JPH0480444B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a perpendicular magnetic recording/reproducing head (hereinafter referred to as (referred to as a perpendicular magnetic head).

(b) 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 head, but in such a longitudinal recording method, the recording wavelength becomes shorter. As the self-demagnetizing field increases, 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 recording at shorter wavelengths is performed, and the perpendicular magnetic heads used in such a system are being improved day by day in order to realize high-density recording. Recently, main pole excitation type vertical magnetic heads have been in the spotlight, and such main pole excitation type perpendicular magnetic heads are made from soft magnetic thin films, as shown in Figures 12 and 13, for example. A pair of auxiliary members 4, whose tip portions are made of non-magnetic material portions 2, 2' and the remaining portions are made of magnetic material portions 3, 3'.
4', and the magnetic material parts 3, 3' have a groove part 3 for the winding 5 separating the auxiliary magnetic pole parts 3a, 3a' and the return path parts 3b, 3b'.
c and 3' are formed respectively (Japanese Patent Application Laid-open No. 1983-
(Refer to Publication No. 153216).

(C) Problems to be Solved by the Invention However, as can be seen from the front (i.e., the side facing the medium) of such a perpendicular magnetic head with the non-magnetic material portions 2, 2' removed, Since there is a considerable distance between the main magnetic pole 1 and the return path sections 3b and 3'b, the return path efficiency of the magnetic flux flowing from the main magnetic pole 1 to the return path sections 3b and 3'b is poor, and furthermore, the return path section 3b and 3'b Since the head is arranged only in the longitudinal direction of the head (medium transport direction), it cannot pick up the magnetic flux flowing from the main magnetic pole 1 in the thickness direction of the head (track direction). There was a problem that the effect of the return path was not fully utilized.

(d) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a main magnetic pole made of a soft magnetic thin film, an auxiliary magnetic pole part that is magnetically joined to the main magnetic pole, and an auxiliary magnetic pole part that is magnetically joined to the main magnetic pole. In a perpendicular magnetic head that is sandwiched from both sides by a pair of auxiliary members, each of which has a return path portion that serves as a return path for magnetic flux, the return path portion of each of the auxiliary members faces directly toward the recording medium. The medium-contacting surface is extended in the direction of the main magnetic pole, and the main magnetic pole is surrounded by a non-magnetic material.

(e) Effect As described above, the return path portion of the perpendicular magnetic head of the present invention has its medium contacting surface side close to the main magnetic pole and surrounds the main magnetic pole, so that the magnetic flux emitted from the main magnetic pole is transferred to the medium. It picks up efficiently not only in the direction but also in the track direction, and acts to fully exhibit the return path effect.

(f) Embodiment An embodiment of the present invention will be described below with reference to the drawings. That is, the perpendicular magnetic head of the present invention is constructed as shown in FIG. 1, where 6 is a main magnetic pole made of a soft magnetic thin film deposited thereon, and 7 and 7' are a pair of main magnetic poles that sandwich the main magnetic pole 6 from both sides. The auxiliary members 7, 7' have auxiliary magnetic pole parts 8a, 8'a, return path parts 8bb,
Holes 8c and 8'c for the winding 9 are formed to separate the winding 9 from the winding 8'b. and each of the auxiliary members 7,
7' non-magnetic material parts 10, 10' are return path part 8
b, 8'b are the main magnetic pole 6 and the auxiliary magnetic pole part 8a,
It is made so that it is not directly magnetically joined to 8'a. In particular, in the perpendicular magnetic head of the present invention, the return path portions 8b and 8'b of each of the auxiliary members directly face the recording medium side to form a medium contacting surface, and the medium contacting surface side is as shown in the figure. It extends in the direction of the main magnetic pole 6 and surrounds the main magnetic pole 6.

Therefore, in the perpendicular magnetic head of the present invention, the return path portions 8b and 8'b can sufficiently pick up the magnetic flux emitted from the main magnetic pole 6 not only in the medium transport direction but also in the track direction with a small inter-medium spacing. This improves the recording and reproducing efficiency. For example, a conventional head of the present invention head H having the above structure
A comparison of the reproduction output with H' is shown in FIG. 3, and it can be seen that the head of the present invention is significantly superior.

