JPS60177411A - Production of main magnetic pole of magnetic head - Google Patents

Abstract

PURPOSE:To improve the junction strength and to simplify the winding work by joining a nonmagnetic matter to a groove of a magnetic matter via the glass to obtain a pair of reinforcement members through junction with formation of a magnetic thin film and forming a winding groove after putting together those two reinforcement members. CONSTITUTION:A nonmagnetic matter 3 is joined to a junction groove 11 formed at the front face of a soft magnetic matter 7a such as ferrite, etc. via the glass 12a. Thus a pair of reinforcement members are obtained after applying the mirror surface finishing to the side face of each member. Then a magnetic thin film 2 is formed to the side face of each reinforcement member to put together both members. Then a winding groove 8 is formed and a coil is put into the groove 8. Thus a main magnetic pole is produced with junction of a soft magnetic matter 7b such as ferrite, etc. The junction strength is improved by the mutual diffusion of the matter 7a and the glass 12a and the existence of the groove 11. Furthermore a winding work is simplified since insertion of a coil is possible during production of the main magnetic pole.

Description

[Detailed Description of the Invention] [Technical Field to which the Invention Pertains] The present invention relates to a magnetic head, and more specifically, a magnetic thin film with high magnetic permeability is sandwiched between two reinforcing members made of a magnetic material and a non-magnetic material bonded to each other. , each of the magnetic bodies of both reinforcing members is provided with a winding groove,
The present invention relates to a main pole excitation type magnetic head using a perpendicular recording method in which a coil is provided across these winding grooves, and particularly to a method for manufacturing the main pole.

[Prior art]

FIG. 1 is an explanatory diagram showing an example of a magnetic head using a conventional perpendicular recording method.
, and between two reinforcing members formed by bonding the non-magnetic material 3 to the front surface of the soft magnetic material 7, a magnetic thin film 2 with high magnetic permeability is provided.
are sandwiched to form the main magnetic pole 4, and the winding groove 8 of this main magnetic pole 4
, 8, and records a signal on the recording medium 1 running along the tip of the main magnetic pole 4 (the non-magnetic material 30 portion) and reproduces the recorded signal. It is something that can be done. Note that 9 is a return path section for improving reproduction efficiency.

Conventionally, the main pole of the magnetic head shown in FIG. 1 has been manufactured by the following process.

That is, as shown in FIG. 2(a), a winding groove 8 is formed on one surface of a block of soft magnetic material 7. Next, as shown in FIG. 2(b), a block of non-magnetic material 3 is bonded to the surface on the winding groove 8 side via an adhesive layer 10 to form a composite block. In this case, glass welding may be used instead of using adhesive. Thereafter, as shown in FIG. 2(C), this composite block is cut and its sides are all polished to make it flat, and this is used as a reinforcing member.

Next, as shown in FIG. 2(d), a high permeability magnetic thin film 2 is formed on the finished surface (side surface) of this reinforcing member by sputtering or the like, and is patterned into a desired shape by etching. As shown in FIG. 2(e), a reinforcing member produced in the same process as above is bonded to the surface of this reinforcing member on the magnetic thin film 2 side to form the main magnetic pole 4, and finally, as shown in FIG. 2(f), Then, the end surface of the main pole 4 (the end surface of the non-magnetic material 3) is polished to a smooth surface.

When manufacturing a magnetic head using such a process, the side surface of the reinforcing member, that is, a non-magnetic material, is formed in the process shown in FIG. 3. Adhesive layer IO or glass layer and soft magnetic material 7
must be polished at the same time. However, since the high permeability magnetic thin film 2 formed on the polished surface is thin, for example, 0.3 μm to 2 μm, it is necessary to keep the vicinity of the bonding surface flat, and the non-magnetic material 3 and the soft magnetic material 7t- In the case of bonding with adhesive, the presence of the adhesive layer 10 makes flattening difficult, which not only leads to deterioration of the magnetic properties of the thin film 2, but also has the disadvantage that the bonding strength is insufficient and the composite block becomes difficult to flatten. There is a risk of peeling off when cutting. Also,
When joining the non-magnetic material 3 and the soft magnetic material 7 by glass welding, it is difficult to control the amount of glass so that the winding groove 8 is left unblocked, and to allow the glass to penetrate sufficiently into the joint. If the glass does not penetrate sufficiently into the bonded portion, the surface 11f* of the bonded portion cannot be raised as in the case where the adhesive is used, which has the disadvantage of causing deterioration of the magnetic properties of the thin film 2. Further, in such a manufacturing method, it is necessary to wind the electromagnetic rod 4 across the winding grooves 8, 8 after manufacturing the electromagnetic rod 4, so that the winding process becomes complicated.

