JPH02201719A - Composite magnetic head - Google Patents

Abstract

PURPOSE:To obtain good electromagnetic conversion characteristics by forming ferrite layers of a single crystal structure to parts of ferrite core half bodies where magnetic metallic films are formed. CONSTITUTION:The parts of the ferrite core half bodies 4, 5 forming the magnetic metallic films 6, 7 are formed as the ferrite layers 12, 13 of the single crystal structure. The smooth surfaces having good workability and high accuracy are, therefore, formed. The crystal orientational property of the magnetic metallic films 6, 7 formed on these smooth surfaces is, therefore, good and the magnetic metallic films 6, 7 having the excellent magnetic characteristics are obtd. The parts of the ferrite core half bodies 4, 5 exclusive of the ferrite layers 12, 13 of the single crystal structure are constituted of the ferrites 10, 11 of a polycrystal structure having excellent magnetic characteristics. The magnetic characteristics of both the ferrite core half bodies 4, 5 and the magnetic metallic films 6, 7 are improved in this way and the composite magnetic head 1 having the excellent electromagnetic conversion characteristics is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a composite magnetic head, and more particularly to a composite magnetic head that can be used with a magnetic recording medium having a high coercive force.

Conventional technology In general, a so-called metal-in-gap type composite magnetic head is known as a magnetic head that performs magnetic recording and reproducing processing for magnetic recording media with high coercive force (for example, metal tape)1. The head has a structure in which a metal magnetic film such as Sendust (registered trademark) is formed on the abutting surfaces of the ferrite core halves, and these are butt-joined via a gap material. The head has a structure in which a metal magnetic film is formed on a ferrite core half made only of medium-crystal M4 ferrite, or a metal magnetic film formed on a ferrite core half made only of polycrystalline ferrite. There was something that changed the structure.

Problems to be Solved by the Invention As is well known, the 7-elite crystal structure (hereinafter referred to as single crystal ferrite) has crystal anisotropy, and by appropriately utilizing this, high workability can be achieved. However, for the same reason, it has inferior magnetic properties such as magnetic permeability and saturation magnetic flux density compared to polycrystalline ferrite 1- (hereinafter referred to as polycrystalline ferrite 1). 1 On the other hand, polycrystalline ferrites called high-density ferrites, hot breath ferrites, etc. have the advantages of single-crystal ferrites as disadvantages, and also have characteristics characterized by disadvantages. Therefore, in a composite magnetic head that uses single-crystal ferrite as the ferrite core half, it has good workability, so the surface on which the metal magnetic film is formed can be processed to a high viscosity, and the crystal orientation of the metal magnetic film can be improved. Although this may be good, there are problems in that the magnetic permeability, saturation magnetic flux density, etc. in the ferrite core half are not sufficient, and the characteristics of the composite magnetic head as a whole are not sufficient.

Similarly, in a composite magnetic head that uses polycrystalline ferrite as the ferrite core half, the ferrite core half has good electromagnetic conversion characteristics, but has poor additivity, so the surface on which the metal magnetic film is formed is processed to have a high viscosity. Therefore, there was a problem that the characteristics of the formed metal magnetic film deteriorated, and even a composite magnetic head with this structure could not achieve sufficient characteristics.

The present invention has been made in view of the above points, and an object of the present invention is to provide a pitch magnetic head having good electromagnetic conversion characteristics. .

Means for Solving the Problems In order to solve the above problems, in the present invention, a composite noerite formed by forming a metal magnetic film on the abutting surfaces of ferrite core halves is formed by forming a gap between the halves. In the bonded composite magnetic head, the ferrite core half is made of polycrystalline ferrite, and a single-crystalline ferrite layer is formed on the part of the ferrite core half where the metal magnetic film is formed. It is characterized by becoming.

Effect In the composite magnetic head with the above configuration, the part of the ferrite core half where the metal magnetic film is formed is a ferrite layer with a single crystal structure, so it has good additivity and can form a highly accurate smooth surface. . As a result, the crystal orientation of the metal magnetic film formed on this smooth surface becomes good, resulting in a metal magnetic film with excellent magnetic properties. In addition, the parts of the ferrite core half other than the single-crystal structure ferrite layer are made of polycrystalline ferrite with excellent magnetic properties. Therefore, each of the magnetic properties of the ferrite core half and the metal magnetic film is Since both are good, a composite magnetic head having excellent electromagnetic conversion characteristics can be realized.

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. 1st
This figure is an external view of a composite magnetic head 1 which is an embodiment of the present invention, and FIG. 2 is a sectional view of the composite magnetic head 1 near the gap.

The composite magnetic head 1 has a structure in which a pair of composite half bodies 2.3 are butt-joined with a magnetic gap formed therebetween. Each of the composite core halves 2 and 3 is composed of ferrite core halves 4 and 5, which are a feature of the present invention, and sendust films 6 and 7, which are metal magnetic films having a higher saturation magnetic flux density than ferrite. There is. Note that numerals 8 and 9 shown in FIG. 1 indicate glass materials filled in the track width regulating grooves.

The ferrite core halves 4 and 5, which are a feature of the present invention, include a polycrystalline ferrite layer 10.11, a single crystal ferrite layer 12.
13 (each figure is marked with satin finish) and 3.
A single crystal 71548 layer 12.13 is formed on the abutting surface side of each ferrite core half body 4, 5, and the single crystal ferrite layer 12.130 is coated with Senges 1 to 6 and 7. It has a structure. 1. Furthermore, the single crystal ferrite layers 12 and 13 are directly formed on the polycrystalline portions 71541 to io and i1. Therefore, in the composite magnetic head 1 according to the present invention, in each of the composite core halves 2 and 3, the medium crystal ferrite layer 12 and 13 are interposed between the sendust films 6 and 7 and the polycrystalline ferrite portion 10°11. It becomes.

