JPS6313246B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head for perpendicular magnetic recording used in a perpendicular magnetic recording method in which writing is performed in the perpendicular direction of a magnetic recording medium.

Compared to conventional magnetic recording systems, perpendicular magnetic recording systems are attracting attention around the world as they have the potential for higher density recording. One of the problems in putting this perpendicular magnetic recording system into practical use is the magnetic head. It is difficult to write at high density with the leakage field type head used in the conventional recording system as shown in FIG. A head having a structure in which a soft magnetic material 21 is arranged and a thin plate-like soft magnetic material 23 is arranged on the recording surface side has been proposed.

The present inventors have improved the thin film-like soft magnetic material portion 23 shown in FIG. 2 to steepen the magnetic flux distribution from the block-like soft magnetic material 21 to the thin plate-like soft magnetic material 23.
This enabled higher-density recording.

An object of the present invention is to provide a magnetic head for perpendicular magnetic recording that enables higher density recording.

According to the present invention, in a magnetic head for perpendicular magnetic recording that performs writing in the direction perpendicular to the surface of a magnetic recording medium, the tip of the side surface of the soft magnetic material of the magnetic head perpendicular to the running direction of the magnetic recording medium is This is achieved by providing a magnetic head for perpendicular magnetic recording, which is characterized by attaching a highly conductive metal.

That is, when a highly conductive metal 33 is attached to the tip of the thin plate-like soft magnetic material portion 31 on a surface perpendicular to the running direction of the magnetic recording medium as shown in FIG. When passing, an eddy current is generated in the metal 33 and cancels the passing magnetic flux.
That is, as shown in FIG. 3, a thin plate-like soft magnetic material 3
By attaching a highly conductive metal 33 to the tip of the thin plate-like soft magnetic material 31, the magnetic flux enters only from the magnetic recording medium facing surface 32 of the thin-plate soft magnetic material 31, and the magnetic flux distribution to the tip of the thin soft magnetic material 31 is changed. become steeper.

Hereinafter, the present invention will be explained in detail with reference to Examples.

Example 1 A copper plate with a thickness of c10 μm is attached as shown in Fig. 3 to a thin plate-like soft magnetic material 31 with a thickness of a 2.5 μm and a width b of 2 mm, and this and the block-shaped soft magnetic material are arranged as shown in Fig. 2. I used it to write on magnetic tape. For reading, a leakage field type head with a gap length of 0.2 μm was used.

The results are shown by solid line 42 in FIG. Although FIG. 4 is a logarithmic graph, the numbers on both the vertical and horizontal axes are not shown as logarithmic values. A dotted line 41 in FIG. 4 indicates the readout output of a magnetic tape written using a magnetic head having the shape shown in FIG. 2 without a copper plate attached to a thin soft magnetic material. The thin plate-like soft magnetic material used for writing to obtain the dotted line 41 is the solid line 42 except for the presence or absence of the copper plate.
It is exactly the same as the thin plate-like soft magnetic material used to obtain .

From FIG. 4, it can be seen that if a thin plate-like soft magnetic material is used in which a highly conductive metal is attached to the tip of the surface perpendicular to the running direction of the soft magnetic magnetic recording medium as shown in FIG. Compared to the case of using a thin plate-like soft magnetic material that is not attached, higher output can be obtained in a high recording density region.

The above examples were carried out to confirm the principle of the present invention. As a practical magnetic head for perpendicular magnetic recording, the above-mentioned thin plate-like soft magnetic material 3 is used.
1 has a thickness a of 0.1 to 0.3 μm and a width b of 5 to 100 μm. In the perpendicular magnetic recording system, the thickness a of the thin plate-like soft magnetic material is related to the magnetic recording density, and together with the effects of the present invention, higher density recording can be achieved.

As a method for attaching the highly conductive metal to the thin plate-like soft magnetic material, in addition to pasting, any method such as vapor deposition, plating, sputtering, etc. may be used.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a leakage field type head used in conventional magnetic recording, FIG. 2 is a diagram showing a magnetic head used in perpendicular magnetic recording, and FIG. 3 is a diagram showing a magnetic head used in perpendicular magnetic recording according to the present invention. FIG. 4 is a diagram showing a thin plate-like soft magnetic material for a head (attached to a highly conductive metal), and FIG. 4 is a diagram showing a read output of a magnetic tape recorded using the magnetic head according to the present invention and the magnetic head of FIG. 11... Head core, 23, 31... Thin plate-like soft magnetic material, 12, 22... Coil, 21... Block type soft magnetic material, 24... Magnetic recording medium, 33...
Good conductive metal.

Claims (1)

[Claims] 1. In a magnetic head for perpendicular magnetic recording that performs writing in a direction perpendicular to the surface of a magnetic recording medium, a highly conductive metal is attached to the tip of the side surface of the soft magnetic material of the magnetic head perpendicular to the running direction of the magnetic recording medium. Features of a magnetic head for perpendicular magnetic recording.