JPS60177410A - Production of main magnetic pole of magnetic head - Google Patents

Abstract

PURPOSE:To increase the junction strength and to prevent the deterioration of a magnetic thin film by melting glass into a groove of a magnetic matter to obtain a pair of reinforcement members and putting together both members after forming a magnetic thin film to the side face of each member. CONSTITUTION:A junction groove 9 is formed to the front face of a soft magnetic matter 7 such as ferrite, etc., and the glass 3, i.e., a nonmagnetic matter is melted into the groove 9. Then a pair of reinforcement members are produced after polishing the upper face and applying mirror surface finishing to the side face of the matter 7. Then a magnetic thin film 2 of high permeability like ''Permalloy'', etc. is formed to the side face of each reinforcement member by a sputtering process, etc. These side faces of both members are put together to form a main magnetic pole. The junction strength is improved owing to the mutual diffusion of the nonmagntic matter 3 and the magnetic matter 3 and existence of the groove 9. Furthermore the mirror surface finishing is applied to the substrate of the film 2 to obtain a flat and thin layer. This prevents the deterioration of magnetic characteristics.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a magnetic head, specifically, a magnetic thin film with high magnetic permeability is provided between two reinforcing members made by bonding a non-magnetic material to the front surface of a magnetic material. The present invention relates to a perpendicular recording type magnetic head using a sandwiched main pole, and particularly to a method of manufacturing the main pole.

[Prior art]

FIG. 1 is an explanatory diagram showing a first example of a conventional magnetic head using the perpendicular recording method, and is an example using both main and auxiliary magnetic poles.

In this first example, a main magnetic pole 4 is constructed by sandwiching a magnetic thin film 2 with high magnetic permeability such as permalloy, amorphous alloy, etc. between two reinforcing members made of non-magnetic material 3 such as ceramic. An auxiliary magnetic pole 5 is disposed opposite to the auxiliary magnetic pole 5.
A coil 6 is wound around the 1 ft main recording medium having a perpendicular axis of easy magnetization.

By running the magnetic pole between the auxiliary magnetic poles 4 and 5, a signal can be recorded on the recording medium 1, or a recorded signal can be reproduced.

FIG. 2 is an explanatory diagram showing a second conventional example, in which only the main magnetic pole is used. This second example is a soft magnetic material 7 such as ferrite.
A main magnetic pole 4 is constructed by sandwiching a high permeability magnetic thin film 2 between two reinforcing members made by bonding a non-magnetic material 3 to the front surface of the main magnetic pole 4, and a coil 6 is wound around the main magnetic pole 4. It is possible to record a signal on the recording medium 1 running along the non-magnetic material 3 side of the main magnetic pole 4 and to reproduce the recorded signal.

FIG. 5 is an explanatory diagram showing a third conventional example, which is also an example using only the main magnetic pole. This third example includes a reinforcing member constructed by providing a winding groove 12 on the front surface of a soft magnetic material 7 and bonding a non-magnetic material 3 to the front surface of the soft magnetic material 7, and a reinforcing member constructed in the same manner. A magnetic thin film 2 with high magnetic permeability is sandwiched therebetween, and a coil 13 is provided spanning the winding grooves 12, 12 of both reinforcing members. In addition, 14 and 14 are return bus parts for improving reproduction efficiency, and 15 is a support part on which winding is applied.

Currently, the magnetic head shown in FIG. 1 is also shown in FIG.

Similar to the magnetic head shown in FIG. 5, a main pole 4 is used in which the magnetic thin film 2 is reinforced with a soft magnetic material 7 and only the tip portion is guarded with a non-magnetic material 3.

Conventionally, a main magnetic pole as shown in the second figure has been manufactured by the following process.

That is, as shown in FIG. 3(a), a non-magnetic material 3 and a soft magnetic material 7 are used, and as shown in FIG. are joined to form a reinforcing member, and the side surfaces of this reinforcing member are polished to a flat surface. Next, as shown in FIG. 3(C), 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. 3(d), 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. 3(e). As shown in FIG. 2, the end surface of the non-magnetic material 3 of the main pole 4 is polished to a level near the soft magnetic material 7.