Next, a method for manufacturing the perpendicular magnetic head of the present invention will be explained with reference to FIGS. 4 to 11.

First, a flat magnetic material 11 made of Ni--Zn ferrite or the like and a flat non-magnetic material 12 made of glass or the like are alternately stacked and bonded as shown in FIG. 4 to obtain a laminated block. A flat non-magnetic material 13 made of glass or the like is then bonded to the top surface of the laminated block thus obtained.
It is bonded onto a rectangular parallelepiped magnetic material block 14 made of Ni--Zn ferrite or the like to obtain a composite block 15 as shown in FIG. 6, and this composite block 15 is sliced at predetermined intervals as shown in FIG. A bonded block 16 is obtained.

Next, grooves are formed on one side 17a of the rectangular parallelepiped magnetic material block 17 made of Ni--Zn ferrite or the like to form a winding groove 17b and a return path 17c. Then, like this, the groove 17b
One side 17a of the magnetic material block 17 formed with
After mirror-polishing the side as a joint surface, the above-mentioned joining block 16 is joined from one mirror-polished side as shown in FIG. 8, and then the other side is also mirror-polished as shown in FIG. A first half block 18 is obtained. Furthermore, a Co-Zr based (for example, Co-Zr-Nb, etc.) amorphous thin film is deposited on the other side of the mirror-polished joint surface of the first half block 18 by sputtering or the like. After forming, the main pole 19 is photo-etched to have a desired track width, thereby obtaining a second half block 20 as shown in FIG. Here, even without using photoetching, a main pole with a desired track width can be fabricated by performing vapor deposition or sputtering using a mask having slits with a desired track width. Then, by butting and joining the second half block 20 and the first half block 18 obtained in this way, a main body block 21 as shown in FIG. 11 is obtained.
1 is sliced to the required width from the point indicated by the chain line, polished to a desired thickness, processed to shape the tip (rounded, etc.), and then wound into a wire as shown in Figures 1 and 2. A head equivalent to the perpendicular magnetic head of the present invention is obtained.

(G) Effects of the Invention As described above, the perpendicular magnetic head of the present invention has the return path portions of the pair of auxiliary members that sandwich the main pole facing directly toward the recording medium, and forms a medium contacting surface. Since the medium contacting surface side is extended in the direction of the main magnetic pole and the main magnetic pole is surrounded by a non-magnetic material, the spacing between the recording medium and the return path section can be reduced. , the magnetic flux emitted from the main pole can be efficiently picked up not only in the medium transport direction but also in the track direction. Therefore, the return path effect of the return path section can be fully utilized, and the recording and reproducing efficiency can be improved.

[Brief explanation of the drawing]

1a and 1b are respectively a front view and a plan view of the perpendicular magnetic head of the present invention, FIG. 2 is a perspective view of FIG. Figures 4 to 11 show the playback output characteristics of
The figures each show the manufacturing process. FIG. 4 is a perspective view showing the process of obtaining the laminated block, FIG. 5 is a perspective view showing the process of joining the non-magnetic material to the magnetic material block, and FIG. 6 is the composite block. FIG. 7 is a perspective view showing the process of obtaining a joined block, FIG. 8 is a perspective view showing the process of obtaining the first half block,
FIG. 9 is a perspective view showing the first half block;
Figure 0 is a perspective view showing the second half block;
The figure is a perspective view showing the main body block, Figures 12a and b
are respectively a front view and a plan view of a conventional vertical magnetic head;
FIG. 13 is a perspective view of FIG. 12b viewed from line A-A'. 6... Main magnetic pole, 7, 7'... Auxiliary member, 8b,
8'b... Return path section, 10, 10'... Non-magnetic material section.

Claims (1)

[Claims] 1. A main magnetic pole made of a soft magnetic thin film is supported on both sides by a pair of auxiliary members each having an auxiliary magnetic pole part that is magnetically joined to the main magnetic pole and a return path part that serves as a return path for the magnetic flux of this main magnetic pole. In the perpendicular magnetic recording/reproducing head, the return path portions of each of the auxiliary members directly face the recording medium side and form a medium contacting surface, and
1. A perpendicular magnetic recording/reproducing head characterized in that its medium-contacting surface side extends in the direction of the main magnetic pole and is configured to surround the main magnetic pole with a non-magnetic material interposed therebetween.