JPH05128433A - Magnetic head - Google Patents

Abstract

PURPOSE:To ameliorate the spacing loss by the spacing of a magnetic gap with a magnetic recording medium and to obtain higher outputs. CONSTITUTION:The magnetic gap forming part of a magnetic ferrite core 1 on a side 8 of its surface for opposite contact with the magnetic recording medium is formed of a magnetic metallic film 2 which is deposited in the gap depth direction of a magnetic gap g and is set with an axis of difficult magnetization h.a in the direction orthogonal with the magnetic gap forming surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, and more particularly, to a magnetic head in which at least a magnetic gap forming portion on a contact surface with a magnetic recording medium is formed of a metal magnetic film.

[0002]

2. Description of the Related Art A magnetic recording medium having a high coercive force is used because of a demand for higher recording density for the magnetic recording medium.

A recording magnetic head having a high saturation magnetic flux density Bs is required as a recording magnetic head for performing magnetic recording on this high coercive force magnetic recording medium.

As a recording magnetic head of this type, at least a portion forming a magnetic gap is constituted by a soft magnetic metal thin film having a high saturation magnetic flux density, for example, a so-called metal-in-gap type magnetic head. There has been proposed a head, or a so-called laminated magnetic head having a structure in which a soft magnetic metal thin film having a high saturation magnetic flux density is laminated on a magnetic gap forming portion.

FIG. 6 shows the basic structure of a magnetic head. In this magnetic head, a pair of core halves 11A and 11B face each other so that a magnetic gap g is formed between the front end faces thereof. Has been done. Reference numeral 12 designates a gap depth D of the magnetic gap g and a winding groove used for winding the head winding.

Now, in this configuration, the gap depth direction of the magnetic gap g is x, the track width direction of the magnetic gap g is y, and each direction x and the direction orthogonal to y, that is, the magnetic gap g is formed. Both core halves 11A and 1
In the metal-in-gap type magnetic head, when the direction orthogonal to the gap forming surface (the mutual abutting surface) of 1B is the z direction, both core halves 11A and 11
B having at least a gap forming surface that forms the magnetic gap g, that is, a film surface that extends along a surface including the x axis and the y axis (hereinafter referred to as an xy plane), and has a high B with the deposition direction in the z axis direction.
s soft magnetic metal film such as sendust, Co amorphous, or the like is formed by sputtering, vapor deposition, or the like.

Further, in the laminated type magnetic head,
A high Bs soft magnetic metal film is formed in a direction along a plane including the x axis and the z axis (hereinafter, referred to as xz plane), and the soft magnetic metal film is laminated in the y direction. In each of these magnetic heads, the core halves 11A and 11B are composed of a ferrite core having a high magnetic permeability. Since a ferrite core rich in iron and a metal magnetic layer with relatively low wear resistance are exposed to each other, the wear of the part with low wear resistance is severe compared to the other parts where the magnetic gap is formed. A recess in which the portion where the magnetic gap g is formed is recessed as compared with other portions is generated, which increases the distance to the magnetic recording medium, that is, the spacing d, and thus the spacing loss. That is, since this spacing loss L is given by L = 56.4 d / λ [dB] (λ is a recording wavelength), d = 100Å with λ = 0.5 μm now.
~ 500Å, the spacing loss L is 1d
It becomes B-5 dB.

Further, as described above, in the metal-in-gap type magnetic head in which the metal magnetic film is formed along the xy plane, the magnetic path including the magnetic path crossing the magnetic gap g is Since most of it is composed of ferrite, the effect of magnetic flux saturation in the ferrite part is large,
Further, since the ferrite is deteriorated and the film-forming direction is the z-axis direction, the film has a magnetic anisotropy μ in the direction perpendicular to the film surface, that is, the direction crossing the magnetic gap g due to the induced magnetic anisotropy. There is a problem such as low. Furthermore, there are problems of ripple and noise.

Further, in the case of a laminate type magnetic head having the above-mentioned y-direction as a stacking direction, since magnetic flux flows in all directions within the film surface, a magnetic field applied to the magnetic recording medium cannot always be sufficiently obtained. There is a problem that a sufficiently high output cannot be obtained.

[0010]

DISCLOSURE OF THE INVENTION The present invention provides a magnetic head capable of improving the spacing gloss and further increasing the output.

[0011]

According to the present invention, as shown in FIG. 1 which is a sectional view taken along a plane orthogonal to the gap forming surface of the magnetic gap g, the contact surface 8 of the magnetic ferrite core 1 with the magnetic recording medium is shown. The metal magnetic film 2 is deposited in the gap depth direction of the magnetic gap g, that is, in the x-axis direction, at least on the side where the magnetic gap g is formed, and the metal magnetic film 2 forms the gap forming surface of the magnetic gap g, that is, xy. The hard axis h · a is set in the z direction orthogonal to the plane.

[0012]

As described above, according to the structure of the present invention, the deposition direction of the metal magnetic film 2 forming the magnetic gap g is defined as the x direction along the gap depth of the magnetic gap g, and the hard axis h · a thereof is set. By selecting in the z direction which is the direction orthogonal to the gap forming surface of the magnetic gap g, this z
The magnetic permeability μ in the direction can be increased.

FIG. 2 shows the magnetic permeability μ with respect to the frequency f. Curves 21 and 23 in the figure respectively indicate the magnetic permeability in the hard axis direction and the easy axis direction in the metal magnetic film having magnetic anisotropy. The measurement result of magnetic susceptibility μ is shown in the curve 22.
In the case of an isotropic film, the curve 24 shows the magnetic permeability in the direction perpendicular to the film surface of the magnetic film.

