JPH01276407A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the degradation of a magnetic characteristic of a magnetic film to be formed and to improve the electro-magnetic converting characteristic of a magnetic head by adhering the magnetic film of high permeability to the flat side surface of a core member to constitute the magnetic head. CONSTITUTION:A coil receiving channel 3 is graved to the side surface of a slider 1, which is composed of the Mn-Zn ferrite, etc., of the high permeability, in a width direction and an inner circumference part is adhered by a slider side magnetic cover film 4 of high saturating magnetic flux density such as cobalt system non-crystallizing alloy, etc. In the end face, to which the channel 3 of the slider 1 is graved, both edge parts of a core member 6, to which a core side magnetic film 5 of the high saturation magnetic flux density is adhered, are fixed on the flat side surface to face to the channel 3. Accordingly, since the magnetic films 4 and 5, which form the magnetic head to include a gap G, are connected with a magnetic flux to be generated by a coil, which is wound to the member 6, the degradation of the film is prevented and the magnetic head of the satisfactory electro-magnetic converting characteristic can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head, and particularly to a magnetic head provided with a magnetic film having a high saturation magnetic flux density.

[Conventional technology]

In order to increase the recording density, a magnetic head such as that disclosed in Japanese Patent Application Laid-open No. 14311/1983 is used as a magnetic head capable of recording and reproducing information on and from a magnetic disk whose recording surface is made of a magnetic material with high coercive force. A magnetic head including a magnetic film with a high saturation magnetic flux density has been proposed.

The outline is that a U-shaped winding section is attached to the end surface of a block-shaped slider section, and a magnetic film with high saturation magnetic flux density is applied to both the bent inner circumference of the winding section and the end surface of the slider. In addition to configuring the magnetic circuit and magnetic gap, the electromagnetic conversion characteristics of the magnetic circuit are improved by winding the magnet wire to configure the coil.
It aims to enable high-density recording on magnetic disks and the like.

[Problem to be solved by the invention]

However, in the conventional technology described above, although consideration is given to increasing the excitation force of the coil itself, there is no consideration given to the reduction in magnetic permeability caused by the shape of the magnetic film with high saturation magnetic flux density that constitutes the magnetic circuit. Not considered.

In other words, in the above-mentioned conventional technology, since the winding part has a U-shape, the inner peripheral surface of the winding part to which the magnetic film is applied is bent. If a magnetic film is formed on the inner circumferential surface of the subafuta particles, the magnetic permeability of the magnetic film deposited on the area tilted with respect to the incident direction of the subafuta particles will deteriorate, and the magnetic flux in the magnetic circuit formed by this magnetic film will deteriorate. There is a problem that the loss becomes large.

This becomes particularly noticeable when the self-sealing bond ratio of the magnetic film increases due to the miniaturization of the winding portion or the like.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent deterioration of the magnetic properties of a magnetic film that is adhered to a core member and constitutes a magnetic circuit.
The object of the present invention is to provide a magnetic head with excellent electromagnetic conversion characteristics.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means to solve the problem]

A brief description of typical aspects of the invention disclosed in this application is as follows.

In other words, a core member has a magnetic film adhered to one flat side surface, a winding receiving groove is carved on the side surface to which this core member is joined, and a slider and a core member stop together forming a magnetic circuit and a magnetic gap. The magnetic head is made up of:

[Effect]

According to the above-mentioned means, since the side surface of the core member to which the magnetic film is attached is flat, the magnetic properties of the magnetic film formed by sputtering, etc., do not deteriorate, and the magnetic thin film It is possible to improve electromagnetic conversion characteristics in a magnetic head that constitutes a part of the circuit.

[Embodiment 1] FIG. 1 is a perspective view showing the main parts of a magnetic head that is an embodiment of the present invention.

For example, in a block-shaped slider 1 made of Mn-Zn ferrite with high magnetic permeability, a plurality of floating rails 2 are protruded in parallel to each other on the bottom surface facing a magnetic disk (not shown). The magnetic disk is configured to generate lift by air currents formed on the surface of the magnetic disk.

