JPH03685B2 - - 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 recording medium 3 ( for example,
A C _p C _r thin film 3a having an axis of easy magnetization perpendicular to the film surface is formed on a base 3b of polyester or the like by high frequency sputtering), and the auxiliary magnetic pole 2 is placed on the opposite side ( In other words, a sharp perpendicular magnetic field is generated near the tip of the main magnetic pole 1 by passing a signal current through the recording/reproducing coil 4 which is wound around the auxiliary magnetic pole 2 and which faces the base side. (In this case, it is moved in the direction of arrow A) to perform perpendicular recording.

(b) Prior art As shown in Figure 2, the specific structure of the main magnetic pole in the past has been permalloy, sendust,
Main magnetic thin film 1 with high magnetic permeability made of amorphous magnetic material etc.
is formed on the bonding surface of one of the pair of auxiliary members 5, 5', and then the bonding surface of the other auxiliary member 5' is made to face this bonding surface, and the main magnetic thin film 1 is bonded therebetween. The main magnetic pole 6 was constructed by bonding and adhering with an agent (for example, epoxy resin). Here, only the tip portions of the auxiliary members 5, 5' are made of non-magnetic material 7, 7' such as glass, and the remaining portion reduces the magnetic resistance of the main pole 6 to improve recording and reproducing efficiency. High permeability magnetic material 8,
8' (for example, ferrite).

(c) Problems However, even in the main magnetic pole with this structure,
When the track width of the recording medium is narrowed in order to improve the recording track density, since the width W of the magnetic thin film 1 is set corresponding to the track width,
As the track width is narrowed, the width of the main magnetic pole 6 is also narrowed overall, and therefore the magnetic resistance is gradually increased. Therefore, a decrease in recording and reproducing efficiency due to the narrowing of the track has become a problem.

(d) Solution Therefore, the applicant has already proposed a main pole of a vertical magnetic head that has good recording and reproducing efficiency even when the track is narrowed, in Japanese Patent Application No. 57-45438. As shown in the figure, the rear width W' of the main magnetic thin film 1 with high magnetic permeability is set to be sufficiently wider than the track width with respect to the width W of the tip (corresponding to the track width), and the main magnetic thin film 1 is Similarly to the main magnetic thin film 1, the width of the rear end portion of the sandwiched auxiliary members 5, 5' made of high magnetic permeability magnetic materials 8, 8' is set to a width W' that is sufficiently wider than the track width.
In addition, the main magnetic pole 9 is configured such that a part of its upper surface is formed into a narrow protruding shape, and the width of the tip thereof, together with the non-magnetic materials 7 and 7', is a width W corresponding to the track width. be. In this way, the main magnetic thin film 1 and the auxiliary member 5 made of high permeability magnetic materials 8, 8',
By making the width of the rear end of 5' sufficiently wider than the track width to reduce magnetic resistance, the track width of the recording medium can be narrowed as the recording track density improves. However, it is possible to easily obtain a vertical magnetic head with low magnetic resistance, that is, high recording and reproducing efficiency.

(E) 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. 4 to 9.