When manufacturing the main pole of a magnetic head using such a process, the side surface of the reinforcing member,
That is, the surfaces of the nonmagnetic material 3, adhesive layer 8, and soft magnetic material 7 must be polished at the same time. However, the magnetic thin film 2 with high magnetic permeability formed on the polished surface has a thickness of, for example, 0.3 μm.
Since it is thin (n~2 μm), it is necessary to keep the area near the bonding surface flat, and the presence of the adhesive layer 8 makes flattening difficult, which has the drawback of causing deterioration of the magnetic properties of the thin film 2. However, since the joining strength is insufficient, when a composite block is made by joining a block of non-magnetic material 3 and a block of soft magnetic material 7, and the reinforcing member is obtained by cutting this composite block, the cutting is necessary. There is a risk that it may peel off over time.

[Purpose of the invention]

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

[Structure of the invention]

In the method of the present invention to achieve the above object, a bonding groove 9 is formed on the front surface of the magnetic material 7 as shown in the fourth figure, and a molten material such as glass (an easy non-magnetic material 3 is placed on the side of the bonding groove 9). Then, by melting this non-magnetic material, the non-magnetic material 3 is bonded to the front surface of the magnetic material 7 to form a reinforcing member, and after forming a high permeability magnetic thin film 2 on the side surface of this reinforcing member, this The main magnetic pole 4 is manufactured by joining the side surface of a reinforcing member configured in the same manner as described above to the surface on the magnetic thin film 2 side.

[Configuration of Example]

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

First, as shown in FIG. 4(a), the front surface 10 of a block of soft magnetic material 7 such as ferrite is polished to a mirror finish.

Next, as shown in FIG. 4(b), a joining groove 9 is formed on this front surface 10.
As shown in FIG. 4(C), glass 3, which is a non-magnetic material, is placed on the side of this joining groove 9, and by melting this glass 3, a soft magnetic material 7 is formed on the front surface of the block. glass 3
are joined to form a composite block. Next, Figure 4(d)
As shown in the figure, the upper surface of the glass 3 of this composite block is polished to a flat surface.

Thereafter, as shown in FIG. 4(e), this composite block is cut, its side surfaces 11 are polished to a mirror finish, and this is used as a reinforcing member. Next, as shown in FIG. 4(f), a high permeability magnetic thin film 2 such as permalloy was formed on the finished surface (side surface) 11 of this reinforcing member by sputtering or the like, and was patterned into a desired shape by etching. After, Figure 4 (
g) As shown in K, 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 to form the entire main magnetic pole 4, and finally, as shown in Fig. 4 (h). As shown, the end surface of the main pole 4 (the end surface of the glass 3) is polished to a smooth surface.

[Function and effect of the invention]

As described above, according to the method of the present invention, the non-magnetic material 3 and the magnetic material 7 constituting the reinforcing member are bonded together using the non-magnetic material 3 such as glass.
Since this is done by melting the non-magnetic material 3 and the magnetic material 7, the bonding strength can be improved compared to the conventional method due to the mutual diffusion of the non-magnetic material 3 such as glass and the magnetic material 7 and the presence of the bonding groove 9. 7 does not contain an adhesive layer, the side surface of the reinforcing member, which serves as a substrate on which the high permeability magnetic thin film 2 is formed, can be polished to a flat surface with the required surface accuracy, and the magnetic thin film 2 Since there is no risk of deteriorating the characteristics, a magnetic head suitable for high-density recording can be provided.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a first example of a conventional magnetic head;
The figure is an explanatory diagram showing the second example as well! Figure 3 (a) to (e)
) is an explanatory diagram of the conventional method for manufacturing the main magnetic pole shown in FIG. 2, and FIGS. 4(a) to (h) are explanatory diagrams of the method of the present invention for manufacturing the entire main magnetic pole corresponding to FIG. FIG. 5 is an explanatory diagram showing a third example of a conventional magnetic head. 2...Magnetic thin film with high magnetic permeability, 3...
Non-magnetic material, 4... Main magnetic pole, 6... Coil, 7... (Soft) magnetic material, 9...
・Joint groove. ! f, S, H': +・Pa1 Agent Patent attorney Ishito), Motoi ,,l? (e) 6 moves 9 7 7 Jun (!J) (h Jun 5 ward

Claims (1)

[Claims] A bonding groove is formed on the front surface of the magnetic material, a non-magnetic material that is easily melted such as glass is placed on the surface on the side of the bonding groove, and the non-magnetic material is bonded to the front surface of the magnetic material by melting the non-magnetic material. After forming a high permeability magnetic thin film on the side surface of this reinforcing member, the side surface of the reinforcing member configured in the same manner as above is bonded to the surface on this magnetic thin film side to manufacture the main pole. A method of manufacturing a main pole of a magnetic head, characterized in that: