JPH02208810A - Magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To facilitate manufacturing and to prevent variance in gap dimension from being generated by arranging a magnetic film with high saturation magnetic flux density coming in contact with an I core, a magnetic film with low saturation magnetic flux density, and a gap film at the tips of the I core and a U core in sequence stated above. CONSTITUTION:An I type compound core structure body 10 is generated by filming the magnetic film 3 with high saturation magnetic flux density on an I core 2, and filming the magnetic film 4 with low saturation magnetic flux density on the film 3, and furthermore, filming the gap film 5 on the film 4. And after the I type compound core structure body 10 is generated, it is joined integrally with the U core with glass 6 as joining substance, and after that, post-working is executed on a sliding plane where a gap is exposed, etc. Therefore, it is not required to perform a filming process at a U core 1 side at all. In such a way, a manufacturing process can be simplified, and it is enough to form the gap film 5 only at an I core 2 side, which reduces probability to generate the dispersion.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic head suitable for use in a 70-tip disk, a magnetic head for a hard disk, etc., and a method for manufacturing the same.

(Prior Art) A conventional magnetic head of this type and its manufacturing method will be explained with reference to FIGS. 3 and 4. In these figures, 1 is a U-core made of 7-elite (also called C-core), and 2 is an Eco-core made of 7-elite.
and a gap film 5 are laminated to create a U-shaped composite core structure 7 as shown in FIG. Create body 8. After that, the U-shaped composite core structure 7 and the engineering-shaped composite core structure 8 are butted together as shown in FIG.
They are joined and integrated with glass 6, and post-processing of sliding surfaces and the like where gaps are exposed is performed.

In this case, when the traveling direction of the magnetic recording medium such as a floppy disk or hard disk is set to the X direction, the magnetic recording medium passes through the magnetic film 4 with a low saturation magnetic flux density, the gap film 5, and the magnetic film 3 with a high saturation magnetic flux density in this order. This is an array. At the time of reading, the read operation is performed using a narrow reading gear Gr due to the thickness of the gap film 5, and during writing, the reading gear Gr is narrow due to the thickness of the gap film 5, and during writing, since the magnetic film 4 with a low saturation magnetic flux density is saturated, the total thickness of the gap @5 and the magnetic film 4 is A write operation is performed with a certain wide write gap length Gw.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional technology, it is necessary to form films on both the C core 1 and the I core 2 using thin film technology, which complicates the manufacturing process. Since gap films 5 are formed on both sides of one core 2, and the sum of the thicknesses of both gap films becomes the read gap length Gr, the read gap length Gr varies due to variations in either gap film 5 during manufacturing. The structure was prone to variations during manufacturing.

In view of the above points, it is an object of the present invention to provide a high-performance magnetic head that is easy to manufacture and is less likely to cause variations in gap size, and a method for manufacturing the same.

(Means for Solving the Problems) In order to achieve the above object, in the magnetic head according to the present invention: A magnetic film with a high saturation magnetic flux density, a magnetic film with a low saturation magnetic flux density, and a gap film are arranged in this order between the tips of the I:IA.

Further, the method for manufacturing a magnetic head of the present invention includes the steps of: (1) laminating a magnetic film with a high saturation magnetic flux density, a magnetic film with a low saturation magnetic flux density, and a gap film on the core in this order to create an I-type composite core structure; The method includes a step of joining and integrating the I-type composite core structure and the C core with a joining material.

(Function) In the present invention, the magnetic film with high saturation magnetic flux density, the magnetic film with low saturation magnetic flux density, and the gap film can be formed on the core side, and the film formation process on the C core side is completely unnecessary. becomes. Therefore, the manufacturing process is simplified, and the gap film only needs to be formed on the I core side (and the possibility of variations occurring is reduced).

(Example) Hereinafter, an example of a magnetic head and a manufacturing method thereof according to the present invention will be described with reference to the drawings.