[Purpose of the invention]

The present invention has been made to improve the above-mentioned drawbacks.
It is possible to improve the bonding strength between the non-magnetic material and the magnetic material that make up the entire reinforcing member, and it is also possible to finish the side surface of the reinforcing member, which serves as a substrate on which a magnetic thin film with high magnetic permeability is formed, to the necessary surface accuracy. It is an object of the present invention to provide a method for manufacturing a main pole of a magnetic head suitable for high-density recording, which can simplify the winding process.

[Structure of the invention]

The method of the present invention to achieve the above object is to provide a bonding groove 11 on the front surface of a magnetic material 7□ as shown in the third figure, place a non-magnetic material 3 on the bonding groove 11 side with a glass 12 interposed therebetween, and A reinforcing member is constructed by joining the non-magnetic material 3 to the front surface of the magnetic material 7m by melting the magnetic material 12, and after forming a high permeability magnetic thin film 2 on the side surface of this reinforcing member, the magnetic thin film 2 is The main magnetic pole 4 is manufactured by joining the side surface of a reinforcing member configured in the same manner as above to the side surface.

[Configuration of Example]

An embodiment of the method of the present invention will be described in detail below with reference to FIG.

First, as shown in FIG. 3(a), the front surface 13' of a block of soft magnetic material 71 such as ferrite is polished to a mirror finish. Next, as shown in FIG. 31g(b), a bonding groove 11't- is formed on this front surface 13, and a non-magnetic material such as ceramic is placed on the bonding groove 11 side through glass 12 as shown in FIG. 3(C). As shown in FIG. 3(d), the glass 12 is completely melted to join the non-magnetic material 3 block to the front surface of the soft magnetic material 7m block to form a composite block. . t2m indicates a glass layer. Thereafter, as shown in FIG. 3(e), this composite block is cut and its side surfaces 14 are polished to a mirror finish, and this is used as a reinforcing member. Next, as shown in FIG. 3(f), a high permeability magnetic thin film 2 such as permalloy was formed on the finished surface (side surface) of this reinforcing member by sputtering or the like, and patterned into a desired shape by etching or the like. Thereafter, as shown in FIG. 3(g), the side surface of the reinforcing member obtained in the same process as above is joined to the surface of this reinforcing member on the magnetic thin film 2 side. Then the third
As shown in Figure (h), the soft magnetic material 7 of both reinforcing members. .

After forming winding grooves 8, 8 on the rear surface of 7, respectively, a soft magnetic material such as ferrite is used to form a back core on the surface on the side of these winding grooves 8, 8, as shown in FIG. 3(i). body btl
- Join them to form the main magnetic pole 4, and finally, as shown in FIG.
Polish and finish to a smooth surface.

[Creating effect of invention]

As described above, according to the method of the present invention, the non-magnetic material 3 and the magnetic material 7m constituting the reinforcing member are joined by melting the glass 12, and the winding grooves 8, 8, which are different from the conventional example described above, are bonded to each other by melting the glass 12. Since there is no need to control the amount of glass to avoid clogging the glass 12 and the magnetic material 7.0 during bonding, the bonding strength can be improved compared to the conventional method due to the mutual diffusion of the glass 12 and the magnetic material 7.0 and the presence of the bonding groove 11. Since the side surface of the reinforcing member as a substrate on which the magnetic thin film 2 is formed can be made into a flat surface with the necessary surface precision, there is no risk of damaging the magnetic properties of the magnetic thin film 2.
Furthermore, since the shape of the winding grooves 8, 8 can be adjusted, not only can a magnetic head suitable for high-density recording be provided, but also the coil 6 can be fitted into the winding grooves 8, 8 during the manufacture of the main pole 4. After insertion, the magnetic body 7bt forming the back core can be joined, which has the effect of simplifying the winding process.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of a conventional magnetic head, FIGS. 2(a) to (f) are explanatory diagrams of a conventional method for manufacturing the main pole of the magnetic head of FIG. 1, and FIG. 1A to 1J are explanatory diagrams of the method of the present invention for manufacturing the main magnetic pole of a magnetic head corresponding to FIG. 1; 2...Magnetic thin film with high magnetic permeability, 3...
Non-magnetic material, 4... Main magnetic pole, 6... Coil, 7. ．． 7b...(soft) magnetic material, 8.
...Winding groove, 9...Return path section,
11...Joining groove, 12...Glass, 1
2....Glass layer. Calculation 2nd Lieutenant (C) (tl) Salary 3 (e) (i) (in'7b (f) (h) ())

Claims (1)

[Claims] A bonding groove is provided on the front side of the magnetic material, a non-magnetic material is placed on the side of the bonding groove through glass, and the glass is melted to bond the non-magnetic material to the front surface of the magnetic material to form a reinforcing member. After forming a magnetic thin film with high magnetic permeability on the side surface of this reinforcing member, the side surface of the reinforcing member structured in the same manner as above is bonded to the surface on the magnetic thin film side to manufacture the main magnetic pole. A method for manufacturing the main pole of a magnetic head.