting them.

As described above, the magnetic head 130 has the metal magnetic film 124 at the portion where the magnetic gap is formed.
Due to the misalignment, crosstalk from adjacent recording tracks during reproduction can be reduced. However, when recording is performed on a magnetic recording medium using the magnetic head 130, the core interval at a portion where the metal magnetic films 124 are shifted from each other is narrowed, so that the fringe amount at the track edge increases, and as a result, There has been a problem that a phenomenon that a magnetic signal recorded on an adjacent recording track is destroyed, that is, a so-called side erase phenomenon becomes remarkable.

In order to reduce the side erase phenomenon,
As shown in FIGS. 23 to 25, there has been proposed a magnetic head 140 in which a track width is regulated by trimming a substrate material 123 at a portion where a magnetic gap is formed. 23 to 25, the same or equivalent parts as those in FIG. 20 are denoted by the same reference numerals, and description thereof will be omitted.

However, in the magnetic head 140, since the substrate material 123 needs to be trimmed after the pair of magnetic core halves 121 and 122 are joined, the manufacturing process becomes complicated and the cost increases. was there.

Therefore, the present invention is proposed in view of the above-mentioned conventional situation, and shows good recording / reproducing characteristics in response to the increase in recording density, and provides low recording / reproducing characteristics without going through a complicated process. It is an object of the present invention to provide a magnetic head that can be manufactured at low cost and a method of manufacturing the same.

[0015]

According to the magnetic head of the present invention, a pair of magnetic core halves each having a magnetic film formed on a substrate are joined by abutting surfaces parallel to the film forming surface of the magnetic film. A magnetic gap is formed by abutting through the non-magnetic film. The width of the magnetic gap is regulated by notching the substrate at both ends in the depth direction from the abutting surface. In the magnetic gap, the edge position of the magnetic film is shifted by a predetermined amount in a predetermined direction from the edge position of the substrate.

In the magnetic head according to the present invention configured as described above, since the edge position of the magnetic film is shifted with respect to the edge position of the substrate, an interface between the magnetic film and the substrate where a pseudo gap is easily formed is provided. Can be offset from the recording track. Therefore, the influence of the pseudo gap can be reduced, and the reproduction characteristics can be improved.

Also, in the magnetic head according to the present invention, the pair of magnetic core halves are butted against each other on the abutting surface so that the magnetic films are shifted from each other. However, it is desirable that the magnetic films are shifted from the edge position of the substrate in the same direction as the shift direction of the magnetic films. As a result, the width of the rounded portion at the edge position of the magnetic film on the track determination side is reduced, so that the fringe amount at the track edge is suppressed, and side erasure during recording can be prevented. Therefore, not only can the effect of the magnetic gap be reduced, but also the side erase phenomenon can be prevented even when the magnetic films are shifted and butted for the purpose of reducing crosstalk during reproduction.

Further, in the method of manufacturing a magnetic head according to the present invention, a pair of magnetic core halves each having a magnetic film formed on a substrate may be joined by abutting surfaces parallel to a film forming surface of the magnetic film. This is a method for manufacturing a magnetic head in which a magnetic gap is formed by abutting via a magnetic film. And it has a groove forming step and a film forming step. In the groove forming step, a track width regulating groove for regulating the width of the magnetic gap is formed in the substrate. In the film forming step, by performing sputtering in an oblique direction with respect to the substrate, the edge position is shifted by a predetermined shift amount in a predetermined direction with respect to the edge position of the substrate in a portion to be the magnetic gap. A magnetic film is formed.

According to the method of manufacturing a magnetic head according to the present invention as described above, the film is formed by shifting the edge position of the magnetic film with respect to the edge position of the substrate only by sputtering the substrate in an oblique direction. Thus, the influence of the pseudo gap is reduced, and a magnetic head with improved reproduction characteristics can be manufactured. Further, by performing sputtering in an oblique direction, the width of the rounded portion of the magnetic film can be reduced at the track edge on the side where side erase occurs, and the magnetic head in which side erase during recording is prevented can be easily performed. Can be manufactured.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. Hereinafter, a magnetic head 1 as shown in FIG. 1 will be described as a magnetic head to which the present invention is applied.