In this case, a winding accommodating groove 3 is formed in the width direction on the side surface of the slider 1 at one end of the floating rail 2, and the inner circumference of this winding accommodating groove 3 is coated with, for example, a cobalt-based material. A slider side magnetic film 4 having a high saturation magnetic flux density made of an amorphous alloy or the like is deposited by sputtering or the like, and a portion thereof extends to the center of the end face of the slider 1.

Further, on the end face of the slider 1 where the winding accommodation groove 3 is carved, a core-side magnetic film 5 having a high saturation magnetic flux density is deposited on the flat side face facing the winding accommodation groove 3 by sputtering or the like. Both ends of the core member 6 are fixed.

The core-side magnetic film 5 on the upper end side of the core member 6 is connected to the slider-side magnetic film 4, and the core-side magnetic film 5, the slider-side magnetic film 4, and the like constitute a magnetic circuit.

A magnetic gap G is formed between the core-side magnetic film 5 and the slider-side magnetic film 4 at the lower end on the side of the floating rail 2 by interposing a non-magnetic thin film (not shown) such as silicon oxide. The size of the magnetic gap G is controlled by the thickness of the nonmagnetic thin film.

A part of a coil (not shown) formed by winding a conductor wire around the core member 6 can be accommodated in a winding housing groove 3 carved in the cross section of the slider 1, and, for example, when energizing this coil, A part of the magnetic flux formed in the magnetic circuit constituted by the slider-side magnetic film 4 and the core-side magnetic film 5 leaks out of the magnetic gap G and is formed by leakage magnetic flux (not shown), which causes information to be transmitted to a magnetic disk (not shown), etc. A recording operation is performed, and information is read from the storage medium using current generated in a coil when magnetic flux from the recording medium crosses a magnetic gap.

Here, when forming the slider side magnetic film 4 and the core side magnetic film 5 by sputtering as described above, the inclination angle θ of the film formation surface with respect to the incident direction of sputtered particles and the magnetic permeability μ of the thin film grown on the film formation surface are determined. For example, the relationship with JP-A-61-292211, JP-A-60-229
Publication No. 10, and IEICE Technical Research Report M
It is described in detail in R87-24 "Fe-Δβ-3i sputtered film for magnetic head", and its outline is shown in FIG. 5, for example.

That is, it is known that the magnetic permeability μ decreases in a sputtered film formed on a surface inclined with respect to the direction of incidence of sputtered particles, and the cause of this is, for example, as schematically shown in FIG. Differences occur in the growth direction of the thin film in the area A perpendicular to the direction of particle incidence and the inclined area C1, as well as in the tomb area of both, and as a result, each part of the sputtered film has magnetic anisotropy. It is thought that this is because of this.

For this reason, when the core member 6 is formed into a U-shape to form a window or the like for accommodating the winding wire as in the conventional case,
It is inevitable that a region having an inclination angle θ with respect to the incident direction of sputtered particles will occur, and the formed magnetic film will be in a bent state with respect to the magnetic flux return direction, resulting in poor magnetic properties such as magnetic permeability. However, in the case of this embodiment, the winding receiving groove 3 is formed on the slider 1 side, and the side surface of the core member 6 is made flat to form the core side magnetic film 5. Therefore, the core rRIJ magnetic film 5 does not become bent with respect to the magnetic flux return direction, and the decrease in magnetic permeability as described above is reliably prevented.

On the other hand, the same thing may happen to the slider side magnetic film 4 formed in the winding accommodation groove 3 of the slider 1, but since the slider 1 is made of a magnetic material, the slider side magnetic film 4 and the core side The influence of the slider-side magnetic film 4 on the characteristics of the magnetic circuit formed by the magnetic film 5 is reduced.

