JPH03686B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Application The present invention relates to a method of manufacturing a perpendicular magnetic head suitable for perpendicular magnetic recording and reproduction. In general, the perpendicular magnetic recording and reproducing method is suitable for high-density recording, and its applications include computer terminal devices such as magnetic disks and floppy disks, consumer video systems, and audio magnetic recording and reproducing devices. This reduces the size of the device,
High fidelity is expected. The perpendicular magnetic head used in such a perpendicular magnetic recording/reproducing system is mainly made of a magnetic thin film with high magnetic permeability (for example, permalloy, sendust, amorphous magnetic material, etc.), as shown in FIG. It is composed of a magnetic pole 1 and an auxiliary magnetic pole 2 made of a high magnetic permeability magnetic material (such as ferrite) arranged opposite to the main magnetic pole 1. Conventionally, the tip of the main magnetic pole 1 is connected to the magnetic recording medium 3. (For example, C _p C _r with the axis of easy magnetization perpendicular to the film surface
The thin film 3a is formed on a base 3b of polyester or the like by a high frequency sputtering method. By passing a signal current through the equipped recording/reproducing coil 4, a sharp perpendicular magnetic field is generated in the vicinity of the tip of the main magnetic pole 1, thereby perpendicular to the magnetic recording medium 3 (in this case, being moved in the direction of arrow A). I'm trying to record it. (b) Prior art The specific structure of the main magnetic pole is a high permeability magnetic thin film 1 made of permalloy, sendust, amorphous magnetic material, etc., as shown in the cross section of FIG.
is formed on one joining surface 7a side of a pair of auxiliary members 7, 7' made of a non-magnetic material 5, 5' such as glass and a high permeability magnetic material 6, 6' such as ferrite, and then this joining is performed. The main magnetic pole 8 is formed by making the bonding surface 7a' of the other auxiliary member 7' face the surface 7a and bonding the magnetic thin film 1 therebetween with an adhesive (e.g., epoxy resin). Ta. Here, the high permeability magnetic materials 6 and 6' are used to reduce the magnetic resistance of the main pole 8 and improve its recording and reproducing efficiency, and are provided on both sides of the magnetic thin film 1 except for the tip. The vertical magnetic field at the tip of the main magnetic pole 8 is not affected. (c) Problems Conventionally, no manufacturing method has been established for producing large quantities of such vertical magnetic heads (that is, those with the same shape and characteristics). (d) Object of the Invention The present invention proposes a manufacturing method suitable for mass production of such vertical magnetic heads, and the manufacturing method will be explained below with reference to FIGS. 3 to 9. (E) Example First, as shown in Fig. 3, for example, on one side,
A rectangular parallelepiped-shaped high magnetic permeability magnetic material 11 with a width W is indicated by a chain line, where a non-magnetic material 10 such as glass or ceramic is bonded (for example, bonded by a glass welding method, a glass infiltration method, an organic impregnation bonding method, etc.) That is, the cut block 12 having the required thickness t is obtained by cutting with a diamond cutter at intervals t so as to diagonally cross the joint surface. The cutting block 12
has cut surfaces on both sides, one of which has an acute-angled tip portion of the non-magnetic material 10, and the other cut surface has an obtuse-angled tip portion of the non-magnetic material 10. On the other hand, a rectangular parallelepiped-shaped auxiliary member 13 as shown in FIG.
(made of non-magnetic material such as glass or ceramic) A storage groove 14 with a width W and a depth t on the joint surface 13a side.
A plurality of bonding grooves 15 are cut (so-called groove processing) using a diamond cutter or the like (see FIG. 5). Then, as shown in FIG. 6 , the cutting block 12 obtained in FIG.
The cutting surface 12a of the cutting block 12 and the reinforcing member 13 are bonded so that one cut surface 12a having the acute-angled tip portion 10a of the non-magnetic material 10 facing the joining surface 13a of the auxiliary member 13 is embedded. After making the bonding surfaces 13a substantially the same plane, both surfaces are mirror polished to obtain the first half block 16 . Then, the cutting block 12 exposed on the joint surface 13a side of the first half block 16 obtained in FIG.
A high permeability magnetic thin film 17 made of permalloy, sendust, amorphous magnetic material, etc. is formed on the cut surface 12a of the block by high frequency sputtering, vapor deposition, etc. to form a second half block 18 as shown in FIG. get. And the second half block 18 made in this way
First, the first half blocks 16 on which no magnetic thin film is formed as shown in FIG. 6 are butted together from their joining surfaces 13a, and then the joining grooves 15 are filled with a joining agent 19 to join them. , a joining block 20 as shown in FIG. 8 is obtained. After that, such a joining block 2
0 is cut from the location indicated by the chain line in FIG. 8, that is, each cutting block is cut to a required head width l, and then the main pole 21 as shown in FIG. 9 is obtained. As described above, according to the present invention, the main magnetic pole 21 having the same cross-sectional structure as that shown in FIG. 2, that is, the same characteristics, can be provided with good mass productivity. (f) Application example Note that as a modification of the main magnetic pole 8 shown in FIG. 2, a main magnetic pole 8 ' having a cross-sectional structure as shown in FIG. The above-described method can also be applied to the method of manufacturing the magnetic head. That is, the second half block 18 shown in FIG. 7 has a joining groove 15 on the joint surface 13a side of the rectangular parallelepiped-shaped reinforcing member 13 shown in FIG.
After cutting the chisel and butting it together, you can carry out summer construction using the same process. (G) Effects As described above, according to the manufacturing method of the present invention, both sides of the high permeability magnetic thin film except for the tip are sandwiched between magnetic materials to reduce magnetic resistance and improve recording and reproducing efficiency. It is an industrially excellent product that can be mass-produced by improving the magnetic field, reinforcing the remaining tip part with non-magnetic material, and improving the sharpness of the perpendicular magnetic field. be.