As shown in FIG. 1, the magnetic head 1 has a pair of magnetic core halves 2 and 3 butted together on a butted surface to be joined and integrated. The pair of magnetic core halves 2 and 3 include a ferrite substrate 4 as an auxiliary core material, and a metal magnetic film 5 as a main core material formed on the ferrite substrate 4.
The low melting point glass 6 is formed on the ferrite substrate 4 so as to cover the metal magnetic film 5. In the magnetic head 1, a pair of magnetic core halves 2 and 3 are joined via a nonmagnetic thin film 7 at the butting surfaces. Then, on the sliding surface 1a on which the magnetic tape slides, a magnetic gap is formed by the metal magnetic films 5 abutting each other via the non-magnetic thin film 7.

The width of the magnetic gap is regulated by the ferrite substrate 4 being cut off in the depth direction from the abutting surface at both ends. In the magnetic head 1, the notched portion of the ferrite substrate 4 is filled with the low-melting glass 6 and is flattened at the abutting surface. As shown in FIG. 2, the magnetic head 1 includes a magnetic surface 5 formed of a pair of magnetic core halves 2 and 3 and a metal magnetic film 5 on a ferrite substrate 4 at a portion where a magnetic gap is formed. The film surface S2 is substantially parallel. FIG. 2 is a plan view of the sliding surface 1 a of the magnetic head 1.

In the magnetic head 1, contact width regulating grooves 1b for regulating the contact width with the magnetic tape are formed on both sides of the sliding surface 1a. Further, the magnetic head 1
A winding window 1c is formed at the center of the abutting surfaces of the pair of magnetic core halves 2 and 3, and the low melting point glass 6 is filled up to the magnetic gap side of the winding window 1c. That is, the pair of magnetic core halves 2 and 3 are joined by the low melting point glass 6. The magnetic head 1 has a sliding surface 1.
A winding auxiliary groove 1d is formed at a position which is approximately the same height as the winding window 1c at both ends of "a". A coil (not shown) is wound around the winding window 1c and the winding auxiliary groove 1d.

That is, in the magnetic head 1 configured as described above, a magnetic core is formed by the ferrite substrate 4 and the metal magnetic film 5, and a current is supplied to a coil wound around the magnetic core. By doing
A magnetic field is generated from the magnetic gap on the sliding surface 1a to record a magnetic signal on a magnetic tape. When reproducing a magnetic signal recorded on a magnetic tape, a magnetic signal is detected by a magnetic gap, and a current wound in accordance with the detected magnetic signal is detected by a coil wound around a magnetic core.

In the magnetic head 1, as shown in FIG. 3, the edge positions P1 and P2 of the metal magnetic film 5 formed on the ferrite substrate 4 are different from the edge positions P3 and P4 of the ferrite substrate 4. , Are formed to be shifted by a predetermined amount in a predetermined direction. Specifically, for example, FIG.
As shown in the figure, the edge positions P1, P2 of the metal magnetic film 5
Are formed with respect to the edge positions P3 and P4 of the ferrite substrate 4 by a shift amount L1 in the clockwise direction as viewed from the sliding surface 1a side. FIG. 3 is an enlarged schematic view showing the ferrite substrate 4 and the metal magnetic film 5 as viewed from the sliding surface 1a.
Only one of them is shown.

In the magnetic head 1 to which the present invention is applied, the edge position of the metal magnetic film 5 is shifted from the edge position of the ferrite substrate 4 as described above.
It is possible to offset the interface between the metal magnetic film 4 where the pseudo gap is easily formed and the ferrite substrate 4 from the recording track, and to reduce the influence of the pseudo gap to improve the recording / reproducing characteristics. It is possible.