That is, FIG. 7 is a model showing an equivalent circuit of a magnetic circuit constituted by the slider-side magnetic film 4 and the core-side magnetic film 5 provided on the slider 1 and the core member 6, respectively, and g is the magnetic field in the magnetic gap G. Resistance, R1 is the magnetic resistance of the core side magnetic film 5 + RCI is the magnetic resistance of the core member 6 itself, R#2 is the magnetic resistance of the slider side magnetic film 4 +
Rc z is the magnetic resistance of the slider 1 itself.

Generally, the volume of the slider 1 made of a magnetic material such as ferrite is sufficiently large compared to the core member 6, and its magnetic resistance R
C2 is very small. Furthermore, Rc2 is very small compared to the magnetic resistance Rm2 of the magnetic film 4 on the slider side, and therefore, on the slider l side, most of the magnetic flux flows through the slider 1 itself, so the winding accommodation groove 3 is carved. The influence of the deterioration of magnetic permeability of the slider-side magnetic film 4 caused by this on the characteristics of the magnetic circuit becomes negligible.

On the other hand, on the side of the core member 6, since the volume of the core member 6 is small, variations in the magnetic resistance R1 of the core side magnetic film 5 with respect to the magnetic resistance PCI of the core member 6 cannot be ignored.

However, in the case of this embodiment, since the core-side magnetic film 5 is formed on the flat side surface of the core member 6 as described above, it is certain that the magnetic permeability μ will not decrease due to bending or the like of the core-side magnetic film 5. Therefore, an increase in magnetic resistance in the magnetic circuit formed by the core-side magnetic film 5, the slider-side magnetic film 4, etc. is reliably prevented.

This is particularly advantageous when, for example, the volume of the core member 60 is made small for the purpose of reducing inductance, or when the entire core member 6 is made of a non-magnetic material. A magnetic head with excellent electromagnetic conversion characteristics between the wound coil and the magnetic circuit can be realized.

[Embodiment 2] FIG. 2 is a perspective view showing the main parts of a magnetic head that is another embodiment of the present invention.

In this embodiment, both the slider-side magnetic film 4a and the core-side magnetic film 5a are formed to protrude in a V-shape with respect to the abutting surfaces of the slider la and the core member 6a. are connected to form an X shape.

Further, the width of the apex of the abutting portion of the slider-side magnetic film 4a and the core-side magnetic film 5a is formed by grinding or the like so that it is wider than the width of a track provided on a storage medium (not shown). At the same time, the bonding strength is maintained by filling the reinforcing glass member 7 around the abutting portions of the slider-side magnetic film 4a and the core-side magnetic film 5a.

In the case of this embodiment, the same effects as in the first embodiment can be obtained, and the magnetic material such as ferrite constituting the slider-side magnetic film 1a and the core member 6a and the slider-side magnetic film 4a and the core This has the effect of preventing the occurrence of a harmful contour effect that would create a pseudo magnetic gap at the boundary with the side magnetic film 5a.

[Embodiment 3] FIGS. 3(a) to 3(d) are plan views of each of a plurality of magnetic heads according to still another embodiment of the present invention, viewed from the bottom side.

In the third embodiment, in the slider 1b of each of the plurality of magnetic heads, only the region near the magnetic gap G is made of high magnetic permeability material 8a, 8b, 3c, 3d (such as Mn-Zn ferrite). The other parts are made of non-magnetic material 9a, 9b, 9c such as calcium titanate.
, 9d, respectively.

As a result, in the slider 1b that constitutes the magnetic circuit together with the core member 6b, the magnetic pair portion that is unnecessary for the electromagnetic conversion characteristics of the magnetic circuit is reduced, and the inductance of the magnetic head can be reduced.

[Embodiment 4] FIGS. 4(a) to 4(d) are plan views of a plurality of magnetic heads according to still another embodiment of the present invention, viewed from the bottom side.

In the case of the fourth embodiment, in each of the plurality of magnetic heads, a plurality of core members 61a, 62a, and 61b are provided at positions corresponding to the floating rails 2a, respectively.

By mounting the magnetic heads 62b, 61c, 62c, 61d, and 62d, a plurality of magnetic circuits and magnetic gaps Gl and G2 are formed in each magnetic head.

