JPS6139907A - Magnetic head - Google Patents

Abstract

PURPOSE:To realize a head having an excellent magnetic characteristic by increasing the total thickness of the magnetic thin film of a core half having a titled base to a gap face to be larger than the width at the tip of a magnetic thin film corresponding to the track width. CONSTITUTION:A side face 7 of two core halves 9, 10 opposing a gap face is tilted to the gap face and the magnetic thin film 4 is formed to the side face 7. Then the total thickness of the magnetic thin film 4, that is, T1+T3, is set to be larger than the width TW at the tip of the magnetic thin film 4 corresponding to the track width. Thus, the magnetic saturation of the magnetic thin film at a part from the magnetic gap before the saturation of a magnetic flux density of the magnetic gap occurred conventionally is avoided and the head with excellent magnetic characteristic enhancing sufficiently the effect of the magnetic thin film is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic rod, and in particular to a core base portion whose side surface facing a magnetic gap is inclined with respect to the magnetic gap surface, and Magnetism A/, L+--b of core base part
The present invention relates to a magnetic head having a core half including a magnetic thin film made of a magnetic material having a magnetic flux density.

[Conventional technology]

With the increase in the density of magnetic recording, the coercive force of magnetic recording media has been increased, and a magnetic head that can record on this magnetic recording medium is made of a magnetic material with a high saturation magnetic flux density, at least in the portion facing the magnetic gap. Development of magnetic heads is progressing.

As a result of various studies on this type of magnetic head, the present inventors first discovered a core base portion whose side surface facing the magnetic gap is inclined with respect to the magnetic gap surface, and a magnetic gap between the core base portion and the magnetic head. proposed a magnetic head using a core half with a magnetic thin film made of a magnetic material having a high saturation magnetic flux density and coated on the opposing side surface (Japanese Patent Application Laid-Open No.
8-155513).

This magnetic head consists of a core base portion whose side surface facing the magnetic gap is inclined in a chevron shape with respect to the magnetic gap surface, and a core base portion that is adhered to the side surface of the core base portion that faces the magnetic gap. Two core halves each having a magnetic thin film made of a magnetic material having a high pitch, a high pitch, a high pitch, and a magnetic thin film are combined with each other via a gap spacer.

Incidentally, in the case of this magnetic head, the thickness of the magnetic thin film is limited to 1/2 or less of the width of the tip of the magnetic thin film corresponding to the track width. As a result, the magnetic thin film in a portion away from the magnetic gap portion saturates before the magnetic flux density in the magnetic gap portion saturates, and there is a drawback that the features of the magnetic head with this configuration cannot be fully demonstrated.

[Problem that the invention seeks to solve]

The object of the present invention is to overcome these drawbacks of the prior art and provide a long-life magnetic head with excellent magnetic properties.

A magnetic head consisting of two core bodies joined through a gap, wherein the core half has a core base part whose side surface facing the magnetic gap is inclined with respect to the magnetic gap surface, and the core base part. A magnetic thin film made of a magnetic material having a high saturation magnetic flux density is deposited on the side surface facing the magnetic gap of the part, and the total thickness of the magnetic thin film corresponds to the track width. It is characterized by being larger than the width of the tip of the magnetic thin film.

〔Example〕

Next, a first embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a plan view of a magnetic head according to a first embodiment, and FIG. 2 is a side view of the magnetic head.

In the case of this magnetic head 1, the side surface 7 facing the gap spacer 2 forming a magnetic gap between the two core base portions 3 made of high magnetic permeability ferrite such as manganese-zinc ferrite or nickel-zinc ferrite is the gap spacer 2. It is inclined linearly from both sides so that the center is pointed in the shape of a mountain with respect to the side surface 8 (magnetic gap surface).

A magnetic thin film 4 is formed on this side surface 7 by appropriate means such as sputtering or direct deposition. Examples of materials for the magnetic thin film 4 include iron-silicon alloy and iron-aluminum-silicon alloy.

A metallic magnetic material, such as a nickel-iron alloy or an amorphous alloy, is used, which has a higher saturation magnetic flux density than the ferrite, high magnetic permeability, and magnetostriction near zero. As shown in Figure 1,
Magnetic thin layers provided on both sides of one core half
The total thickness of I4, i.e. TI (approximately 70μ) + 72.
(approximately 70μ) (=2.T (approximately 140μ)) is the width TV (approximately 120μ) of the tip of the magnetic thin film 4, which corresponds to the track width.
), preferably 2T/TW is larger than 1.
1. The magnetic thin film 4 is formed so that the magnetic field is in the range of 1.6 to 1.6.

The tips of the magnetic thin films 4 are joined together via a gap spacer 2, and reinforcing portions 6 made of a non-magnetic material such as glass are provided on both sides of the gap spacer 2.

In FIG. 2, reference numeral 9.10 indicates core halves, and one core half 10 is formed with a coil groove 5 for winding an excitation coil (not shown), and both core halves 9, 10 are integrated with a thin film gap spacer 2 interposed therebetween.

This self-recording head is used in a magnetic disk recording/reproducing device in combination with an erasing spatula (1C).

FIG. 2 is a plan view of a magnetic head according to a second embodiment of Kinoto Yn. This embodiment is different from the previous embodiment in that the tip of the core base portion 3 is not in the center but on one side. 2. Therefore, there is only one side surface 7 facing the magnetic gap, and the magnetic thin film 4 is formed on that side surface 7. Therefore, in this case, the total thickness of the magnetic thin film 4 is the thickness T of one layer, which is the thickness of the magnetic thin film 4.
The width TW is larger than the width TW of the tip.

〔Effect of the invention〕

Since the present invention has the above-mentioned configuration, even if a high recording level occurs, the magnetic thin film in the portion away from the magnetic gap will be reduced earlier than the magnetic flux density in the magnetic gap becomes saturated as in the conventional case. It has excellent magnetic properties such as no magnetic saturation, the effect of providing a magnetic thin film with high saturation magnetic flux density on the surface of the core base, low eddy current loss, and small contour effect. At the same time, it is possible to provide a long-life magneto-magnetic head in which magnetic saturation is less likely to occur.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a magnetic head according to a first embodiment of the invention, FIG. 2 is a side view of the magnetic head, and FIG. 3 is a plan view of a magnetic head according to a second embodiment of the invention. . DESCRIPTION OF SYMBOLS 1... Magnetic head, 2... Gap spacer, 3... Core base part, 4... Magnetic thin film, 7... Core base body. side of section, 8...
...Side side of gap spacer. 9.10... Core half, T, TI, T2...
...thickness of the magnetic thin film, TW...width of the tip of the magnetic thin film. Agent Patent Attorney Takeshi Junjibuki Figures 1A and 2

Claims (1)

[Claims] A magnetic head is formed by joining two core halves through a magnetic gap. A magnetic thin film made of a magnetic material having a high saturation magnetic flux density is deposited on the side surface facing the magnetic gap of the core base portion, and the total thickness of the magnetic thin film of the one core half is , a magnetic head characterized in that the width is larger than the width of the tip of the magnetic thin film corresponding to the track width.