Hereinafter, effects of the present invention will be described with reference to schematic diagrams. That is, as shown in FIG. 4, when azimuth recording is performed by a so-called parallel film MIG head having a metal magnetic film 5 formed on a ferrite substrate 4, an interface between the ferrite substrate 4 and the metal magnetic film 5 is formed. A pseudo gap occurs in S1. As a result, for example, when the reproduction is performed by moving the parallel film MIG head in the direction indicated by the arrow A in FIG.
Of the pseudo gaps generated in step (1), a portion of the region L2 overlapping the magnetic gap S2 is also detected, and swell (ripple) occurs in the output during reproduction. The influence of the pseudo gap becomes more remarkable as the magnetic signal to be recorded becomes smaller as the recording density increases. In the pseudo gap, a portion of the region L3 that does not overlap the recording track detected by the magnetic gap S2 has a small influence of the pseudo gap because the azimuth angles in the adjacent recording tracks are different.

Therefore, in the magnetic head 1 according to the present invention,
As shown in FIG. 5, by shifting the edge positions P1 and P2 of the metal magnetic film 5 forming the magnetic gap S2 with respect to the edge positions P3 and P4 of the ferrite substrate 4, respectively, the ferrite substrate 4 and the metal magnetic film Interface S with 5
1, the portion of the region L2 overlapping the recording track detected by the magnetic gap S2 can be reduced. Thereby, the magnetic head 1 can reduce the ripple generated in the reproduction output.

In the magnetic head 1, it is desirable that the edge positions P1 and P2 of the metal magnetic film 5 are shifted from the edge positions P3 and P4 of the ferrite substrate 4 in the same direction as the azimuth angle. As a result, as shown in FIG. 6, the width of the recording track is W, the azimuth angle is θ2, and the deviation angle between the edge positions P1, P2 and the edge positions P3, P4 is θ.
3. When the thickness of the metal magnetic film 5 is h, the offset amount wf of the edge position P3 of the ferrite substrate 4 is expressed by the following equation 1. A region L2 affected by the pseudo gap is represented by the following expression (2).

Wf = h · sin (θ2 + θ3) (Equation 1) L2 = W−wf = W−h · sin (θ2 + θ3) (Equation 2) Accordingly, the azimuth angle θ2 and the deviation angle of the edge position θ3
, The offset amount wf can be increased, and the area L2 can be reduced.

Conversely, the edge positions P1, P of the metal magnetic film 5
7 is shifted in a direction different from the azimuth angle with respect to the edge positions P3 and P4 of the ferrite substrate 4, FIG.
As shown in the above, the offset amount wf of the edge position P3 of the ferrite substrate 4 is expressed by the following expression 3. A region L2 in which the influence of the pseudo gap occurs is represented by the following Expression 4.

Wf = h · | sin (θ2−θ3) | (Expression 3) L2 = W−wf = Wh · | sin (θ2−θ3) | (Expression 4) In this case, the offset amount wf is determined according to the difference between the azimuth angle θ2 and the deviation angle θ3 of the edge position. You have to make it bigger.

In the magnetic head 1, a pair of magnetic core halves 2 and 3 are abutted against each other with the metal magnetic films 5 shifted from each other, and edge positions P1 and P2 of the metal magnetic film 5 in the magnetic gap. Are desirably formed in the same direction as the shift directions of the metal magnetic films 5 with respect to the edge positions P3 and P4 of the ferrite substrate 4. The magnetic head 1 includes a pair of magnetic core halves 2 and 3
Since the metal magnetic films 5 are abutted with the metal magnetic films 5 shifted from each other, as described with reference to FIGS. 21 and 22, it is possible to reduce the crosstalk from the adjacent recording tracks during the reproducing operation. At this time, the edge positions P1 and P2 of the metal magnetic film 5 further deviate from the edge positions P3 and P4 of the ferrite substrate 4 in the same direction as the direction in which the metal magnetic films 5 deviate. In this case, the area L2 in which the influence of the light is generated can be reduced.