And multiple magnetic ports in each magnetic head! By selecting one of the magnetic gaps G+ and G2 with better characteristics and employing it in the actual recording operation by winding a coil, the yield in manufacturing each magnetic head can be improved. I can do it.

Furthermore, in each of the individual magnetic heads, parameters such as the film thickness and track width of the core-side magnetic film 5 and the slider-side magnetic film 4 (not shown) constituting the magnetic circuit in each of the plurality of magnetic gaps G1 and G2 are set to be different. By setting , it is possible to realize a magnetic head that has both a read-only head and a record-only head.

In addition, in the plurality of magnetic heads shown in FIGS. 4(a) to 4(d), the core members 61a, 62a, 61b.

62b, 61c, 62c, 61d, and 62d may be made of either a magnetic material or a non-magnetic material as long as the core-side magnetic film 5 deposited thereon has a structure that is not bent in the magnetic flux return direction. good.

In addition, the shaded areas in each of the magnetic heads shown in FIGS. 4(a) to (6) are made of magnetic materials 8e, 8F, 8g, and 8h, as in the case of the third embodiment. , the other parts are made of non-magnetic material 9f.

It consists of 9g and 9h.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that the present invention is not limited to the Examples and can be modified in various ways without departing from the gist thereof. Nor.

For example, the materials constituting the slider, core member, magnetic film on the slider side, magnetic film on the core side, etc. are not limited to those exemplified in each of the above-mentioned embodiments, but any material can be used as long as it satisfies the required physical properties. There may be.

〔Effect of the invention〕

A brief explanation of the effects obtained by typical inventions disclosed in this application is as follows.

That is, a core member having a magnetic film adhered to one flat side surface, and a slider having a winding receiving groove carved in the side surface to which this core member is joined and forming a magnetic circuit and a magnetic gap together with the core member. Because the magnetic head is made of The electromagnetic conversion characteristics of the head can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of a magnetic head that is an embodiment of the present invention, FIG. 2 is a perspective view of a magnetic head that is another embodiment of the present invention, and FIGS. 3(a) to (d) ) is a plan view of a magnetic head which is still another embodiment of the present invention, FIGS. 4(a) to (d) are plan views of a magnetic head which is still another embodiment of the present invention, and FIG. 5 is a plan view of a magnetic head which is still another embodiment of the present invention. FIG. 6 is an explanatory diagram illustrating an example of the relationship between the direction of incidence of sputtered particles and the magnetic permeability of a sputtered thin film. FIG. 6 is an explanatory diagram illustrating an example of the growth state of a sputtered thin film during sputtering. FIG. 2 is an equivalent circuit diagram of a magnetic circuit configured in a magnetic head that is an example. 1, la, lb, IC...slider, 2, 2a...
Floating rail, 3... Winding accommodation groove, 4° 4a... Slider side magnetic film, 5, 5a... Core side magnetic film (magnetic film)
, 6.6a, 6b, 61a. 62a, 61b, 62b, 61c, 62c, 61d, 6
2d... Core member, 7... Reinforced glass member, 8a,
8b, 8c, 8d, 8e, 8f, 8g, 8h = high magnetic permeability material, 9a, 9b, 9c, 9d, 9f, 9g, 9h
...Nonmagnetic material, G, G,, G2 ...Magnetic gap. Fig. 1 6... Core member 2nd
Figure 5: Zero incidence direction of sputtered particles Figure 7

Claims (1)

[Claims] 1. A core member having a magnetic film adhered to one flat side surface, and a winding receiving groove carved in the side surface to which the core member is joined,
A magnetic head comprising a slider that constitutes a magnetic circuit and a magnetic gap together with the core member. 2. The magnetic head according to claim 1, wherein the vicinity of the winding receiving groove of the slider is made of a magnetic material with high magnetic permeability. 3. The magnetic head according to claim 1, wherein a plurality of said core members are attached to said slider.