JPS62285205A - Perpendicular magnetic recording head - Google Patents

Abstract

PURPOSE:To attain the sufficient recording sensitivity and a reproducing output with a sufficiently large level even with miniaturization by providing a soft magnetic film with a high permeability on the surface of a core member of a supporting member. CONSTITUTION:The soft magnetic film 6 is formed on the surface of the core member 2 of the supporting member 1 and the film 6 and the core member 2 are stuck by an adhesive layer 5, and a main magnetic pole winding 4 is applied to the core member 2. That is, the soft magnetic film 6 is provided to the entire surface at the side of the core member 2 of the supporting member 1 to increase the area of the main magnetic pole film 3 opposed to the core member 2 effectively thereby reducing the magnetic resistance 3, then the magnetic flux caused from the core member 2 is focused efficiently to the film 3, and vice versa. Thus, the magnetic coupling between the main magnetic pole film 3 and the core member 2 is intensified, and even if the perpendicular magnetic recording head is miniaturized in a degree that, e.g., the magnetic pole length is nearly the same as the thickness of the adhesive layer 5, the excellent recording sensitivity and a sufficiently large reproducing output are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION 3. Detailed Description of the Invention The present invention relates to a perpendicular magnetic recording head, and particularly to a technique that is effective when applied to a main pole excitation type perpendicular magnetic recording head.

Conventionally, main pole excitation type perpendicular magnetic recording heads have been manufactured by the following method. In the first method, as shown in FIG. 2, a holding member 1 made of a non-magnetic material and a core member 2 made of ferrite are bonded together.Then, as shown in FIG. After forming a film and etching it into a predetermined shape having a width corresponding to the track width of the perpendicular magnetic recording medium, members 1 and 2 having the same shape as shown in FIG. 2 are shown in FIG. 4. Finally, the main pole winding 4 for recording and reproduction is applied to the core member 2 to complete the perpendicular magnetic recording head (for example, the 8th
Annual Japanese Society of Applied Magnetics Academic Lecture Abstracts 15a [1-12,
p. 252).

In the second method, as shown in FIG.
A main magnetic pole film 3 is formed on the side surface of the main magnetic pole film 3, and a holding member 1 having a shape similar to that shown in FIG. 5 is bonded to this main magnetic pole film 3 as shown in FIG. The core member 2 is then bonded to the holding member l as shown in FIG. 8, and the main pole winding 4 is finally applied to complete the perpendicular magnetic recording head. For example, 1985 IEICE Comprehensive National Conference Lecture Proceedings Volume 1.
189. p. 190).

According to the first conventional manufacturing method described above, a nearly ideal perpendicular magnetic recording head can be manufactured, but the main pole film 3 is formed after the holding member 1 and the core member 2 are bonded together. To polish the surface that should be.

There is a problem that it is difficult to obtain a good polished surface. Furthermore, after forming the main pole film 3 and etching it, when bonding the holding member 1 and the core member 2 together as shown in FIG. Holding member 1 and core member 2 to be matched
It is necessary to match the boundary surface of
Particularly when the holding member 1 and the core member 2 are opaque, there is a problem in that it is very difficult to bond them together. For this reason.

A perpendicular magnetic recording head having a structure as shown in FIG. 4 is undesirable because its manufacturing process is difficult.

Furthermore, although the above-mentioned second conventional manufacturing method is simpler in polishing the film-forming surface of the main pole film 3 and bonding the holding member 1 than the first manufacturing method, it has the following problems. . That is, in the process shown in FIG. 8, the core member 2 is bonded to the holding member L using an adhesive.1 With the adhesive commonly used, the thickness of the adhesive layer must be several μm in order to obtain sufficient adhesive strength. - It is said that it is necessary to make it several 10 μm.

On the other hand, it is experimentally known that reducing the overall size of the perpendicular magnetic recording head improves recording sensitivity and reproduction output, and perpendicular magnetic recording heads with a main pole length of about 10 μm have already been announced. In this case, for example, as shown in FIG. 9, the main pole length becomes approximately the same as the thickness of the adhesive layer 5,
Since the area of the main pole film 3 facing the core member 2 is very small, the magnetic coupling between the main pole 83 and the core member 2 becomes weak.

As a result, there is a problem that the recording sensitivity and reproduction output of the head may deteriorate.

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique that can obtain good recording sensitivity and a sufficiently large reproduction output even when a perpendicular magnetic recording head is downsized.

