JPS61283013A - Vertical magnetic recording and reproducing head - Google Patents

Abstract

PURPOSE:To improve the recording and reproducing efficiency by installing a nonmagnetic protection film having the same wear resistance as that of a main magnetic pole between said pole and the nonmagnetic tip part of each sub-member forming a medium facing surface in the vicinity of the main magnetic pole. CONSTITUTION:On a vertical magnetic head, the nonmagnetic protection films 6 and 6' having the same wear resistance as that of the main magnetic pole 1 lies between the nonmagnetic materials 4 and 4' of the sub-members 2 and 2' forming medium facing surfaces in the vicinity of the mainmagnetic pole 1. Accordingly the thickness of the main magnetic pole comes to a value available from adding the main magnetic pole 1 to the protection films 6 and 6', and due to mechanical strength against wear, chipping the main magnetic pole 1 is substantially reduced. As a result the sinking phenomenon of the main magnetic pole 1 is suppressed to reduce spacing between recording media, and therefore the recording and reproducing efficiency is remarkably improved. Moreover the protection films 6 and 6' are provided only on the nonmagnetic members 4 and 4' in order to strengthen the magnetic bonding of the sub- members 2 and 2' with respect to magnetic parts 3 and 3'.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a perpendicular magnetic recording/reproducing head C used in a perpendicular magnetic recording/reproducing method for recording information perpendicularly to the in-plane direction of a recording medium. (referred to as a perpendicular magnetic head).

C) Conventional technology Traditionally, magnetic recording has used a method of recording signals in the longitudinal (in-plane) direction of the recording medium using a ring-type hept, but in such a longitudinal recording method, the recording wavelength becomes shorter. C: Since the self-demagnetizing field increases over time, there is a natural limit to high-density magnetic recording. For this reason, a perpendicular magnetic recording system has been proposed in which the self-demagnetizing field becomes smaller as the recording wavelength is shortened, and the perpendicular magnetic heads used in such a system are being improved day by day in order to realize high-density recording. and.

Recently, main pole excitation type perpendicular magnetic heads have been in the spotlight, and such main pole excitation type perpendicular magnetic heads have a soft magnetic head, as shown in, for example, Japanese Patent Laid-Open No. 58-153216. A main magnetic pole made of a magnetic thin film is magnetically connected to the main magnetic pole by a pair of auxiliary members each having an auxiliary magnetic pole section to be joined and a return bus section serving as a return bus for the magnetic flux of this main magnetic pole. It is constructed by being held in place from both sides.

However, in such a perpendicular magnetic head, the return bus portion of each auxiliary member does not directly face the recording medium, resulting in a large spacing loss with respect to the recording medium. Therefore, we decided to make the return path directly facing the recording medium as shown in Figure 8 (
: A perpendicular magnetic head as shown has also been proposed, (1)
is a main magnetic pole made of a soft magnetic thin film, (2+(2) is a pair of auxiliary members that sandwich the main magnetic pole (11) from both sides, and the surface of each auxiliary member (2) is magnetically connected to the main magnetic pole (1). The auxiliary magnetic pole part (3a) (3a) and the main magnetic pole part (3a) to which the winding is applied are joined.
The return path portion (3b
)(3b),! f A magnetic material part (31 (31) and this magnetic material part (3) in which grooves (3c) and (3o') are formed
(31 return path part (3b) (3b) and main magnetic pole (1
A non-magnetic material part (4H4
It consists of 1. Note that (5) is a recording medium.

e→ Problems to be Solved by the Invention However, even in the above-mentioned perpendicular magnetic head, magnetic recording regurgitation occurs on, for example, magnetic tapes and disks.

Special C, when the film thickness of the main magnetic pole fi+ is 1 μm or less (: is,
The above chipping caused the main magnetic pole film to cave in, creating a spacing between the C2 recording medium (5) and the main magnetic pole (1) as shown in Figure 9, which led to a deterioration in recording and reproducing efficiency. .

) measures to resolve the problem; The present invention aims to solve the above-mentioned problems.

In a perpendicular magnetic recording/reproducing head in which a main magnetic pole made of a soft magnetic thin film is sandwiched from both sides by a pair of auxiliary members having an auxiliary magnetic pole part and a return path part, a medium contacting surface is formed around the main magnetic pole. fN between the non-magnetic tip of each auxiliary member and the main magnetic pole.

A non-magnetic protective film having wear resistance comparable to that of the main pole is provided.

(e) Production The above-mentioned protective film of the perpendicular magnetic head of the present invention is as follows.