Incidentally, in the magnetic head 1, when the pair of magnetic core halves 2 and 3 are butted with the metal magnetic films 5 shifted as described above, it is necessary to consider the influence of the side erase phenomenon. . In the following, a description will be given of results obtained by the present inventor regarding this point.

In the magnetic head 1 in which the metal magnetic films 5 are staggered against each other, the magnitude of the magnetic field required for the side erase generated at the end of the magnetic gap is shown in FIG.
As schematically shown in FIG. 3, it is considered that the distance depends on the distance x between the magnetic core and the magnetic core. FIG. 8 is an enlarged schematic view showing the vicinity of the end of the magnetic gap in the magnetic head 1, in which the ferrite substrate 5 and the nonmagnetic thin film 7 are omitted.

As a result of study, the present inventor has found that the distance c between the end position P5 of the rounded portion at the end of the metal magnetic film 5 and the metal magnetic film 5 facing the metal magnetic film 5 is equal to the side erase. Is smaller than the distance x that affects
The width y at which the side erase occurs is the slope a of the slope of the metal magnetic film 5 and the distance b in the track width direction from the edge position (end position of the flat portion) P1 of the metal magnetic film 5 to the end position P5 of the rounded portion. It has been found that a first-order approximation can be made as shown in the following Expression 5 using

Y = ax + b (Equation 5) Therefore, in the magnetic head 1, in order to reduce the influence of side erasure, the end position P5 of the rounded portion at the end of the metal magnetic film 5 is set to It is considered effective to reduce the distance b by approaching the edge position P1 of the film 5.

In the magnetic head 1, as shown in FIG.
When the edge positions P1 and P2 of the metal magnetic film 5 are shifted from the edge positions P3 and P4 of the ferrite substrate 4, sputtering is performed in an oblique direction as described later, so that the rounded portion on the edge position P1 side is formed. Can be smaller. As a result, the distance b between the edge position P1 and the end position P5 of the round portion can be reduced, and the influence of the side erase phenomenon at the time of recording can be reduced.

That is, in the magnetic head 1, the metal magnetic films 5 of the pair of magnetic core halves 2 and 3 are shifted and butted to reduce crosstalk from adjacent recording tracks during reproduction. However, the direction of displacement between the metal magnetic films 5 is determined by the edge position P of the metal magnetic film 5.
1 and the edge direction P3 of the ferrite substrate 4 are set in the same direction as the shift direction, so that the influence of the side erase phenomenon can be reduced.

Next, a method for manufacturing the magnetic head 1 described above will be described in detail with reference to the drawings. When manufacturing the magnetic head 1, first, a plurality of magnetic core halves 2 and 3 are formed on the same substrate. Then, the magnetic head 1 is completed by bonding a pair of the substrates and separating the substrates into individual magnetic heads 1.

First, as shown in FIG. 9, a substantially flat substrate 20 is prepared. The substrate 20 is to be the ferrite substrate 4 of the magnetic head 1 and has a thickness of, for example, 2 mm.
And the length and width are about 30 mm. The substrate 20 is made of, for example, Mn—Zn single crystal ferrite, Ni
-It may be formed of a material such as Zn ferrite. Further, a polycrystalline ferrite material may be used, or a substrate material in which a single crystal ferrite material and a polycrystalline ferrite material are joined may be used. Further, in order to facilitate alignment of each part in a later step,
The positioning notch 20a may be formed.

Next, as shown in FIG. 10, a glass groove 21 and a winding groove 22 are formed on the substrate 20. The winding groove 22 is finally connected to the winding window 1 c of the magnetic head 1.
It is what becomes.

