JPS5812121A - Magnetic head - Google Patents

Abstract

PURPOSE:To reduce the cross talk which is produced from adjacent tracks, by providing a magnetic material insulated magnetically from a core at the outside of a gap and at the extended area of a gap butting line. CONSTITUTION:A monolithic type head forms a gap 3 between a core 4' and a slider 5. The core 4' and the slider 5 have a level difference at the vicinity of the gap 3, and a nonmagnetic material layer 6 is formed at the part of the level difference by a plating or adhering process. Then a magnetic material layer 7 which is isolated magnetically from the core 4' is formed in the layer 6 by a plating or adhering process. The layer 7 is set by bringing it close to the adjacent tracks 2 of a medium 1 and on the extended line and the same surface of the gap 3 of the core 4'. Thus the layer 7 masks magnetically the magnetic flux leaked out of the tracks 2 and reduces the cross talk to the gap 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head structure suitable for high track density recording and reproduction.

The magnetic heads installed in magnetic disk drives and the like are monolithic heads that integrate a core 4 and a slider 5, as shown in FIG. There are thin film heads and the like that have achieved miniaturization and low cost, as shown in Figure 3.

These magnetic heads have become more and more sophisticated in recent years, and the track density on magnetic recording media is also increasing.

These magnetic heads with higher track densities on magnetic recording media required narrower core widths.

However, monolithic head and thin film head IIi
As shown in FIG. 2 (6) and the third part, in the vicinity of the gap, as the distance T between the medium l and the adjacent track 2 becomes narrower, the crosstalk from the adjacent track 2 increases.
In addition, as the core width W of cores 4 and 8 becomes narrower, the reproduced signal decreases, resulting in the head having a signal-to-noise ratio (S/N) of 9, which greatly impedes information transmission. Was.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head that overcomes these conventional drawbacks.

Another object of the present invention is to provide a magnetic head in which crosstalk characteristics from adjacent tracks on a magnetic recording medium are reduced.

According to the present invention, in a magnetic head having a core constituting a magnetic recording/reproducing gap, a magnetic body magnetically insulated from the core is provided in a portion extending from a gear centering line outside the gap. A magnetic head having the following characteristics can be obtained.

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

FIG. 1 shows a monolithic magnetic head used in the @l embodiment of the present invention, and FIG. 2(c) shows the monolithic magnetic head shown in FIG. 1 cut along the X--X plane. In the monolithic head of the first embodiment, a gap 3 is formed between the core 41 and the slider 5 in FIG. 3(B). Here, the core 4'' and the slider 5 are provided with a stepped portion near the gap 3. A non-magnetic layer 6 is formed on this stepped portion by plating or adhesion.

Furthermore, a magnetic layer 7t is formed on this non-magnetic layer 6 by plating or adhesion so as to be magnetically separated from the core 4''. The magnetic layer 7 is provided close to the adjacent track 2 of the medium 1 on an extended line and on the same plane.Thereby, the magnetic layer 7 magnetically shields leakage magnetic flux from the adjacent track 2 and reduces crosstalk to the gap 3. let

Therefore, the monolithic magnetic head according to the first embodiment can reduce the crosstalk characteristics from adjacent tracks even when the track width is narrowed and the track density is increased, and even when the magnetic head approaches the adjacent tracks. Similarly, losstalk characteristics can be reduced by sleep.

Next, FIG. 4 shows a typical thin film head in a second embodiment of the present invention.

In FIG. 4, the second embodiment is a thin film magnetic head, in which a core 8 and a coil 11 are provided on a substrate 12, and a magnetic body 10 is further provided. The core 8 is formed with a gap 9t between the core 8a and the core 8b as shown in FIG. It is provided magnetically separated from the

This magnetic layer IO is a lower core 5a constituting the core 8.
When forming the t-layer, the lower magnetic layer 10a is formed at the same time.

Next, the upper magnetic layer 10b is formed simultaneously with the upper core 8b when the upper core 8b is formed after the gap 9 is formed using a non-magnetic material.゛In this way, the magnetic layer lO
is on the extension line of the gap 9 and on the same plane, and is positioned close to the adjacent track 2 of the medium 1 to magnetically shield leakage magnetic flux from the adjacent track 2 of the previous four companies. .

In addition, since this magnetic layer 10 can be formed at the same time as the core 8, it can be manufactured using the same manufacturing process and at the same price as the conventional one, and it has good crosstalk characteristics even when the track density is increased as in the first embodiment. A good rad can be achieved.

As explained above, by forming a magnetic layer magnetically separated from the core near the gap of the non-inventive core, a head with good crosstalk characteristics can be realized, and a thin film fca when applied to the head,
Increasing prices also has an effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a monolithic head used in the first embodiment of the present invention, @Figure 2 (5). (C) is an enlarged view showing the vicinity of the gap in the x-X cross section of Fig. 1 in the conventional method and the first embodiment of the present invention; Fig. 3;
FIG. 4 (5) is an enlarged view showing the vicinity of the gap of the conventional thin film head; @D is an enlarged view showing the vicinity of the gap of the thin film head in the second embodiment of the present invention. l...Magnetic recording medium, 2...Adjacent track, 3゜9...Gap portion, 4.8...-
・Core, 5...Slider, 6...Non-magnetic material, 7.10...Magnetic material, 11......Coil, 12...... substrate. Dice 1 crime U no (B)) 12 Separate

Claims (1)

[Claims] In a magnetic head having a core constituting a magnetic recording/reproducing gap, a gap abutment line t is formed outside the gap.
-Extend 1:, S and have a magnetic body magnetically insulated from the core, and t? Features a magnetic head.