JPS6233312A - Multi-channel vertical magnetic head - Google Patents

Abstract

PURPOSE:To improve the recording and reproducing efficiency by selecting the thickness of an auxiliary magnetic pole and a return path in the running direction of a recording medium both as 100mum or below and opposing magnetic members in the track direction of the recording medium. CONSTITUTION:The thickness of the auxiliary magnetic poles 3a1, 3a1' and 3b1, 3b1' and the return paths 3a2, 3a2' and 3b2, 3b2' is selected respectively as <=100mum to decrease the opposed surface area of the opposing magnetic members 3a, 3a'. Then the return paths surround the vicinity of main magnetic poles 1a, 1b from the three sides except a shield plate 8. In using the head like this to apply recording/reproduction simultaneously to two tracks, the recording/ reproduction is attained with a crosstalk of <=-25dB. Thus, the crosstalk between adjacent channles is reduced to improve the recording/reproducing efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a multi-channel perpendicular magnetic head used in a perpendicular magnetic recording/reproducing system.

(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-shaped 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 with a shorter wavelength 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, the main pole excitation type perpendicular magnetic head has been in the spotlight, and such a main pole excitation type perpendicular magnetic head is disclosed in, for example, Japanese Patent Laid-Open No. 153216/1983. A main magnetic pole made of a soft magnetic thin film is connected 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. It is constructed by holding it in place.

(c) Problems to be Solved by the Invention When making such a perpendicular magnetic head multi-channel, it is conceivable to interpose a non-magnetic plate and stack a plurality of such heads in the track direction of the recording medium. In such a head structure, crosstalk between auxiliary sections (constricted sections and return path sections) facing each other in the track direction increases, resulting in poor recording and reproducing efficiency.

B) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a plurality of main magnetic poles corresponding to each track of a recording medium, and a plurality of main magnetic poles provided corresponding to each of the main magnetic poles. A multi-channel perpendicular magnetic head comprising an auxiliary magnetic pole part and a return bus part, wherein the thicknesses of the auxiliary magnetic pole part and the return path part in the running direction of the recording medium are both 100 μm or less, and the thickness of the auxiliary magnetic pole part and the return path part in the running direction of the recording medium is They are arranged to face each other in the direction f.

(E) Function As described above, in the multi-channel perpendicular magnetic head of the present invention, the opposing surface area of the auxiliary magnetic pole portions and return path portions facing each other in the track direction of the recording medium is made as narrow as possible. Crosstalk between adjacent channels can be reduced.

(F) Embodiment A two-channel type perpendicular magnetic head will be described below as an embodiment of the multi-channel perpendicular magnetic head of the present invention.

That is, in Fig. 1, (x, A pair of auxiliary members, each auxiliary member (2aX2a)
and (2bX24) are the auxiliary magnetic pole part (3a+X3a1) and (3b+X3b°1) and the return bus part (3az
Magnetic materials (3a) (3=) and (31)
It is composed of non-magnetic materials (5a) (5,L) and (5bXsb) that form the medium contacting surface around the main magnetic poles (1a) (lb). In addition, (8aXSa) and ('bX6b) are winding holes, (7a) and (7b) are winding wires, and (8) is a shield plate made of a non-magnetic material.

In particular, in the perpendicular magnetic head of the present invention, the auxiliary magnetic pole part (3a1X
3a1) and (31) IX31N) and return bus section (
The thickness of the 3a2) (3a'z) and (3b2'') (3bx) portions are each 100- or less (i.e., in this case, the shield n(J-+') is 40 μm and the track width (12) is 60 μm.
While reducing the opposing surface area of the opposing magnetic materials (3a) (3=) by setting the auxiliary magnetic pole 1 (LtS) and the return path thickness (j4) to 40 ILm with respect to μm,
The return bus section (3az) (
3azX3bz) (3b'z) is the main magnetic pole (1aXlb)
Since the periphery is surrounded from three sides except for the shield plate (8) side, it is possible to significantly reduce crosstalk between adjacent channels and to fully utilize the return path effect, increasing recording and reproducing efficiency. improves. For example, when recording and reproducing two tracks simultaneously using these various heads of the present invention, it was found that recording and reproducing were performed with crosstalk of less than -25 dB.