Substantially increases the thickness of the main pole in terms of wear resistance.

It acts to suppress the depression phenomenon of the main magnetic pole.

(f) Example An embodiment of the present invention will be described below with reference to the drawings.

Incidentally, the same parts as those in the prior art are given the same drawing numbers, and the explanation thereof will be omitted.

That is, in the perpendicular magnetic head of the present invention, the non-magnetic material portions (4) (4) of each of the auxiliary members (2) (2) forming the medium contacting surface around the main pole (11) and the main pole (1) A non-magnetic protective film (61 (6)) having wear resistance comparable to that of the main pole (11) is interposed between the main magnetic pole (11).

Therefore, in the perpendicular magnetic head of the present invention, from the viewpoint of abrasion, the thickness of the main pole is the same as that of the main pole (1) and the protective film (6).
The thickness of the main magnetic pole (1) (2) is increased, and the chipping at the main magnetic pole (1) (2) is significantly reduced.As a result, the chipping at the main magnetic pole (1) (2) is significantly reduced. By reducing the spacing between the recording medium and the recording medium, the recording and reproducing efficiency is significantly improved.In addition, in the present invention, each auxiliary member (2) magnetic part (31 (3) magnetic coupling between Next, a method for manufacturing the perpendicular magnetic head of the present invention will be described with reference to FIGS. lfgA to FIG. 7.

First, as shown in FIG. 3, a corner of a magnetic material block αO made of Mn-Zn ferrite, N1-Zn ferrite, etc. is grooved to form a groove r11) for glass filling. (111 is further grooved to form a winding groove α2. Then, a glass block housing 3 is welded to the glass filling groove (11) of the magnetic material block α1 obtained in this way. After obtaining a composite block as shown in Fig. 4, the joint surface side is slope-polished and a Ti film α4 of approximately 20 μm thick is formed on the polished surface by high-frequency sputtering (see IS diagram). The polished surface side of the composite block was polished perpendicularly to the welded surface of the magnetic material block αυ and the glass block αj until it was in contact with the glass block α3C, and the polished surface was cleaned by a reverse sputtering method, and then cleaned by a high frequency sputtering method. A 0O-Zr amorphous film a51 with a thickness of 5 μm is formed (this may be partially formed using a metal mask having slits), and a Ti film with a thickness of about 20 μm is further formed thereon by high-frequency sputtering. (See Figure 6) Then, perform slope polishing as shown in Figure 7 in the opposite direction to the initial slope polishing, and then attach the composite block shown in Figure 4 after slope polishing. After cutting to a width, the perpendicular magnetic head of the present invention as shown in FIG. 1 can be obtained by performing external processing such as thickness polishing and rounding.

(G1. Effects of the Invention As described above, in the perpendicular magnetic head of the present invention, the distance C between the non-magnetic tip portion of each auxiliary member forming the medium contacting surface around the main pole and the main pole is the same as that of the main pole. Since a non-magnetic protective film with wear resistance of It is possible to significantly improve recording and reproducing efficiency by reducing spacing loss.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the perpendicular magnetic head of the present invention. FIG. 2 is an enlarged view of part B, FIGS. 3 to 7 each show the manufacturing process, and FIG. 3 is a perspective view showing the process of forming the groove for glass filling (the second winding). Figure 4 shows the process of welding a glass block to a magnetic material block, and Figure 5 shows the process of forming a Ti film after performing slope polishing on the block shown in Figure 4. A diagram showing the process of forming a main pole and one film on the main pole after surface polishing on the one shown in the figure, and a diagram showing the process of forming one film on the main pole and the one in Figure 6. Figure 8 is a diagram showing the process of applying slope polishing to the one in Figure 6. Figure 9 is an enlarged view of part A. Steel part, (6) f6)...protective film.

Claims (2)

[Claims] (1) In a perpendicular magnetic recording/reproducing head in which a main magnetic pole made of a soft magnetic thin film is sandwiched from both sides by a pair of auxiliary members having an auxiliary magnetic pole part and a return bus part, the medium contact surface around the main magnetic pole A perpendicular magnetic recording/reproducing head characterized in that a nonmagnetic protective film having wear resistance comparable to that of the main magnetic pole is provided between the nonmagnetic tip portion of each of the auxiliary members forming the main magnetic pole and the main magnetic pole. (2) The perpendicular magnetic recording/reproducing head according to claim 1, wherein the protective film is made of a non-magnetic metal film such as Ti.