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

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a main magnetic pole film,
In a perpendicular magnetic recording head comprising a holding member for holding the perpendicular magnetic recording head and a core member coupled to the holding member, a soft magnetic film with high magnetic permeability is provided on the surface of the holding member on the core member side. It is characterized by:

Hereinafter, one embodiment of the present invention will be specifically described based on the drawings.

In FIG. 1, parts having the same functions as the conventional perpendicular magnetic recording heads shown in FIGS. 2 to 9 are given the same reference numerals.

As shown in FIG. 1, in the main pole excitation type perpendicular magnetic recording head according to this embodiment, a main pole film 3 is held by a pair of holding members 1 made of a nonmagnetic material. The entire surface of the holding member l on the side of the core member 2, which will be described later, is coated with, for example, Fe-Ni alloy or C.

A soft magnetic film 6 having a high magnetic permeability such as a magnetic alloy is provided. The soft magnetic film 6 and the core member 2 made of a magnetic material such as ferrite are bonded together by an adhesive layer 5, thereby integrally bonding the holding member 1 and the core member 2. Further, a main magnetic pole film [4] for recording and reproduction is provided around the core member 2.

In order to manufacture the perpendicular magnetic recording head according to this embodiment configured as described above, the steps are first carried out in the same manner as shown in FIGS. A soft magnetic film 6 is formed on the surface of the member 1 on the core member 2 side, and then the soft magnetic film 6 and the core member 2 are bonded together with an adhesive layer 5, and the main pole winding 4 is applied to the core member 2. .

The above embodiment has the following advantages.

That is, by providing the soft magnetic film 6 on the entire surface of the holding member 1 on the core member 2 side, the area of the main magnetic pole film 3 facing the core member 2 is effectively increased, thereby increasing the magnetic resistance. Since the magnetic flux is small, the magnetic flux generated from the core member 2 is efficiently focused on the main pole film 3, and vice versa. Therefore, the magnetic coupling between the main pole film 3 and the core member 2 can be strengthened. For example, when the perpendicular magnetic recording head is downsized to the extent that the main pole length is approximately the same as the thickness of the adhesive layer 5. Also, good recording sensitivity and sufficiently large reproduction output can be obtained.

Further, the perpendicular magnetic recording head according to the above embodiment has a fifth
It can be easily manufactured by a simple process as shown in FIGS. 7 and 1.

Note that if the coefficient of thermal expansion of the magnetic material such as ferrite that constitutes the core member 2 and the non-magnetic material that constitutes the holding member 1 is significantly different, strain may be applied to the soft magnetic film 6 through the adhesive layer 5. For example, between the core member 2 and the adhesive layer 5 or between the soft magnetic film 6 and the adhesive layer 5, the non-magnetic material constituting the holding member 1 may By providing films made of materials having substantially the same coefficient of thermal expansion, it is possible to prevent strain from occurring in the soft magnetic film 6, and thus this problem can be solved.

The present invention has been specifically described above based on one embodiment.
It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

For example, the soft magnetic film 6 does not necessarily need to be provided on the entire surface of the holding member 1 on the core member 2 side, and it is possible to reduce the magnetic resistance by providing it only on a part of the surface. It is possible to obtain the same effects as in the embodiment.

As explained above, according to the present invention, a soft magnetic film with high magnetic permeability is provided on the surface of the holding member on the core member side, so that magnetic coupling between the main pole film and the core member is prevented. Therefore, even when the perpendicular magnetic recording head is downsized, good recording sensitivity and a sufficiently large reproduction output can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a main pole excitation type perpendicular magnetic recording head according to an embodiment of the present invention, and FIGS. 2 to 4 are sectional views illustrating a conventional method of manufacturing a perpendicular magnetic recording head. . 5 to 8 are cross-sectional views for explaining another conventional method of manufacturing a perpendicular magnetic recording head. FIG. 9 is a sectional view showing a conventional perpendicular magnetic recording head when it is miniaturized. In the figure, 1... holding member, 2... core member, 3...
Main pole film, 5... adhesive layer, 6... soft magnetic film.

Claims (1)

[Claims] In a perpendicular magnetic recording head comprising a main pole film, a holding member for holding the main pole film, and a core member coupled to the holding member, a high magnetic permeability film is provided on the surface of the holding member on the core member side. A perpendicular magnetic recording head characterized by being provided with a soft magnetic film.