JPS58220243A - Production of vertically magnetized recording head - Google Patents

Abstract

PURPOSE:To obtain an auxiliary magnetic pole block which facilitates easy radius chamfer, by providing an adhesive layer between the auxiliary magnetic pole and a plate. CONSTITUTION:A ferrite block 8 is adhered to an L-shaped ceramic block 9 having a level difference (d) by changing the form of the block 9 or with intervention of a spacer so as to have a 30-100mum adhesive layer 13 that is provided between the blocks 8 and 9. Then adhered blocks 8 and 9 are cut into many T-shaped pieces. A ceramic block 10 having a level difference (e) and a groove 12 of the winding part formed previously and a ceramic block 11 having only the groove 12 of the winding part are adhered to both sides of a T-shaped piece. Then the surface of the T-shaped piece is ground and lapped into a prescribed form and a size to obtain an auxiliary block. The grinding/lapping characteristics are different between the auxiliary magnetic pole and the adhesive, and therefore the adhesive layer has a recess shape of 0.1-1mum to the auxiliary magnetic pole. As a result, the corner part of the auxiliary magnetic pole has an R-shape.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a perpendicular magnetic recording head that magnetizes a magnetic recording medium in the perpendicular direction (*body thickness direction) to record and reproduce information.

Conventionally, when recording signals on a magnetic recording medium, most of the recording has been done by using a ring-type magnetic head and using residual magnetization in the plane direction of the magnetic recording medium.

However, with this method, as recording density increases, the demagnetizing field within the medium increases, and there is a limit to high-density recording. On the other hand, in recent years, perpendicular magnetization method C using the magnetization mode perpendicular to the magnetic recording medium has been developed.
Publication No. a)) has been proposed. As shown in Fig. 1, the magnetic head applied to this method has a main pole (1) made of a magnetic thin film and an auxiliary pole (3) made of a thick magnetic film having a recording winding (2) facing each other. Recording medium 0)
It has been confirmed that a secondary side auxiliary pole excitation type magnetic head (Japanese Patent Application Laid-Open No. 53-32009), which performs magnetic recording by moving the main magnetic pole along the main pole, has excellent recording efficiency. If this method is applied when a recording medium is used on both sides, signals that should not originally be recorded may be recorded not only on the main magnetic pole side but also on the auxiliary magnetic pole side due to leakage magnetic flux from the auxiliary magnetic pole. , there was a problem of disturbing the already recorded signal.

This phenomenon occurs because the magnetic flux concentrates on the edge of the auxiliary pole.The magnetic material is applied to the surface of the auxiliary pole to increase the surface area, and the edge of the auxiliary pole is rounded to increase the magnetic flux. Methods have been devised to avoid concentration.

The present invention provides a method for manufacturing an auxiliary magnetic pole in a perpendicular magnetic recording head.

A further object of the present invention is to provide a manufacturing method for easily rounding the edge of an auxiliary magnetic pole in a perpendicular magnetic recording head.

According to the present invention, in a perpendicular magnetic recording head having an auxiliary magnetic pole block equipped with an auxiliary magnetic pole, the auxiliary magnetic block is sandwiched from both sides by blocks having grooves in the winding portion, and the block having a magnetic core is layered with an adhesive layer. A method for manufacturing a perpendicular magnetic recording head is obtained by providing a thickness of 30 to 100 .mu.m and gluing them together, and then grinding and slicing the medium facing surface into two pieces.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows an auxiliary pole block in one embodiment according to the invention.

The auxiliary magnetic pole block is made of magnetic material, and includes an auxiliary magnetic pole (5) around which the coil 7 is wound, and a plate (6) provided with the winding groove.
It is composed of. Auxiliary magnetic pole (5) and plate (6
) is an adhesive layer (3) using epoxy resin between the
It is 0 to 100 μm. This structure causes a difference in the grinding lap characteristics between the auxiliary magnetic pole and the adhesive, so the adhesive layer has a difference of 0.1 to
The corner portion of the auxiliary magnetic pole, which is concave by 1 μm, has an R shape. In this way, the R-shaped auxiliary magnetic pole corner part eliminates the concentration of magnetic flux, and the above-mentioned problem can be solved.

Next, a method of manufacturing the above-mentioned auxiliary magnetic pole block will be explained using FIG. 3. In Figure 3 (f), the thickness is 100μ
The ferrite blocks (8) before and after m have a step d and are 7'
(Adhesive layer (13) between L-shaped ceramic block (9)
) is 30 to 100 μm in ceramic block (
Adhesion is done by modifying the shape or inserting a spacer as described in 9).

The block is cut along the dotted lines shown in FIG. 3(f) to obtain a large number of T-shaped pieces. Of these, 10 is a ceramic block (10) in which the step 6 and the groove (12) in the winding part have been previously machined, and a ceramic block (11) in which only the groove (12) in the winding part has been machined. ) Adhere the resin as shown. As a result, as shown in the enlarged view of FIG. 00, the auxiliary magnetic pole block has an auxiliary magnetic pole end face and a resin portion whose surfaces are ground and lapped to a predetermined shape and dimension. The step and corner R shown in Fig. 30 vary depending on the ferrite material, the type of adhesive resin, the diamond abrasive grain size and load, and the adhesive layer thickness. For example, ferrite material: Ni -Zn ferrite, resin: epoxy resin (EC-1838), diamond abrasive grain size and load: 6 μm, 8 g/lj, L=40 μm
In this case, the recording problem at the corner of the auxiliary magnetic pole is improved by more than 10 dB when the step t is 0.6 μm and the corner R is 10 μm. The influence of the above-mentioned step and corner R is large depending on the adhesive layer thickness, and by increasing L, 6 and R also become large, but when t exceeds 1 μm, floating when used in a floating type. This is not desirable because it affects the characteristics.

Although this embodiment describes the case in which a large adhesive layer is provided at both ends, the same manufacturing method can also be applied to a case where a similar adhesive layer is provided only at one end.

In accordance with the present invention, as explained above, by providing a layer of 30 to 100 μm between the auxiliary magnetic pole and the plate and adhering it, and then grinding and lapping the interface, the corners of the auxiliary magnetic pole can be easily chamfered into 8 chamfers. This has the effect of solving the problem and manufacturing heads at low cost.

[Brief explanation of the drawing]

(Figure 1 is a diagram for explaining the perpendicular magnetization method according to the present invention, Figure 2 is a cross-sectional view showing an embodiment of the present invention, and Figure 3)
- FIG. 3 is a cross-sectional view and a partially enlarged view of a manufacturing process showing an embodiment of the present invention. 5... Auxiliary magnetic pole, 6... Plate, 7... Coil, 9, 10.11... Ceramic block, 8
... Ferrite block, 13 ... Adhesive layer, L ... Adhesive layer dimension, t ... Step, R ... Corner curvature Medium diameter. 61 1st Senmu 2 figure f/zu\Q'

Claims (1)

[Claims] In a perpendicular magnetic recording head, a main magnetic pole made of a magnetic thin film and an auxiliary magnetic pole wound with a wire to excite the main magnetic pole face each other with a magnetic recording medium in between, and record information on the magnetic recording medium. , sandwich the block that will become the magnetic core of the auxiliary magnetization from both sides with a block with grooves in the winding part to reduce the stiffness by 30 minutes.
A method for manufacturing a perpendicular magnetic recording head, characterized in that an auxiliary magnetic pole block is manufactured by providing and adhering an adhesive layer of ~100 μm, and grinding and lapping the surface.