Next, as shown in FIG. 11, a track width regulating groove 23 is formed on the substrate 20 in a direction perpendicular to the glass groove 21 and the winding groove 22 by using a slicer or the like. The track width regulating groove 23 finally serves as a groove for filling the low melting point glass 6 in the magnetic head 1 and serves as an inclined surface of the ferrite substrate 4 for regulating the width of the magnetic gap. After the track width regulating groove 23 is formed, the surface of the substrate 20 is subjected to mirror polishing, and the substrate 20 is cut in the direction in which the glass groove 21 and the winding groove 22 are formed as shown in FIG. Thus, a pair of magnetic core half blocks 24 is formed.

Next, a metal magnetic film 5 is formed on the magnetic core half block 24 by sputtering in an oblique direction. At this time, for example, as shown in FIG. 12, by tilting the magnetic core half block 24 with respect to the magnetic material target 25, sputtering can be performed in an oblique direction. As shown in FIG. 13, a mask plate 26 having an opening 26a at a predetermined position is provided.
The magnetic core half block 24 and the magnetic material target 25
And sputtering may be performed in an oblique direction through the opening 26a.

According to the present invention, by sputtering the magnetic core half block 24 in the oblique direction as described above, a predetermined position with respect to the edge position of the ferrite substrate 4 is determined at the position corresponding to the magnetic gap of the magnetic head 1. The metal magnetic film 5 can be formed by shifting the edge position by a predetermined amount in the direction of. As a result, the width b in the track direction of the round portion at the edge position P1 of the metal magnetic film 5 can be reduced. Therefore, according to the present invention, when manufacturing the magnetic head 1 with improved recording / reproducing characteristics, no special device is required and the number of manufacturing steps is not increased, so that the manufacturing can be performed at extremely low cost.

The edge position P1 of the ferrite substrate 4
Of the edge position P3 of the metal magnetic film 5 with respect to
Is preferably 5 ° to 45 °. If the shift angle θ3 is less than 5 °, the effect of the present invention cannot be sufficiently obtained, and it is difficult to form the metal magnetic film 5 with high accuracy so that θ3 exceeds 45 °.

As a material for forming the metal magnetic film 5, for example, an Fe-Ru-Ga-Si alloy (SMX alloy), sendust, or the like can be used. Further, oxygen or nitrogen may be added to these SMX alloys or sendust to form them. Alternatively, they may be formed as various crystalline magnetic films, Fe-based microcrystalline films, and Co-based microcrystalline films.

Before the metal magnetic film 5 is formed, a base film may be formed to improve the adhesion between the metal magnetic film 5 and the ferrite substrate 4. As the base film, for example, an oxide material such as SiO ₂ or Ta ₂ O ₅ ,
A nitride material such as i ₃ N ₄ , a metal material such as Cr, Al, Si, and Pt, or an alloy material of these metals can be used. Further, these materials may be stacked and used.

Next, a non-magnetic thin film 7 is formed on the metal magnetic film 5 exposed on the main surface of the substrate 20. The non-magnetic thin film 7
For example, a single-layer film of SiO ₂ may be used. Further, as a reaction prevention film with the low melting point glass 6 to be filled in a later step,
For example, a Cr film or the like may be formed on the nonmagnetic thin film 7.

Next, as shown in FIG.
The magnetic core half block 24 formed with is formed and joined together to form a magnetic core block 27. At this time, the glass groove 21 and the winding groove 22 are filled with the low-melting glass 6,
5 while pressing the pair of magnetic core half blocks 24 together.
By heating to 00 ° C. to 800 ° C., the pair of magnetic core half blocks 24 are joined.

At this time, it is preferable that the metal magnetic films 5 formed on the pair of magnetic core half-blocks 24 are joined while being shifted. The shift amount at this time is, for example, 0.
It is about 5 μm to 2 μm.

