JP2509968B2 - Multi-track magnetoresistive effect magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] A magnetic head having a magnetoresistive effect element, which is formed on a substrate for the purpose of reducing the electrical resistance of a lead wire connected to the magnetoresistive effect element. The line width of a plurality of lead lines connected to the magnetoresistive effect element and drawn out is substantially the same as the width of the magnetoresistive effect element, and the plurality of lead lines are formed with an insulating layer from a position near the magnetoresistive effect element. It is constructed so as to be pulled out to a predetermined position in a state of being laminated by interposition.

[Industrial applications]

The present invention relates to a magnetic head (MR head) including a magnetoresistive effect element.

A magnetic head using a magnetoresistive effect element does not depend on the relative moving speed between the head and the recording medium in reproducing output from the recording medium, unlike an inductive head, so that a reproducing head such as a magnetic tape device having a slow moving speed is reproduced. It is evaluated to be effective when applied to the head.

A magnetic recording device such as a magnetic tape device tends to have a larger capacity and a higher recording track density. For this reason, along with miniaturization of the magnetic head, there is also a demand for a multi-track head having a magnetoresistive effect element provided in a narrow space.

[Conventional technology]

FIG. 3 shows a magnetic head having a conventional magnetoresistive effect element.

In the figure, on a substrate such as ferrite (not shown),
A magnetoresistive effect element (hereinafter simply referred to as an MR element) 1 is formed by a thin film technique, and lead lines 3 and 4 are also formed at both ends of the magnetoresistive effect element 1 and connected to each other. The lead end b of one lead wire 3 is grounded, and a constant current is applied from the lead end a of the other lead wire 4.

The width of the lead lines 3 and 4 should be as wide as possible from the approaching position in the vicinity where the lead-out lines 3 and 4 are drawn from the connection parts at both ends of the MR element 1 to electrically lower the resistance and reduce the resistance of the lead lines 3 and 4. I am trying.

With the above configuration, the MR element 1 undergoes a resistance change in accordance with a change in magnetic strength of the recording medium, and the voltage change component due to this resistance change is used as an output signal.

Since the width of the MR element 1 in the left-right direction in the figure corresponds to the track width 5 of the recording medium, for example, for the 18-track type, 18 MR elements 1 are arranged to form a multi-track head.

[Problems to be Solved by the Invention]

The magnetic head having the conventional MR element shown in FIG. 3 has a plurality of lead lines 3 and 4 formed on the same surface of the substrate. There is a problem that the line width of 4 is limited and narrowed, and an increase in electrical resistance is unavoidable.

In view of the above problems, it is an object of the present invention to provide a magnetic head capable of making the electric resistance of a lead wire as low as possible.

[Means for solving the problem]

In the above, the gist of the present invention to achieve the object is to make the line widths of a plurality of lead lines connected to the MR element formed on the substrate and drawn out substantially the same as the width of the MR element. Along with the MR
The magnetic head is designed to be pulled out from a position near the element to a predetermined position with an insulating layer interposed.

[Work]

According to the above-mentioned configuration of the magnetic head of the present invention, the widths of the plurality of lead lines connected to the MR element are made substantially the same including the width of the MR element, and the plurality of lead lines are connected to the MR element. Since the insulating layer is laminated from the vicinity of the above to the predetermined position, the electric resistance can be made as low as possible within the range of the lead wire region.

It can handle higher track density of recording media and narrower track width. Even if MR element is downsized, the lead wire width is maximized and is almost the same as MR element width. Therefore, it is possible to reduce the deterioration of the detection signal by making the electrical resistance of the lead wire low.

〔Example〕

Hereinafter, the magnetic head of the present invention will be specifically described in detail with reference to the drawings based on an embodiment based on the gist of the invention. In all the drawings, the same parts are denoted by the same reference numerals.

FIG. 1 shows a first embodiment of the magnetic head of the present invention. FIG. 1A is a perspective view of a main part, and FIG. 1B is a portion A of FIG.
It is the figure seen from the arrow direction. MR made of a magnetic material such as Permalloy on the substrate 6 on which an insulating layer (not shown) is formed.
While forming the element 1, a first lead wire 7 connected to one end side of the MR element 1 is formed using copper or the like. This first
The leading line 7 of the MR element 1 extends from the connection portion 8 on one end side with the MR element 1 in the direction of the leading edge to substantially the same width as the width in the left-right direction in the drawing extending almost toward the other end side of the MR element 1. Widened.

An insulating layer (not shown) is formed on the first lead wire 7 except for the other end side of the MR element 1, and a second lead wire 9 connected to the other end side of the MR element 1 with copper or the like is formed. Form. The second lead line 9 is formed so as to be widened from the connecting portion 10 on the other end side of the MR element 1 to the pull-out direction substantially in the same range as the width extending to the one end side direction of the MR element 1. Therefore, as shown in FIG.
Will be stacked with the same width as the first lead line 9 with an insulating layer interposed therebetween.

The MR element 1, the first lead wire 7, the second lead wire 9 and the like are formed by thin film technology.

As described above, the plurality of lead lines, the first and second lead lines 7 and 9, are led out to a predetermined position in the state in which the neighboring elements of the MR element 1 or insulating layers are laminated.

The ends a and b drawn out to a predetermined position are parts to which a constant current is supplied, and are also signal output ends.

FIG. 2 shows a second embodiment of the magnetic head of the present invention. FIG. 2 shows the magnetic head shown in FIG. 1 in which a lead line 11 common to other tracks is connected to the central portion of the MR element 1. This is a commonly used 3
The present invention is combined with and applied to a magnetic head having a terminal type magnetoresistive effect element.

〔The invention's effect〕

As described above in detail, according to the magnetic head of the present invention, the width of the plurality of lead lines connected to the MR element is
The width of the lead wire is almost the same, and multiple lead wires are pulled out to a specified position from the vicinity of the MR element with an insulating layer interposed. Therefore, the deterioration of the signal can be reduced. In addition, it is possible to respond to the miniaturization of the MR element in response to the narrowing of the track width as well as the increase in the track density of the recording medium, and it is possible to increase the capacity of the magnetic storage device. Is very prominent.

[Brief description of drawings]

 FIG. 1 shows a first embodiment of the magnetic head of the present invention, FIG. 2 shows a second embodiment of the magnetic head of the present invention, and FIG. 3 shows a conventional magnetic head. Reference numerals in each figure, 1 is an MR element (magnetoresistive effect element), 3 and 4 are lead lines, 5 is a track width, 6 is a substrate, 7 is a first lead line, 8 is a connecting portion on one end side, and 9 is A second lead line, 10 is a connecting portion on the other end side, and 11 is a common lead line.

Claims (1)

(57) [Claims] 1. The width of a plurality of lead lines connected to a magnetoresistive effect element formed on a substrate and pulled out is substantially the same as the width of the magnetoresistive effect element, and the plurality of lead lines are connected to the magnetoresistive element. A magnetic head characterized in that it is drawn out from a position near the effect element to a predetermined position with an insulating layer interposed.