Next, a method of manufacturing the composite magnetic head 1 having the above structure will be explained. Note that since the manufacturing method for each composite core half body 2.3 is the same, only the composite core half body 2 will be described.

FIG. 3 shows a noelite block 14 that will later become a ferrite core half by core slicing. This ferrite block 14 is entirely composed of polycrystalline ferrite. Incidentally, various methods for producing polycrystalline fluorite are known, but the method is not particularly limited to any one of them.

This ) becomes the butting surface of the I light block 14 14
A single crystal ferrite layer 12 is formed in a. This single crystal ferrite layer 12 is formed using, for example, a solid phase growth method. Specifically, the single-crystal ferrite layer 12 is formed by placing a diffusion material on the abutting surfaces of ferrite blocks 14 made of polycrystalline ferrite and performing heat treatment in an appropriate atmosphere. By going through this process,
The ferrite block 14 is made up of a polycrystalline flight member 10 and a single crystal ferrite layer 12.

In addition, the single crystal ferrite layer 12 is a polycrystalline ferrite portion 1.
It becomes a continuous layer with 0.

As described above, the single-crystal ferrite layer 12 formed as described above has crystal anisotropy, and therefore, by utilizing this orientation, workability can be improved. Furthermore, for the same reason, mechanical strength can also be improved.

The ferrite block 14 on which the single-crystal ferrite I-layer 12 has been formed is then subjected to mirror polishing on the abutting surface 14a, and as shown in FIG. 1 where the groove 16 for the width 11i1 is formed; at this time, the surface 14- is subjected to mirror polishing;
Since "a" is the surface on which the medium-crystalline ferrite layer 1-layer 12 is formed, the polishing property is good, and the polished surface becomes a smooth surface with high viscosity.

On the ferrite block 14 which has been subjected to surface processing and filling 1 as described above, a sendust film 6 is subsequently formed by sputtering or the like to form a composite block 17 shown in FIG. At this time, the sendust film 6 is formed on the mirror-polished surface 14a which becomes the abutting surface, and as described above, the sendust film 6 is formed by forming the monocrystalline light layer 1 with good workability.
2 is mirror-polished, and has a highly accurate smoothness. Therefore, the sendust film 6 formed thereon becomes a good and uniform film, and its magnetic properties are improved. Furthermore, since the sendust film 6 is formed on the single-crystal ferrite layer 12 having a single-crystal structure having a constant orientation, the crystal orientation of the growing sendust is good, and this also improves the magnetic properties of the sendust film 6. Furthermore, for the same reason, the magnetic properties of the initially formed film of the sendust film 6 are also improved, so that the so-called coagulated gap effect caused by the initially formed film performing the same function as a non-magnetic material can be reduced. In addition, due to the formation of the sendust film 6, a large film stress is applied to the surface 14a, but as mentioned above, the mechanical strength of the single crystal ferrite layer 12 is also high, so the film stress causes the ferrite to There is no possibility that the block 14 will be damaged.

The composite block 17 formed as described above is joined to another similarly formed composite block via a gap material, and core sliced to form the composite magnetic head 1 shown in FIG. 1.

Therefore, in the composite magnetic head 1 formed as described above, the magnetic properties of the sendust films 6 and 7 are of generally good values. Furthermore, since the thickness of the single crystal ferrite layers 12 and 13 is selected to be sufficient to improve workability in mirror polishing, the ferrite lower half 4
．． The magnetic properties as 5 are approximately the magnetic properties of polycrystalline ferrite 1-, which is also a good value 1. Therefore, the electromagnetic properties of the composite magnetic head 1 as a whole are improved, and good magnetic recording and reproduction can be achieved. becomes possible. .

In the above embodiment, a metal-in-gap type composite magnetic head has been described, but the present invention can also be applied to a magnetic head having the above configuration. For example,
In the case of a video head that consists only of a single-crystal layer, the entire core is generally made of a single-crystal layer, since micro-machining is required. 1. Effects of the Invention As described above, in the present invention, the metal magnetic properties of the ferrite core half are improved. By forming a ferrite layer with a single crystal structure in the area where the body film is formed, the surface on which the metal magnetic film is formed can be processed with high precision, improving its smoothness and forming a single surface. Since it is a single-crystal layer with a 1-position, the magnetic properties of the metal magnetic film to be formed are improved, and the portion other than the single-crystal structure ferrite layer of the ferrite core half is made of polycrystal structure ferrite. Therefore, the magnetic properties of the ferrite core half are good, and the magnetoelectric conversion properties of the composite magnetic head can therefore be improved.

[Brief explanation of the drawing]

FIG. 1 is an external view of a composite magnetic head that is an embodiment of the present invention, FIG. 2 is a sectional view of the composite magnetic head shown in FIG. 1 near the gap, and FIGS. 3 to 6 are similar to those shown in FIG. 1゜1...Composite magnetic head, 2,3...
- Composite core half, 4.5... Ferrite core half, 6
,7... Sendust film, 10.11...-polycrystalline ferrite part, 12°13... Single crystal ferrite layer, 14
...Ferai I~ block, 17... composite block.

Claims (1)

[Scope of Claims] A composite magnetic head in which composite ferrite core halves each having a metal magnetic film formed on the abutting surfaces of the ferrite core halves are bonded to each other with a gap formed therein, the ferrite core halves comprising: 1. A composite magnetic head comprising: a ferrite having a polycrystalline structure; and a ferrite layer having a single crystal structure formed in a portion of the ferrite core half where the metal magnetic film is formed.