As is apparent from FIG. 2, in the magnetic film 2 having the hard axis h · a in the z-axis direction according to the present invention, the magnetic permeability μ in the direction orthogonal to the magnetic gap forming surface is large. It turns out that Therefore, a high output magnetic head can be obtained.

Further, according to the present invention, the metal magnetic film 2 is provided.
Is the contact surface 8 of the magnetic ferrite core 1 with the magnetic recording medium.
By arranging it on the side, almost the entire area of the contact surface 8 with the magnetic recording medium can be constituted by the metal magnetic film 2. By doing so, the magnetic gap g forming portion and its surroundings can be formed. It is possible to suppress the occurrence of spacing loss due to an increase in spacing due to the difference in wear resistance between and.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to facilitate understanding of the magnetic head according to the present invention, an example of the present invention will be described in detail with reference to FIGS.

First, as shown in FIG. 3A, a magnetic ferrite core material 31 having high magnetic permeability is prepared, one main surface of which is a smooth surface, and a metal magnetic layer 32 having a high Bs is formed on the smooth surface.
By sputtering, vapor deposition, etc., for example, a film thickness of 100Å to 50
Form with 0Å. The metal magnetic layer 32 is made of, for example, sendust, Co amorphous, or FeGaS.
It is formed of an iRu alloy or the like.

The middle chain line a ₁ , a ₂ , a _{3 in} FIG. 3A.
As shown in FIG. 3, the core material 31 having the metal magnetic layer 32 is cut out into a required width to produce a plurality of core members 33A and 33B, respectively, as shown in FIG. 3B.

As shown in FIG. 4A, a position corresponding to the gap depth of the magnetic gap g of the magnetic head finally obtained from the surface of the metal magnetic layer 32 on at least one of the facing surfaces of the core members 33A and 33B. The winding groove 12 is cut into.

As shown in FIG. 4B, the track width regulating grooves 13 are cut in parallel with each other while maintaining a required space in the direction orthogonal to the winding groove 12.

Next, as shown in FIG. 5A, both core members 3
3A and 33B are joined and joined so that the end faces of the metal magnetic layer 32 between the track width regulating grooves 13 are aligned on the sides having the winding groove 12 and the track width regulating groove 13, respectively. In this case, although not shown, for example, by inserting a glass rod into the winding groove 12 and heating and melting the glass rod, the abutting surfaces of the core members 33A and 33B and the track width control groove 13 due to a capillary phenomenon.
The inside of the core member 3 is filled with the glass 14.
3A and 33B are fusion bonded and united.

Then, the united block 15 thus obtained crosses the extension direction of the winding groove 12 and the chain lines b ₁ , b ₂ , b ₃ ... which cross the track width regulating groove 13.
As shown in FIG. 5B by cutting along the plane indicated by, a core having a magnetic ferrite core 1 and a metal magnetic film 2 each of which is formed of a part of the core material 31 and the metal magnetic layer 32 described in FIG. 3A. The half bodies 16A and 16B are united to form a magnetic head core 17 having a magnetic gap g formed in the metal magnetic film 2 between the front end faces thereof.

Then, the front surface of the metal magnetic film 2 of the magnetic head core 17 thus obtained is polished to form the contact surface 8 with the magnetic recording medium as shown in FIG.
A magnetic head according to the present invention is constructed. That is, the metal magnetic film 2 is deposited in the gap depth direction of the magnetic gap g at least in the portion where the magnetic gap g is formed on the side of the surface 8 of the magnetic ferrite core 1 facing the magnetic recording medium. The magnetic head according to the present invention has the hard axis h · a in the z-axis direction, which is the direction orthogonal to the gap forming surface xy plane.

In the magnetic head according to the present invention having such a structure, since the contact surface 8 with the magnetic recording medium is formed by the metal magnetic film 2, the uneven wear due to the contact with the magnetic recording medium, that is, The occurrence of uneven wear is avoided,
This avoids the occurrence of spacing loss.

Further, since the hard axis of magnetization is set in the z direction orthogonal to the gap forming surface of the magnetic gap g, the magnetic permeability μ can be increased as described with reference to FIG. Higher output can be achieved by improving loss and improving the magnetic permeability μ.

[0026]

As described above, according to the configuration of the present invention,
The spacing loss with the magnetic recording medium can be improved and higher output can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an example of a magnetic head of the present invention.

FIG. 2 is a magnetic permeability-frequency characteristic curve diagram.

FIG. 3 is a manufacturing process diagram (1) of an example for obtaining the magnetic head according to the present invention.

FIG. 4 is a manufacturing process diagram (2) of an example for obtaining the magnetic head according to the present invention.

FIG. 5 is a manufacturing process diagram (3) of an example for obtaining the magnetic head according to the present invention.

FIG. 6 is a perspective view for explaining a conventional magnetic head.

[Explanation of symbols]

 1 magnetic ferrite core 2 metal magnetic film g magnetic gap 12 winding groove 13 track width regulating groove

Claims (1)

[Claims] 1. A metal magnetic film is deposited in the gap depth direction of the magnetic gap at least on a magnetic gap forming portion of the magnetic ferrite core on the surface facing the magnetic recording medium, and the metal magnetic film is the magnetic gap. 2. A magnetic head having a hard axis of magnetization set in a direction orthogonal to the gap forming surface.