KR100256075B1 - Magnetic resistance head having high density in track - Google Patents

Abstract

PURPOSE: A magneto-resistance head for increasing track density is provided to minimize an interval between a recording gap and a reproducing gap, and to prevent reciprocal interferences in adjacent tracks, so as to perform a high density of recording in an information recording process and exactly reproduce recorded information. CONSTITUTION: A step difference(10) is formed in a gap of a share layer(9'). The thickness of the share layer(9') except the gap is thinner than thickness of a share layer(9) sharing a recording magnetic layer or a reproducing shield layer, to prevent deterioration of a recording density.

Description

Magnetoresistive head with increased track density

1 (a), (b), (c) and (d) are schematic diagrams for explaining the magnetoresistive head of the prior art.

2 (a) and (b) are schematic diagrams of main parts of a magnetoresistive head according to the present invention.

3 is a graph showing the change in track density according to the gap distance.

4 (a) and 4 (b) show magnetic field distribution depending on the shape of the recording layer.

* Explanation of symbols for main parts of the drawings

1 substrate 2 lower shielding layer

3: upper shielding layer 4: magnetoresistive element

5: insulating layer 6: lower magnetic layer

7: Upper magnetic layer S, S ′: gap distance

9,9 ′: shared layer 10: stepped portion

The present invention relates to a magnetoresistive head having an increased track density, and more particularly, between a recording gap and a reproducing gap constituting a magneto-induced / magnet-resistive composite thin film head used in a recording device such as an HDD, which is an auxiliary memory device for computers. By minimizing the intervals between the two tracks to prevent mutual interference in adjacent tracks to enable high-density recording and accurate reproduction of the recorded information.

In accordance with the trend of miniaturization, large capacity, and multifunctionalization of computers, the magnetic induction / magnetic resistance thin film head is one of the high density recording devices, and the demand layer is rapidly increasing in the art, and the composite thin film head shows the cross section and the side view thereof. As shown in FIG. 1 (a), (b), the magnetoresistive element MR 4 is formed in the regeneration gap between the lower shielding layer 2 and the upper shielding layer 3 formed on the substrate 1. The recording gap is formed between the lower magnetic layer 6 and the upper magnetic layer 7 on the insulating layer 5 formed on the upper shielding layer 3.

In the composite thin film head as described above, the recording of information is recorded in the recording gap between the upper magnetic layer 7 and the lower magnetic layer 6, and the reproduction of the recorded information is performed by the upper shielding layer 3 and the lower shielding layer 2. It is made by the magnetoresistive element 4 formed in the regeneration gap therebetween, but the recording gap is formed so as to be spaced apart by the predetermined distance "S" with respect to the regeneration gap, so that the recorded position and the reproduced position on the rotating disc during the driving of the head Since deviation occurs between positions, it is difficult to obtain accurate information and the recording density is relatively lowered. That is, as shown in FIG. 3 showing the change in track density according to the gap distance, on the graphs of the widths W1, W2, W3 of arbitrary magnetoresistive elements having a gap distance of 2 m, 3 m, and 4 m, respectively. The track density is inversely proportional to the gap distance.

In order to improve the above problems, the upper shielding layer 3 and the lower magnetic layer 6 shown in the first (a) and (b) as shown in the first (c), (d) as a single layer By using the single-layer shared magnetoresistive head having the formed shared layer 9, a method of increasing the track density by reducing the distance between the recording gap and the reproduction gap S 'was used.

However, the widths 7W and 9W of the magnetic layers 7 and 9 above and below the recording gap are also different from each other, as shown in (d). That is, when the width of the lower magnetic layer 9 is 9W, 9W) becomes larger than the width 7W of the upper magnetic layer so that the width TW of any information track recorded on the recording medium by the head becomes larger than the width 7W of the recording gap (TW> 7W). Referring to the fourth (a) and (b) diagrams showing the magnetic field distribution around the head along the length of the magnetic layer width above and below the recording gap, the width of the lower magnetic layer 9W is the width of the upper magnetic layer 7W. If the magnetic field distribution (B) is larger than), the magnetic field distribution (B) is wider than the magnetic field distribution (A) when the width of the magnetic layer is the same, and the area recorded on the medium by the head becomes relatively large, resulting in a decrease in recording density. .

The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to minimize the distance between a recording gap and a reproduction gap, thereby enabling accurate reproduction of recorded information, and providing a step formed in a gap portion of a shared layer. The present invention provides a magnetoresistive head having increased track density to enable high density recording of information by reducing the recording area at the time of recording and minimizing the recording magnetic field distribution.

A feature of the present invention for achieving the above object is a magnetoresistive head in which one layer of the recording magnetic layer constituting the magnetic induction and magnetoresistive composite thin film head has a shared layer shared with one layer of the reproducing shielding layer. The stepped portion is formed at one side of the shared layer to prevent signal interference in adjacent tracks at the gap portion.

Hereinafter, a magnetoresistive head having an increased track density according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic diagram of a magnetoresistive head according to the present invention, in which FIG. 2 (a) is a cross-sectional view, FIG. 2 (b) is a side view of FIG. 2 (a), and FIG. 3 is in accordance with the distance between the recording gap and the reproduction gap. Fig. 4 shows the magnetic field distribution depending on the width of the magnetic layer above and below the recording gap.

In the magnetoresistive head in which one layer of the recording magnetic layer is shared with one layer of the shielding shield for reproducing in order to minimize the distance between the recording gap and the reproduction gap of the magneto-induced / magnet-resistive composite thin film head, The stepped portion 10 is formed in the gap portion, but the thickness of the shared layer 9 'excluding the gap portion is the thickness of the shared layer 9 sharing the recording magnetic layer or the reproduction shielding layer in order to prevent a decrease in recording density. It is formed thinner. More specifically, the distance S ′ between the recording gap and the reproduction gap is shortened to minimize the positional shift during recording and reproduction, thereby increasing the recording density in a given area, and the width recorded on the medium by the information proxy head. The TW and the recording layer have the same width 10W (TW = 7W) to prevent unnecessary information interference in adjacent tracks, thereby enabling high density recording.

As described above, the magnetoresistive head having increased track density according to the present invention is a layer of the magnetic layer for recording that constitutes the magneto-inductive / magnet-resistive composite thin film head to minimize mutual signal interference in adjacent tracks when recording and reproducing information. A stepped portion is formed in the gap portion of the shared layer shared with one layer of the reproducing shielding layer to reduce the recording area when recording arbitrary information, thereby minimizing the recording magnetic field distribution, and enables high density recording. The distance between them is shortened so that accurate reproduction of information is possible.

Claims (1)

In a magnetoresistive head having a shared layer in which one layer of the recording magnetic layer constituting the magneto-induced / magnet-resistive composite thin film head is shared with one layer of the reproducing shielding layer, a stepped portion is formed at a gap portion of the shared layer 9 '. A magnetoresistive head having increased track density, characterized in that 10) is formed.