JPH05298612A - Magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To easily provide a magnetic head which has a narrow track with high precision without increasing the machining precision at the time of the abutting of head core half bodies. CONSTITUTION:On nonmagnetic substrates 11a and 11b of one side, soft magnetic materials such as 'Sendust(R)' are laminated to thickness larger than specific track width to form laminate films 12a and 12b respectively. The thickness of the laminate films is set in consideration of the abutting machining precision, i.e., the quantity of abutting deviation. Those laminate films 12a and 12b are sandwiched by nonmagnetic substrates 13a and 13b of the other side respectively to form the head core half bodies 1a and 1b, which are made to abut on each other, thereby forming a magnetic gap 14. Then the magnetic part where deviation is generated is irradiated with FIB and machined areas 15 and 16 are formed so that the thickness of the laminate films 12a and 12b at the magnetic gap part which performs recording and reproduction by abutting on a magnetic tape reaches the specific track width.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head applied to a magnetic recording / reproducing apparatus and a method for manufacturing the same, and more particularly to a magnetic head having a laminated film structure for performing high density recording / reproducing with a narrow track width and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing a conventional magnetic head of this type, showing a magnetic tape sliding surface in the vicinity of a magnetic gap.

First, a laminated film 32a, 32b is formed on one of the non-magnetic substrates 31a, 31b by laminating a soft magnetic material such as sendust to a predetermined track width thickness W1 by a process such as sputtering. This laminated film 32
The head core halves 3a and 3b are formed by sandwiching a and 32b between the other non-magnetic substrates 33a and 33b. The head core halves 3a and 3b are butted to form a magnetic gap 34.

[0004]

In the above-described conventional magnetic head and manufacturing method thereof, the laminated films 32a and 32b are laminated to have a predetermined track width. Therefore, when the track width is narrowed for high density recording, the magnetic resistance increases and the recording / reproducing efficiency decreases.

When the two head core halves 3a and 3b are butted against each other, a deviation ΔW is generated along the magnetic gap. Therefore, there is a problem that the effective track width W2 becomes narrower than the predetermined track width W1, the magnetic resistance increases, and the recording / reproducing efficiency decreases. The influence of this misalignment becomes more remarkable as the track becomes narrower.
Even if the deviation amount is 1 μm, the predetermined track width is 10 μm.
In the case of m, the effective track width is reduced by 10%. Therefore, it is important to reduce the shift amount as the track becomes narrower.

By the way, in order to cope with high density recording, it is necessary to set the track width to 10 μm or less.
For this reason, it is necessary to increase the accuracy in the butt machining, and therefore, not only a highly accurate machining device and measuring device are required, but also a long time is required for the machining and the cost becomes high. In the portion where the butt displacement occurs, materials having different hardness such as a laminated film of a soft magnetic material and a non-magnetic substrate are present, and a step is generated due to a difference in the degree of wear of the magnetic tape, and the magnetic tape is scratched, or the head is damaged. There is a problem that the side is damaged. An object of the present invention is to provide a magnetic head capable of realizing a narrow track magnetic head with high accuracy and easily without lowering the recording / reproducing efficiency and without increasing the processing accuracy when the head core halves are butted, and a method for manufacturing the same. To provide.

[0007]

The magnetic head of the present invention comprises:
What is claimed is: 1. A magnetic head comprising two head core halves sandwiching a soft magnetic laminated film sandwiched by a non-magnetic substrate from above and below to form a magnetic gap, the soft magnetic laminated film sandwiched by the non-magnetic substrate. Is formed thicker than a predetermined track width, and is machined so that the thickness of the soft magnetic material laminated film in the magnetic gap portion which comes into contact with a magnetic medium for recording and reproduction has a predetermined track width. . A method of manufacturing a magnetic head according to the present invention comprises a step of forming a soft magnetic material laminated film by laminating a soft magnetic material on one non-magnetic substrate to a thickness of a predetermined track width or more, and the soft magnetic material laminated film. Sandwiching the other non-magnetic substrate to form the head core half body, abutting the head core half bodies to form the magnetic gap, and a soft magnetic material lamination of the magnetic gap portion abutting the magnetic medium. And a step of processing by convergent ion beam irradiation so that the film thickness becomes a predetermined track width. Further, instead of the step of processing by the focused ion beam irradiation, a step of cutting a groove may be replaced.

[0008]

The present invention will be described below with reference to the drawings.

1A and 1B are views showing a first embodiment of the present invention. FIG. 1A is a perspective view and FIG. 1B is a view showing a magnetic tape sliding surface near a magnetic gap.

First, a laminated film 12a, 12b is formed on one of the non-magnetic substrates 11a, 11b by laminating a soft magnetic material such as sendust to a thickness not less than a predetermined track width by a process such as sputtering. The thickness of the laminated film is set in consideration of the butting processing accuracy, that is, the butt shift amount.