Next, as shown in FIG. 15, cylindrical polishing is performed on the surface of the magnetic core block 27 where the abutting surfaces of the metal magnetic films 5 are exposed. As a result, this surface becomes the sliding surface 1a of the magnetic head 1.
Further, winding auxiliary grooves 28 are formed at both ends of the sliding surface 1a. The winding auxiliary groove 28 is finally
In the auxiliary winding groove 1d.

Next, as shown in FIG. 16, a contact width regulating groove 1b is formed in the magnetic core block 27, and the magnetic head 1 is cut by cutting the individual magnetic heads 1. At this time, the direction in which the contact width regulating groove 1b is formed, and the direction in which the individual magnetic heads 1 are cut, are
Is the direction having the desired azimuth angle. That is, the azimuth angle of the magnetic head 1 is determined by the direction in which the contact width regulating groove 1b is formed and the direction in which the individual magnetic heads 1 are cut. The azimuth angle is, for example, ± 20 °
It should be about the degree.

The magnetic head 1 is completed as described above.

[0055]

As described above, in the magnetic head according to the present invention, since the edge position of the magnetic film is shifted from the edge position of the substrate, the magnetic film and the substrate are likely to form a pseudo gap. Can be offset from the recording track. Therefore, the influence of the pseudo gap can be reduced, and the reproduction characteristics can be improved. Further, in the magnetic head according to the present invention, even when the pair of magnetic core halves are shifted from each other on the abutting surface to abut against each other for the purpose of reducing crosstalk at the time of reproduction, the magnetic films are not attached to each other. By making the direction of the shift and the direction of the shift between the edge position of the magnetic film and the edge position of the substrate the same, it is possible to reduce the side erase during recording. Therefore, the magnetic head according to the present invention can ensure good recording / reproducing characteristics even when the track width is narrowed in order to cope with higher recording density.

Further, according to the method of manufacturing a magnetic head of the present invention, the effect of the pseudo gap is reduced by only performing sputtering in an oblique direction with respect to the substrate to manufacture a magnetic head having improved recording / reproducing characteristics. can do. That is, it is possible to manufacture a magnetic head exhibiting good recording / reproducing characteristics at low cost without going through a complicated process.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a magnetic head to which the present invention is applied.

FIG. 2 is an enlarged plan view of a main part, showing the vicinity of a magnetic gap of the magnetic head in an enlarged manner.

FIG. 3 is a schematic view illustrating a laminated structure of a ferrite substrate and a metal magnetic film in the magnetic head.

FIG. 4 is a diagram for explaining an effect of a pseudo gap reduced by the magnetic head, and is a schematic diagram showing a case where the present invention is not applied.

FIG. 5 is a diagram for explaining an effect of a pseudo gap reduced by the magnetic head, and is a schematic diagram showing a case where the present invention is applied.

FIG. 6 is a view for explaining an offset amount from a recording track of an edge position of a metal magnetic film in the magnetic head.

FIG. 7 is a diagram for explaining an offset amount of a position of an edge of a metal magnetic film from a recording track in the magnetic head.

FIG. 8 is a schematic diagram used to explain a side erase amount at an edge position of a metal magnetic film in the magnetic head.

FIG. 9 is a view for explaining the method for manufacturing the magnetic head, and is a perspective view showing the substrate.

FIG. 10 is a diagram for explaining the method for manufacturing the magnetic head, and is a perspective view showing a state where a glass groove and a winding groove are formed on the substrate.

FIG. 11 is a diagram for explaining the method for manufacturing the magnetic head, and is a perspective view showing a state where a track width regulating groove is formed.

FIG. 12 is a diagram for explaining the method for manufacturing the magnetic head, and is a diagram illustrating an example in which a metal magnetic film is obliquely sputtered on a substrate.

FIG. 13 is a diagram for explaining the method of manufacturing the magnetic head, and is a diagram illustrating another example in which a metal magnetic film is obliquely sputtered on a substrate.

FIG. 14 is a diagram for explaining the method for manufacturing the magnetic head, and is a perspective view showing a state where the magnetic core blocks are formed by joining the magnetic core half blocks.

