JPH0410207A - Thin film magnetic head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 【overview】

Regarding thin-film magnetic heads, the aim is to provide a thin-film magnetic head in which the influence of crosstalk is small even when the track pitch is narrowed, and a pair of magnetic fluxes is installed on both sides of the recording/reproducing magnetic pole at the same pitch as the track pitch of the magnetic storage medium. The absorption layer is formed of a magnetic material, and the magnetic flux absorption layer is

[Industrial application field]

The present invention relates to thin film magnetic hends. In recent years, as the capacity of auxiliary storage devices has increased, improving the recording density of magnetic storage media such as magnetic disks has become an important issue. Such an improvement in storage density is achieved by increasing the linear recording density in the circumferential direction of the recording medium and the track density in the radial direction.
It is necessary to take into consideration problems such as a decrease in reproduction output due to narrowing of the track pitch or crosstalk from adjacent tracks.

[Conventional technology]

Conventional thin film magnetic heads are constructed by forming read/write magnetic poles on a substrate such as ceramic.

[Problem to be solved by the invention]

However, in the above conventional example, when the dead space formed between adjacent tracks is narrowed for the purpose of improving track density, the dead space is reduced below a certain value due to the influence of crosstalk from adjacent tracks. Therefore, there was a limit to the improvement of trunk density. The present invention has been made in view of the above points, and it is an object of the present invention to provide a thin film magnetic head that is less affected by crosstalk even when the trunk pitch is narrowed.

[Means to solve the problem]

FIG. 1 shows the principle of the present invention, and shows a thin film magnetic head seen from the magnetic storage medium 2 side and a track T of the magnetic storage medium 2 corresponding to this thin film magnetic head. Reference numeral 1 denotes a recording and reproducing magnetic pole consisting of an upper magnetic pole 4 and a lower magnetic pole 5, and 3 a magnetic flux absorbing layer formed of a magnetic material and provided adjacent to the recording and reproducing magnetic pole 1. The magnetic flux absorption layer 3 is M! for recording and reproduction. are provided on both sides of the recording/reproducing magnetic pole 10 so as to sandwich the pole 1, and are connected to each other at the inner layer. Furthermore, the recording/reproducing magnetic pole 1 and the pair of magnetic flux absorbing layers 3.3 are arranged at the same pitch as the track pitch of the corresponding magnetic storage medium 2, and the magnetic flux absorbing layer 3 is the magnetic flux absorbing layer 3 of the recording/reproducing magnetic pole 1. It is arranged to face directly the tracks T2 and T3 adjacent to the track T1 to be read.

[Effect]

Based on the above configuration, the magnetic flux from the track T1 corresponding to the recording/reproducing magnetic pole 1 is supplied to the gap 6 formed by the upper magnetic pole 4 and the lower magnetic pole 5, and the magnetic recording of the track TI is read. At this time, the magnetic flux from the adjacent trunks T2 and T3, which causes crosstalk, is absorbed by the mutually connected magnetic flux absorption layer 3 and circulates. As a result, the magnetic pole 1 for recording and reproducing is located at the adjacent tracks T2, T.
Since it is no longer affected by the magnetic flux from 3, the punt space 7 can be made narrower.

【Example】

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is a back view showing an embodiment of the present invention, and 8 in the figure is a head body made of a ceramic material such as alumina-titanium carbide. In the central part of the head body 8 in the direction along the trunk T of the magnetic storage medium 2,
A recessed groove 9 for floating is provided. Further, at the rear end of the head body 8, two sets of recording/reproducing magnetic poles 1.1 are formed by a thin film process. The recording/reproducing magnetic pole 1 has an upper magnetic pole 4 and a lower magnetic pole 5 arranged opposite each other, and as shown in FIGS. 3 and 4,
After layering and flattening alumina 1'ill on the ceramic substrate 10, a magnetic material such as permalloy is layered to form the lower magnetic pole 5, and then an alumina layer 12 with a thickness corresponding to the width of the gear knob 6 and an insulating layer are formed. Upper magnetic pole 4 via layer 13
It is composed of the following. Further, the upper magnetic pole 4 and the lower magnetic pole 5 are connected at the terminal end, and in cross-sectional view, are formed in a loop shape with a gap 6 as an opening, and the magnetic flux circulating through these upper and lower magnetic poles 4.5. An induction coil 14 made of a copper material is formed as a thin film at the position where the coil is wound. On the other hand, the magnetic flux absorption layer 3 is formed of a magnetic material such as permalloy adjacent to the recording/reproducing magnetic pole 1, and the distance between the magnetic flux absorbing layer 3 and the recording/reproducing magnetic pole 1 is approximately equal to the dead space 7 between the tracks T. As a result, the recording/reproducing magnetic pole 1 directly faces the opposing track T1 and the adjacent tracks T2 and T3. Further, these magnetic flux absorption layers 3 are connected to each other at their terminal ends, as shown by broken lines in FIG. 4, and constitute a return path for magnetic flux from the adjacent tracks T2 and T3. In FIG. 3, reference numeral 15 indicates an alumina layer for protecting the recording/reproducing magnetic pole 1 and the like.

【Effect of the invention】

As is clear from the above explanation, according to the thin film magnetic head according to the present invention, the magnetic flux from the adjacent trunk can be absorbed by the magnetic flux absorbing layer, so it is possible to narrow the dead space, and the magnetic storage The storage density of the medium can be improved.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a diagram showing an embodiment of the present invention; Figure 3 is a sectional view taken along line A-A in Figure 2; FIG. 4 is a view taken in the direction of arrow B in FIG. 3. In the figure, 1 is a recording/reproducing magnetic pole; 2 is a magnetic storage medium; 3 is a magnetic flux absorption layer; T is trunk. ttnl+1ff4*i

Claims (1)

[Claims] A pair of magnetic flux absorbing layers (3) on both sides of the recording/reproducing magnetic pole (1) at the same pitch as the track pitch of the magnetic storage medium (2).
is formed of a magnetic material, and the magnetic flux absorption layer (3
) are connected by a thin film inner layer.