(F) Example First, as shown in Fig. 4, for example, on one side,
A rectangular parallelepiped-shaped high magnetic permeability magnetic material 11 to which a non-magnetic material 10 such as glass or ceramic is bonded (for example, bonded by a glass welding method, a glass penetration method, an organic impregnation bonding method, etc.) is cut along a chain line using a diamond cutter or the like. The cut block 12 having the required thickness t is obtained by cutting from the location shown, that is, at intervals t, diagonally across the joint surface. The cutting block 12 has cutting surfaces 12a and 12b on both sides, and one of the cutting surfaces 12a is formed at the acute end portion 1 of the non-magnetic material 10.
0a, and the other cut surface 12b is a non-magnetic material 10
It has an obtuse end portion 10b. Then, one cut surface 12a side of this cutting block 12 is mirror polished to obtain a first half block 13 (see FIG. 5). Furthermore, a magnetic thin film 14 with high magnetic permeability made of permalloy, sendust, amorphous magnetic material, etc. is deposited on the mirror-polished cut surface 12a of the first half block 13 , which serves as a joint surface, by high-frequency sputtering. ,
A second layer as shown in FIG. 6 is formed by a method such as vapor deposition.
A half block 15 is obtained. Then, the first half block 13 on which no magnetic thin film is formed, as shown in FIG. 5, is joined to the second half block 15 obtained in this way by abutting it from the joining surface 12a side. , a joining block 16 as shown in FIG. 7 is obtained. Then, after cutting the bottom of the joining block 16 from the point indicated by the chain line using a diamond cutter or the like, cut a groove on the non-magnetic material 10 side, which is the tip, leaving a portion corresponding to the required track width W. 17 processing (for example, processing using diamond, ultrasonic horn, etc.) to obtain a main body block 18 as shown in FIG. Thereafter, the main body block 18 is removed from the point shown by the chain line in FIG.
After cutting at the required head width W', the 9th
As shown in the figure, if the side cutting process at the dashed line part and the cutting process on the tape contacting surface side, so-called external shape processing, are performed, the third
A main magnetic pole 9 as shown in the figure is obtained.

(g) Application example In this example, grooves are machined at the positions shown in Figure 8, but grooves can also be machined at the positions shown in Figure 10, and productivity will be improved by doing so. . Furthermore, although side cutting is performed during external processing as shown in FIG. 9, this can be omitted if the cutting thickness t is properly set in the process of obtaining the cutting block.

(H) Effects As described above, according to the manufacturing method of the present invention, a magnetic thin film is sandwiched between a pair of auxiliary members at least whose tips are made of a non-magnetic material, and the width of the tips of the auxiliary members is recorded together with the magnetic thin film. A vertical magnetic head is constructed by making the width of the rear end wider than the track width along with a magnetic thin film, corresponding to the track width of the medium.
It can be manufactured with good mass productivity and is industrially superior.

[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 perspective view showing the specific structure of the main pole of a conventional vertical magnetic head, FIG. 3 is a perspective view showing the main pole of a vertical magnetic head according to the present invention, and FIGS. 4 is a perspective view showing the process of obtaining the cut block, FIG. 5 is a perspective view showing the first half block, and FIG. 6 is a perspective view showing the second half block. , Fig. 7 is a perspective view showing the joint block, Fig. 8 is a perspective view showing the main body block, Fig. 9 is a perspective view showing the process of machining the external shape, and Fig. 10 shows the main body block in another embodiment. FIG. 12 ...cutting block, 13 ...first half block, 14...magnetic thin film, 15 ...second half block, 18 ...main block.

Claims (1)

[Claims] 1. A magnetic thin film is sandwiched between a pair of auxiliary members at least whose tips are made of a non-magnetic material, and the width of the tips of the auxiliary members is made to correspond to the track width of the recording medium together with the magnetic thin film, and the width of the rear end is set to match the track width of the recording medium. In a method of manufacturing a vertical magnetic head in which the main magnetic pole is made wider than the track width, a magnetic material with a non-magnetic material bonded to one side is placed at a predetermined interval so as to diagonally cross the bonded surface. a step of obtaining a cutting block in which one of the cut surfaces on both sides has an acute tip end portion made of a non-magnetic material; and mirror-polishing the one cut surface side of the cutting block; a step of obtaining a half block of
a step of forming a magnetic thin film on the mirror-polished cut surface of the first half block as a joint surface to obtain a second half block; A step of forming a groove on the non-magnetic material side, which is the tip end, leaving a portion corresponding to the required track width after joining the joining surfaces against each other to obtain a main body block, and forming the main body block in the groove portion. A method for manufacturing a vertical magnetic head, which includes the steps of cutting the head to a required head width and then processing the external shape.