Next, regarding the manufacturing method of the perpendicular magnetic head of the present invention,
This will be explained with reference to FIGS. 2 to 15.

First, a groove is formed on the side surface of a non-magnetic block (10) made of ceramic or the like, as shown in FIG. They are joined by a resin bonding method, etc., and then a magnetic material (a groove portion 02 for the winding wire is formed by grooving the part for use) is formed to obtain a joined block frame as shown in FIG. 4.

Next, a flat non-magnetic material 04 made of glass or the like and Ml-
Flat plate-like magnetic materials U+ made of Zn ferrite or the like are alternately stacked and bonded to obtain a similar laminated block gill as shown in FIG. As shown in FIG. 6, the thus obtained laminated block block is shaped into a rectangular parallelepiped made of Ni-Zn ferrite or the like with a flat non-magnetic material (+7) made of glass or the like bonded to the upper surface side. A magnetic material block (() is bonded onto a crosspiece to obtain a composite block 01 as shown in FIG. 7, and this composite block f is sliced at predetermined intervals as shown in FIG. 8 to obtain a cut block.

After the thus obtained cut block frame and bonded block frame are joined as shown in Fig. 9, they are cut from the point indicated by the dashed line, and a non-magnetic material such as ceramic is placed on the cut side. By joining 1), a 10th half block (4) as shown in FIG. 10 is obtained.Then, on one side of the first half block
After forming a Zr-based (e.g., Co-Zr-Nb, etc.) amorphous thin film by sputtering or the like, photoetching is performed to form the main magnetic pole with the desired track width, and the second half is formed as shown in FIG. Block (24 is obtained.Then, the second half-split block (24) obtained by this method and the first half-split block (n) are butted against each other and joined together to form a main body block (2()) as shown in FIG. ) is then sliced at predetermined intervals and wound to obtain a head chip hole as shown in Fig. 13.
After joining as shown in FIG. 14 through a shield plate made of non-magnetic material such as U, the tip shape is processed as shown by the dashed line to form the perpendicular magnetism of the present invention as shown in FIG. 15. A head equivalent to the head can be obtained.

(G) Effects of the Invention As described above, according to the present invention, there are a plurality of main magnetic poles corresponding to each track of a recording medium, a plurality of auxiliary magnetic pole parts provided corresponding to each of the main magnetic poles, and a return path. A multi-channel perpendicular magnetic head having a section, wherein the auxiliary magnetic pole section and the return path section both have a thickness of 100 μm or less in the running direction of the recording medium, and are arranged to face each other in the track direction of the recording medium. This reduces cross-over between adjacent channels and improves recording and reproducing efficiency.

[Brief explanation of the drawing]

m11&(a)(1)) are respectively a front view and a plan view of the perpendicular magnetic head of the present invention, FIGS. 2 to 15 respectively show the manufacturing process thereof, FIG. 2 is a diagram showing groove processing, and The figure shows the process of joining the magnetic material to the grooved part, Figure 4 shows the joining block, Figure 5 shows the laminated block, and Figure 6 shows the process of joining the non-magnetic material to the magnetic material block. Figure 7 is a diagram showing the composite block, Figure 8 is a diagram showing the process of obtaining a cut block, Figure 9 is a diagram showing the process of obtaining the first half block, and Figure @10 is a diagram showing the process of obtaining the first half block. Figure 5g11 shows the second half block, Figure 12 shows the main body block, Figure 13 shows the head chip, and Figure 14 shows the head chip stacking process. FIG. 15 is a diagram showing a state in which the tip shape processing has been completed. (1aX1b)...Main magnetic pole, (3atX3a1X3b
+X3b+)...Auxiliary magnetic pole part, (3azX3a'zX
3bzX3b'z) ”・Return path section, (8)...
・Shield plate.

Claims (1)

[Claims] (1) A multi-channel perpendicular magnetic head comprising a plurality of main magnetic poles corresponding to each track of a recording medium, and a plurality of auxiliary magnetic pole sections and return path sections provided corresponding to each of the main magnetic poles, respectively. The thickness of the auxiliary magnetic pole portion and the return path portion in the running direction of the recording medium are both 1.
1. A multi-channel perpendicular magnetic head characterized by having a diameter of 0.00 μm or less and facing each other in the track direction of a recording medium.