[Brief explanation of the drawing]

Figure 1 is a diagram of the principle of perpendicular magnetic recording and reproducing system, Figure 2
The figure is a cross-sectional structural view showing the main pole of the vertical magnetic head according to the present invention, FIGS. 3 to 9 respectively show the manufacturing process thereof, FIG. Figures 5 and 5 are perspective views showing the groove machining process, respectively, and Figure 6 is the first step.
Fig. 7 is a perspective view showing the half block of
FIG. 8 is a perspective view of the main body block, FIG. 9 is a perspective view of the main magnetic pole with its outer shape processed, and FIG. 10 is another main magnetic pole according to the present invention. FIG. 12 ...Cutting block, 13...Reinforcing member, 1
4...Storage groove, 16 ...First half block, 17...Magnetic thin film, 18 ...Second half block, 20 ...Main block, 21 ...Main magnetic pole.

Claims (1)

[Claims] 1. A method for manufacturing a vertical magnetic head in which a main magnetic pole is constituted by sandwiching a magnetic thin film between a pair of auxiliary members at least whose tips are made of a non-magnetic material,
A magnetic material with a non-magnetic material bonded to one side is cut diagonally across the bonded surface at predetermined intervals, so that one of the cut surfaces on both sides has an acute angle at the tip of the non-magnetic material. a process of obtaining a cutting block having a section, a process of cutting a storage groove and a bonding groove on the joint surface side of the non-magnetic reinforcing member, and cutting the cutting block into the storage groove of the reinforcing member. The cutting block is buried so that the one cut surface faces the joining surface of the reinforcing member, and the one cutting surface of the cutting block and the joining surface of the reinforcing member are made substantially the same surface. Mirror polish the first
a step of forming a magnetic thin film on the cut surface of the cutting block exposed on the joint surface side of the first half block to obtain a second half block; A step of butting the joining surfaces of the first and second half blocks together and then filling the joining groove with a bonding agent to join them to obtain a main body block, and cutting the main body block into the required head width for each block. 1. A method for manufacturing a vertical magnetic head, which includes the steps of cutting the head with a machine and then processing the head into an external shape.