JPH04117608A - Magnetic head device - Google Patents

Abstract

PURPOSE:To improve performance at the both sides of recording and reproduction by providing the partition wall of either and insulator or a high resistance body on one gap opposing face, and embedding a magnetic metal film among the partition walls. CONSTITUTION:A grid-shaped partition wall 24 is formed on the gap forming face of a core half body 21, and a magnetic metal film 25 is embedded among the partition wall 24 by the height of the wall. Therefore, only an eddy current loss corresponding to one section surrounded by the partition wall 24 is generated even when magnetic fluxes pass in a direction vertical to the metal magnetic fluxes pass in a direction vertical to the metal magnetic film 25, and the effective permeability of the film 25 can be improved. Thus, the reproduced characteristic of an MIG head can be improved, and a magnetic head device which has high performance can be obtained at the both sides of recording and reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a magnetic head device used in a magnetic recording/reproducing device such as a video recorder.

(Prior Art) Recently, in magnetic heads, metal magnetic materials such as sendust or amorphous are used to fill the gap G between magnetic cores such as ferrite in order to cope with the high coercive force and high residual magnetic flux density of recording media. M sandwiched between metal magnetic film layers
A magnetic head called an IG head has been developed. Since these metal magnetic films have a high saturation magnetic flux density, this MIG head can generate a magnetic field strong enough to write on a high coercive force recording medium.

FIG. 3 shows a conventional MIG magnetic head. The core half-hole is formed of a pair of magnetic cores 18% 1b made of ferrite or the like. Between these magnetic cores la and lb,
A gap G formed by non-magnetic film layers 3a and 3b such as 5i02 is formed by being sandwiched between metal magnetic film layers 2a and 2b. That is, as shown in FIG. 4, track widths Tw are formed in the magnetic cores la and lb at a predetermined pitch interval P (only one is shown in FIGS. 4(a) and 4(b)). On the surface corresponding to this track width Tw, metal magnetic film layers 2a and 2b with a thickness of, for example, about 4 to 8 μm are formed by sputtering or the like, and on these metal magnetic film layers 2a and 2b, a thickness of about 0.2 to 0.5 μm is formed. nonmagnetic film layer 3a.

3b is similarly formed by sputtering or the like. The magnetic cores la and lb on which the metal magnetic film layers 2a and 2b and the nonmagnetic film layers 3a and 3b are formed have a track width Tw.
After the corresponding surfaces are opposed to each other and bonded using adhesive glass 4, they are cut as shown by broken lines in FIG. 4(C) to form the magnetic head shown in FIG. 3.

(Problems to be Solved by the Invention) According to the above-mentioned magnetic head, the metal magnetic material generally has a small resistivity, so the eddy current loss is large, and the high frequency characteristics of the effective magnetic permeability are poor.

To avoid this drawback, a magnetic thin plate (or thin film)
It is effective to layer them. Therefore, in the case of a magnetic core made of a thin film, if the magnetic flux flows in a direction parallel to the film layers, the effective magnetic permeability can be increased by laminating layers.

However, in the case of the MrG head, as is clear from the above-mentioned process, the structure is such that the magnetic flux flows in a direction perpendicular to the thin film surface. For this reason, it is not possible to improve high frequency characteristics by means of lamination.

Rather, regarding the reproduction characteristics affected by magnetic permeability, MIG
The current situation is that the heads are not better than conventional heads, but are worse.

SUMMARY OF THE INVENTION An object of the present invention is to improve the reproduction characteristics of the MIG head as described above and to provide a high-performance magnetic head device that exceeds the performance of conventional ferrite heads in both recording and reproduction.

[Structure of the Invention (Means for Solving the Problems) This invention provides a method for forming a metal magnetic film on at least one gap-opposed surface of a pair of ferrite core halves, and forming a metal magnetic film between the metal magnetic film surfaces or between the metal magnetic film surfaces. In a metal-held head made by bonding the gap-opposing surfaces of a magnetic film and a ferrite core via a magnetic gap, a partition wall made of an insulator or a high-resistance material is provided on at least one gap-opposing surface, and a partition wall made of an insulator or a high-resistance material is provided between the gaps. It has a structure in which a metal magnetic film is embedded.

Further, in the present invention, the partition walls are arranged in a lattice pattern from the surface facing the gap and inclined obliquely with respect to the track width direction.