In Figures 1 and 2, 1 is a 7-elite U-core (
2 is a ferrite I core. First, a magnetic film 3 with a high saturation magnetic flux density is formed on the I core 2, a magnetic film 4 with a low saturation magnetic flux density is formed on it, and then a magnetic film 4 with a low saturation magnetic flux density is formed on the I core 2. A gap film 5 is formed thereon to create an I-type composite core structure 10 as shown in FIG.

Here, as the magnetic film 3 with high saturation magnetic flux density, FeAl
5i (Sendust) or cobalt-based Amol 77S with a saturation magnetic flux density Bs≧0.8T can be used. In addition, as magnetic FE4 with low saturation magnetic flux density, cobalt-based 7 mol 7
7s, YIG, 7elise, etc. with Bs≦0.4T can be used. Further, the gap film 5 is made of an oxide such as SiO2, a nonmagnetic metal, or the like. Here, the magnetic film 3 with high saturation magnetic flux density has a film thickness of 0.2 μm to 5.0 μm, preferably 0.5 μIo to 3.0 μm, and the magnetic film 4 with low saturation magnetic flux density has a thickness of 0.3 μm to 5.0 μm. , 0 μm film thickness, preferably 0.3 μm-2.0 μm 1 gear”/ply film 5 is 0.1 μI
I~2. Film thickness of OAI, preferably 0.1 μm ~
1.0μ feeling. Each film 3, 4.5 is formed using thin film technology.

As described above, the magnetic film 3 with high saturation magnetic flux density, the magnetic film 4 with low saturation magnetic flux density, and the gap film 5 are laminated in this order on the I core 2,
After creating the arranged I-type composite core structure 10, this and the C core 1 are joined together with a lath 6 as a joining material, and then post-processing of sliding surfaces etc. where gaps are exposed is performed.

In the case of this embodiment, when the traveling direction of a magnetic recording medium such as a 70 tsupee disk or a hard disk is set to the X direction, the core 2 is located on the side where the medium is removed, the gap film 5 and the magnetic film 4 with low saturation magnetic flux density. The magnetic recording medium is arranged to pass through the magnetic film 3 having a high saturation magnetic flux density and the magnetic film 3 having a high saturation magnetic flux density. At the time of reading, the read operation is performed with a narrow read gap length Gr due to the thickness of the gap film 5, and at the time of writing, since the magnetic film 4 with a low saturation magnetic flux density is saturated, the thickness is the sum of the thickness of the gap film 5 and the magnetic wA4. Wide write gap length G
Perform a write operation with w.

(Effects of the Invention) As explained above, according to the present invention, (1) it is only necessary to stack and form a magnetic film with a high saturation magnetic flux density, a magnetic film with a low saturation magnetic flux density, and a gap film only on the core side ( , it is possible to eliminate the need for film formation on the C core side.Therefore, the manufacturing process can be simplified.

Further, the gap film only needs to be provided on the eco core side, and the possibility of variation in gap length can be reduced compared to the conventional structure in which gap films are provided on both the U core and the I core.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and is an enlarged cross-sectional view of a joint between a U core and an I core of a magnetic head, FIG. 2 is an exploded view for explaining the embodiment, and FIG. 3 shows a conventional technology. Enlarged cross-sectional view of the joint part between the U-core and the eco-core of the magnetic head, No. 4
The figure is an exploded view for explaining the prior art. 1... U core, 2... ■core, 3... Magnetic film with high saturation magnetic flux density, 4... Magnetic film with low saturation magnetic flux density, 5...
... Gap film, 6... Lath, 10... Engineering type composite core structure.

Claims (2)

[Claims] (1) In a magnetic head in which an I core and a U core are butted together via a gap film, a magnetic film with a high saturation magnetic flux density and a low saturation magnetic flux density is in contact with the I core between the tips of the I core and the U core. A magnetic head characterized in that a magnetic film and a gap film are arranged in this order. (2) After creating an I-type composite core structure by laminating a magnetic film with a high saturation magnetic flux density, a magnetic film with a low saturation magnetic flux density, and a gap film in this order on the I-core, the I-type composite core structure and the U core are laminated in this order. A method of manufacturing a magnetic head, characterized in that the two are integrally bonded together using a bonding material.