JPS59142719A - Thin-film head - Google Patents

Abstract

PURPOSE:To prevent a magnetic pole from sending magnetic flux from an adjacent track and to reduce crosstalk by arranging another magnetic film near the tip of the magnetic pole. CONSTITUTION:An U-shaped coil 13 which is symmetrical about magnetic poles 11 and 12 made of ''Permalloy'' runs between both magnetic poles; and tips of the magnetic poles 11 and 12 have a gap 24 of about 0.5-1mum width in the moving direction of a recording medium and a magnetic field is applied to the gap 14 to perform horizontal recording on a track 16 of the recording medium 15. Two magnetic films 18 and 19 which have tips closely to the tips of the magnetic poles 11 and 12 at distances of about 1-2mum from the tip flanks of the magnetic poles 11 an 12 and are curved along the surface of the recording medium 15 and the U-shaped coil 13 are arranged one over another. Thus, the magnetic films 18 and 18', and 19 and 19' are provided to absorb lateral leaking components of the magnetic field by the magnetic films.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a thin film head, and more particularly to a thin film head that reduces crosstalk from adjacent tracks.

(b) Background of the Technology In order to increase the recording density in magnetic recording, it is necessary to improve the recording medium, the head-medium gap, etc., but it is also important to improve the head. Thin-film heads have come to be used as heads suitable for high-density recording, replacing conventional heads using ferrite cores. Magnetization recording methods include a horizontal (in-plane) magnetization recording method in which recording is performed parallel to the medium surface, and a perpendicular magnetization recording method in which recording is performed in a direction perpendicular to the medium surface.

(C) Prior art and problems Conventionally, for example, in the horizontal magnetization recording method, as shown in FIG. Due to the magnetic field leakage 4, the magnetic field of the track 6 of the recording medium 5 expands to w8 (track expansion part 7), and during playback, the magnetic field senses the leakage magnetic field from the adjacent track 7&, causing The disadvantage was that the four strokes were larger.

On the other hand, in perpendicular magnetization recording using a main pole excitation type single-pole thin film head as disclosed by the present inventors in Japanese Patent Application No. 118525/1982, the magnetic field spread during recording is larger than in-plane recording. 9, the magnetization boundaries on the recording medium are more clearly defined, and therefore the boundaries between adjacent tracks are also more clearly defined. Therefore, there are fewer four strokes compared to horizontal recording, but
But not all of them exist.

(b) Object of the Invention In view of the above-mentioned drawbacks, an object of the present invention is to provide a thin film head for reducing the deviation from adjacent tracks in horizontal and perpendicular magnetic recording/reproducing systems.

(E) Structure of the Invention The object of the present invention is to include a magnetic film that faces a track adjacent to a track of a recording medium magnetically recorded via a magnetic pole and is disposed near the tip of the magnetic pole. This is achieved by the characteristic thin film head.

That is, the present invention is a method in which a magnetic film is newly provided in the thin film head of the conventional horizontal magnetization recording method and the perpendicular magnetization recording method.

In the present invention, the magnetic film preferably has a high magnetic permeability of about 1000 to 5000.

Furthermore, in the present invention, it is preferable that the magnetic film is provided symmetrically with respect to the central axis of the magnetic pole.

(f) Examples of the invention Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a schematic perspective view showing an embodiment in which the present invention is used in a horizontal magnetization recording system, No. 3-1-.

The figure shows a case where the present invention is used in a perpendicular magnetic recording system.
It is a schematic perspective view showing an example.

In FIG. 2, a symmetrical '&U-shaped coil 13 is disposed on a substrate (not shown) between a magnetic pole 11 and a magnetic pole 12 made of permalloy, for example, so as to pass through the magnetic pole. The tips of the magnetic poles 11 and 12 are provided with a gap (gap f) 14 having a width of about 0.5 to 1 μm in the direction of movement of the recording medium.
A magnetic field is applied to the gap 14 to perform horizontal recording on the track 16 of the recording medium 15. The width of the track is different from the width of the magnetic pole 11 or the magnetic pole 120. Approximately 1-72 μm from the side surfaces of the tips of magnetic poles 11 and 12 and the magnetic poles 11 and 1
Two curved magnetic films 18 and 19, each having a tip close to the tip of the magnetic layer 2 and along the surface of the recording medium 15 and the U-shaped coil 13, are arranged so as to be overlapped. Note that these two magnetic films are also bent at positions symmetrical to the magnetic poles 11 and 12 (magnetic films 18' and 19').

These magnetic films are preferably made of a magnetic material having high magnetic permeability, such as Hanoku Malloy, Sendust, or amorphous ferromagnetic material. By providing the magnetic films 18, 18' and 19, 19' in this way, the leakage of the magnetic field in the lateral direction is absorbed by the magnetic films. During reproduction, magnetic flux from an adjacent track is absorbed by a magnetic film provided close to and facing the adjacent track. Therefore, it is not absorbed by the magnetic pole of the head, and unnecessary voltage is not generated in the coil, thereby reducing cyclotalk.

According to FIG. 3, the head is of a single magnetic pole type for perpendicular magnetization recording, and as in the case of FIG. 2, a U-shaped coil is provided symmetrically around the magnetic pole 20. Perpendicular recording is performed from the tip of the magnetic pole 20 onto the track 16 of the recording medium 15. In FIG. 3, since there is only one magnetic pole, it is sufficient to arrange one magnetic film 21 and a magnetic film 21' symmetrically about the central axis of the magnetic pole. The position and shape of the magnetic film are the same as those shown in FIG. By providing such magnetic films 21 and 21', the magnetic flux from the adjacent tracks 16, 17a and 17b is absorbed by these magnetic films, so that unnecessary voltage caused by single magnetization is extremely small, and crosstalk is reduced. I will do it.

(G) Effects of the Invention As is clear from the above explanation, according to the present invention, by providing a new magnetic film near the tip of the magnetic pole, it is possible to prevent the magnetic pole from sensing magnetic flux from adjacent tracks. Therefore, it has the effect of reducing crosstalk.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view for explaining the prior art;
FIG. 2 is a schematic perspective view showing an embodiment in which the present invention is used in a horizontal magnetization recording method, and FIG. 3 is a schematic perspective view showing an embodiment in which the present invention is used in a perpendicular magnetization recording method. FIG. 1.2... Magnetic pole, 3... Gap, 4... Leakage of magnetic field in the lateral direction, 5... Recording medium, 6... Track, 7... Enlarged portion of track, 11 ,12.20...
Magnetic pole, 13... Coil, 14... Gap, 15.
...Recording medium, 16...Track, 17a, 17b.
...Adjacent tracks, 18.18', 19.19', 21
．． 21'...Magnetic film. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. The recording medium is characterized by comprising a magnetic film disposed near the tip of the magnetic pole and facing a track adjacent to the track of the recording medium that has been magnetized and recorded via the magnetic pole. thin film head. 2. The thin film head according to claim 1, wherein the magnetization recording is performed by a horizontal magnetization recording method. 3. The thin film head according to claim 1, wherein the magnetization recording is performed by a perpendicular magnetization recording method. 4. The thin film head according to claim 1, wherein the magnetic film is arranged symmetrically with respect to the central axis of the magnetic pole. 5. The thin film head according to claim 1, wherein the magnetic film is made of at least one selected from the group consisting of permalloy, sendust, and amorphous ferromagnetic material.