(Function) With the above means, even when magnetic flux flows in a direction perpendicular to the membrane, only the eddy current loss corresponding to one section surrounded by the partition wall is generated, and the effective magnetic permeability of the membrane can be increased. M.I.
The reproduction characteristics of the G head can be improved.

In addition, even if the depth changes, sudden changes in characteristics do not occur,
Stable characteristics can be obtained over long periods of time.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the main parts of an embodiment of the present invention. 21 indicates one of the ferrite core halves. A lattice-shaped partition wall 24 is formed on the gap forming surface of the core half body 21 . L is the height of the wall. A metal magnetic film 25 is embedded between the partition walls 24 by the height of the walls.

The composite structure of the partition wall 24 and the metal magnetic film 25 described above is manufactured as follows.

First, the gap-forming surface of the ferrite, on which track grooves, winding grooves, glass grooves, etc. have been processed, is mirror-finished. Then, as shown in FIG. 2(a), a silicon oxide (Si0
2) A film 22 is formed with a thickness of 5 μm by sputtering. This 5
A resist 23 with a thickness of about 3 μm is placed on the top surface of the i02 film 22.
is coated and patterned with lines/spaces -4/1 μm. This patterning is done so that the pattern of the partition walls remains and is set in a grid pattern, with the direction of the walls at 45 degrees with respect to the track width direction (see the perspective view of FIG. 1).

Next, perform RIE processing to etch 5i02 into the second layer.
Figure (C) The remaining resist is removed by cleaning (
Figure 2(d)). As a result, the 5in2 partition wall 24
is formed. Next, as shown in FIG. 2(e), a sendust film (metallic magnetic film 25) is sputtered until the space between the partition walls 24 is completely filled. Next, as shown in FIG. 2(f), the magnetic film forming process is completed by finishing the surface to a flat and mirror finish by lap polishing, and the gap part structure as shown in FIG. 1 is completed. is obtained.

In the above explanation, one gap part of the magnetic head is taken up, but in reality, as shown in Fig. 4, a large number of core halves can be cut out, and the core is cut out on the gap forming surface. The above-mentioned partition wall 24 and metal magnetic film 25 are formed.

The MIG head processed and assembled as described above is
Even when magnetic flux flows perpendicular to the film surface, its cross section is 5
Since it is separated by a partition wall made of i02, the area is 4 μm2, and if it is Sendust with a specific resistance of about 100 μΩ·cm, eddy current loss will hardly be a problem. As a result, the effective magnetic permeability in the direction perpendicular to the film surface increased (recovered), and the head characteristics increased by 2 to 3 dB in the high frequency range.

In addition, since the lattice-shaped walls are tilted at 45 degrees to the track width direction, the occupancy of the 5i02 walls within the track remains constant even when the depth decreases, ensuring stable characteristics even when running for long periods of time. I was able to get it.

Assuming that the track width direction and the partition wall direction are the same, the wear of the head will result in 5.
The amount of j02 present will change.

As mentioned above, this MIG head not only has high recording ability, but also avoids eddy current loss, has high playback ability, and has stable characteristics even with depth fluctuations.
I can do 7 things.

[Effects of the Invention] As explained above, according to the present invention, it is possible to provide a high-performance magnetic head device that exceeds the performance of conventional ferrite heads in both recording and reproduction.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the main parts of an embodiment of the present invention, and FIG.
The figure is an explanatory diagram for explaining the manufacturing process of the main parts of the head of the present invention, Fig. 3 is an explanatory diagram of the configuration of a conventional MIG head, and Fig. 4 is an explanatory diagram for explaining the manufacturing process of a conventional MIG head. FIG. 21... Core half, 24... Partition wall, 25...
Metal magnetic film. Applicant's agent Patent attorney Takehiko Suzue Figure 4

Claims (2)

[Claims] (1) A metal magnetic film is formed on the gap-opposing surfaces of at least one of a pair of ferrite core halves, and the metal magnetic film surfaces or the gap-opposing surfaces of the metal magnetic film and the ferrite core are formed into a magnetic gap portion. In order to partition at least one gap-opposing surface into a plurality of parts in a metal-held head formed by adhering the metal through the gap, a partition wall made of an insulator or a high-resistance material is provided on the opposing surface. A magnetic head device characterized by having a structure in which a magnetic film is embedded. (2) the partition wall has a lattice shape on the opposing surface;
2. The magnetic head device according to claim 1, wherein the direction of the wall is oblique to the head gap direction.