FIG. 15 is a view for explaining the method for manufacturing the magnetic head, and is a perspective view showing a state in which the magnetic core block is subjected to cylindrical polishing to form the winding auxiliary groove 28.

FIG. 16 is a view for explaining the method for manufacturing the same magnetic head, and is a perspective view showing a state where the magnetic core block is cut into individual magnetic heads.

FIG. 17 is a view showing an example of a conventional laminated head.
It is the schematic which expands and shows the magnetic gap vicinity.

FIG. 18 is a diagram showing an example of a conventional TSS head;
It is the schematic which expands and shows the magnetic gap vicinity.

FIG. 19 is a diagram showing an example of a conventional parallel film MIG head, and is a schematic diagram showing an enlarged view of the vicinity of a magnetic gap.

FIG. 20 is a diagram showing another example of the conventional parallel film MIG head, and is a schematic diagram showing the vicinity of a magnetic gap in an enlarged manner.

FIG. 21 is a schematic diagram used to explain the relationship between the direction of displacement between metal magnetic films and crosstalk in a conventional parallel film MIG head.

FIG. 22 is a schematic view used to explain the relationship between the direction of displacement between metal magnetic films and crosstalk in a conventional parallel film MIG head.

FIG. 23 is a diagram showing an example of a conventional magnetic head in which side erase is reduced, and is a schematic diagram showing an enlarged view of the vicinity of a magnetic gap.

FIG. 24 is a diagram showing another example of a conventional magnetic head in which side erase is reduced, and is a schematic diagram showing an enlarged view of the vicinity of a magnetic gap.

FIG. 25 is a diagram showing still another example of a conventional magnetic head in which side erase is reduced, and is a schematic diagram showing an enlarged view of the vicinity of a magnetic gap.

[Explanation of symbols]

1 magnetic head, 2, 3 magnetic core half, 4 ferrite substrate, 5 metal magnetic film, 6 low melting point glass, 7 non-magnetic thin film

Claims (6)

[Claims] 1. A magnetic gap formed by a pair of magnetic core halves each having a magnetic film formed on a substrate abutting each other via a non-magnetic film at abutting surfaces parallel to a film forming surface of the magnetic film. Wherein the magnetic gap is formed by cutting the substrate at both ends in the depth direction from the abutting surface.
A magnetic head, wherein the width is regulated, and in the magnetic gap, an edge position of the magnetic film is shifted from an edge position of the substrate by a predetermined amount in a predetermined direction. 2. The magnetic gap according to claim 1, wherein the edge position of the magnetic film is shifted in the same direction as the azimuth angle with respect to the edge position of the substrate.
The magnetic head as described. 3. The pair of magnetic core halves are butted against each other on the butting surface so that the magnetic films are shifted from each other. In the magnetic gap, the edge position of the magnetic film is set at the edge position of the substrate. 2. The magnetic head according to claim 1, wherein the magnetic films are shifted in the same direction as the shift directions of the magnetic films. 4. A magnetic gap is formed by abutting a pair of magnetic core halves, each having a magnetic film formed on a substrate, at a butting surface parallel to a film forming surface of the magnetic film via a non-magnetic film. Forming a track width regulating groove for regulating the width of the magnetic gap in the substrate, and performing sputtering in an oblique direction with respect to the substrate, A step of shifting the edge position by a predetermined amount in a predetermined direction with respect to the edge position of the substrate in a portion to be a magnetic gap to form the magnetic film. Production method. 5. The method of manufacturing a magnetic head according to claim 4, wherein in the film forming step, sputtering is performed in an oblique direction by tilting the substrate with respect to a magnetic material target. 6. In the film forming step, a mask plate having an opening at a predetermined position is disposed between the substrate and the magnetic material target, and sputtering is performed obliquely through the opening. The method for manufacturing a magnetic head according to claim 4.