Next, the laminated films 12a and 12b are sandwiched between the other non-magnetic substrates 13a and 13b to form head core halves 1a and 1b, and the head core halves 1a and 1b are abutted against each other to form a magnetic gap. 14 is formed. Next, the FIB (Focuse) is applied to the magnetic gap portion that is displaced along the magnetic gap 14.
d Ion Beam) and the surface is scraped off to form the processing areas 15 and 16. In this case, the processing area 15,1
The depth of 6 is set so as not to affect the recording / reproducing characteristics of the magnetic head, and the thicknesses of the laminated films 12a and 12b in the magnetic gap portion where the magnetic tape contacts to perform recording / reproducing have a predetermined track width. To process.

By doing so, it is possible to remove the butt displacement generated in the magnetic gap portion and to form a narrow track magnetic head.

2A and 2B are views showing a second embodiment of the present invention. FIG. 2A is a perspective view, and FIG. 2B is a view showing a magnetic tape sliding surface near a magnetic gap.

First, the head core halves 2a and 2b are formed in the same manner as in the first embodiment, and the head core halves 2a and 2b are formed.
The magnetic gaps 24 are formed by abutting 2b. Next, with respect to the magnetic gap portion in which the deviation has occurred, the grooves 25 and 26 are cut obliquely along the magnetic gap using a dicer or the like. In this case, the depths of the grooves 25 and 26 are set so as not to affect the recording / reproducing characteristics of the magnetic head, and the thicknesses of the laminated films 22a and 22b in the magnetic gap portions where the magnetic tape contacts to perform recording / reproduction are predetermined. Process so that the track width becomes. The cut grooves 25 and 26 are filled with glass or the like.

By doing so, it is possible to eliminate the butt displacement generated in the magnetic gap portion and to form a narrow track magnetic head.

In this embodiment, an FIB or a dicer is used to process the thickness of the laminated film in the magnetic gap portion with which the magnetic tape comes into contact so as to have a predetermined track width. Other processing methods may be used as long as the conversion characteristics are not impaired. Further, the same effect can be obtained even if the processed shape is a triangle or a semicircle.

[0017]

As described above, according to the present invention, a head core half body is formed in which the thickness of the soft magnetic material laminated film sandwiched by the non-magnetic substrates is larger than a predetermined track width, and this head core half body is formed. After the magnetic gaps are formed by abutting each other, the thickness of the soft magnetic material laminated film in the magnetic gap portion abutting on the magnetic tape is machined using a FIB or a dicer so as to have a predetermined track width. It is possible to eliminate the butt displacement occurring in the gap portion, and it is possible to easily realize a narrow track magnetic head with high accuracy. Therefore, the magnetic resistance can be suppressed to be low, the recording / reproducing efficiency can be improved, and the magnetic tape and the magnetic head can be prevented from being damaged due to misalignment.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention, (a)
Is a perspective view, and (b) is a diagram showing a magnetic tape sliding surface near the magnetic gap.

FIG. 2 is a diagram showing a second embodiment of the present invention, (a)
Is a perspective view, and (b) is a diagram showing a magnetic tape sliding surface near the magnetic gap.

FIG. 3 is a diagram showing an example of a conventional magnetic head.

[Explanation of symbols]

 1a, 1b, 2a, 2b head core half body 11a, 11b, 13a, 13b non-magnetic substrate 12a, 12b, 22a, 22b laminated film 14, 24 magnetic gap 15, 16 working area 25, 26 groove

Claims (3)

[Claims] 1. A magnetic head in which two head core halves sandwiching a soft magnetic laminated film between non-magnetic substrates from above and below are butted against each other to form a magnetic gap,
The thickness of the soft magnetic material laminated film sandwiched by the non-magnetic substrate is formed to be thicker than a predetermined track width, and the thickness of the soft magnetic material laminated film in the magnetic gap portion for contact with a magnetic medium for recording and reproduction. Is machined to have a predetermined track width. 2. A step of forming a soft magnetic material laminated film by laminating a soft magnetic material on one non-magnetic substrate to a thickness equal to or larger than a predetermined track width, and the soft magnetic material laminated film on the other non-magnetic substrate. A step of forming the head core half by sandwiching it by a substrate, a step of forming the magnetic gap by butting the head core halves, and a thickness of the soft magnetic laminated film of the magnetic gap portion abutting the magnetic medium are predetermined. And a step of processing by converging ion beam irradiation so that the track width becomes. 3. The method of manufacturing a magnetic head according to claim 2, wherein a step of cutting a groove is substituted for the step of processing by the focused ion beam irradiation.