JPS5971124A - Magneto-resistance effect magnetic head - Google Patents

Abstract

PURPOSE:To attain easily uniaxial anisotropy, even if the track width of a magnetic head is narrowered, by forming a ferromagnetic thin film wider than the track width of the head and forming that the ferromagnetic thin film of a part other than the part forming the track width has a larger distance from the recording medium than the track width to improve the recording density. CONSTITUTION:The ferromagnetic film 11 is formed by being stretched left and right so as to have a size W2 wider than the width W1 of a track part 14 of a magnetic head opposing to the recording medium. The ferromagnetic film 11 is formed in opposite direction to the side where the magnetic recording medium is arranged, and its end 12 is connected to a terminal 13 made of A or Cu formed on the ferromagnetic film 11. In forming the film 11 in this way, since no magnetic charge stored at the side end C of the conventional rectangular magnetic head 3 is not generated, the diamagnetism in the direction of track width W1 is small and excellent shaped magnetic anisotropy is obtained, the magnetic induced anisotropy given at film forming is operated effectively, and any distortion is hardly generated in the reproducing waveform of the head.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to improvements in magnetoresistive magnetic heads, and in particular to improvements in magnetoresistive magnetic heads, and particularly to improvements in magnetoresistive magnetic heads that can achieve good uniaxial anisotropy even when the track width of the magnetic head is narrow. This invention relates to a type magnetic head.

Magnetoresistive magnetic heads, which read information using changes in the resistance of a ferromagnetic film such as permalloy, have a higher
Since thin film formation techniques such as evaporation and sputtering and photolithography techniques can easily produce microscopic shapes, research and development has recently been active with the aim of applying them to magnetic disk drives and the like.

(c) Prior Art and Problems FIGS. 1 and 2 show a cross-sectional view of a conventional magnetoresistive magnetic head and a plan view taken along line AA' of the cross-sectional view.

As shown in FIGS. 1 and 2, a ferromagnetic film 3 made of permalloy and aluminum (At) are deposited on a glass substrate 1 via an insulating film 2 such as silicon dioxide (SiO2).
A connecting terminal 4 made of gold (Au) or the like is formed into a predetermined pattern using techniques such as vapor deposition and photolithography, and is further layered with an SIO□ film 5 to magnetize the magnetic film 3. It is formed by photolithography, and a 5t02 film 7 is formed thereon to form a magnetic head.

Here, 8 is a recording medium such as a magnetic disk or a magnetic tape.

As is well known, such a magnetoresistive magnetic film 3 needs to be given uniaxial anisotropy so that the axis of easy magnetization is directed in the track width direction, as shown by arrow B in FIG. It is. For this reason, as shown in FIG. 2, there is usually a method of making the track width W sufficiently larger than that of the element @1 to take advantage of shape anisotropy, or applying a magnetic field in the track width direction during film formation of the element. It is attempted to provide more magnetic induction anisotropy.

However, in the shape of the magnetic film 3 shown in FIG. 2, if the track width W is made smaller, the shape demagnetizing field in the track width direction becomes larger, so that the effect of shape anisotropy cannot be expected.
It becomes difficult to impart magnetic induction anisotropy, and it becomes difficult to realize good uniaxial anisotropy.

When the -axis anisotropy is disturbed in this way, distortion is likely to occur in the reproduced waveform of the head, and discontinuous changes in electrical resistance called Barkhausen noise occur, resulting in defects that deteriorate the characteristics of the magnetic head. .

(Object of the Invention) In order to eliminate the above-mentioned drawbacks and improve the recording density, the present invention aims to eliminate the above-mentioned drawbacks and improve the recording density. It is an object of the present invention to provide a magnetoresistive magnetic head which can easily impart anisotropy and can easily realize -axis anisotropy.

(e) Structure of the Invention In order to achieve the above object, the magnetoresistive magnetic head of the present invention comprises forming a ferromagnetic thin film and a connecting conductor layer on a substrate via an insulating film, and In a magnetic effect magnetic head in which a layer is formed in a predetermined pattern and then an insulating film is formed thereon, the ferromagnetic thin film is formed to be wider than the track width of the ferromagnetic thin film and the ferromagnetic thin film is formed to be wider than the track width of the track width. The magnetic thin film is characterized in that it is formed such that the distance from the recording medium is greater than the width of the groove.

(f) Embodiment of the Invention Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a plan view showing a first embodiment of the magnetoresistive magnetic head of the present invention, and FIG. 5 is a plan view showing another embodiment. FIG. 4 is a plan view of the magnetic head at an intermediate step in forming the magnetic head of the first embodiment.

As shown in FIG. 3, the magnetic head of the present invention has a dimension W wider than the track width of the magnetic head facing the recording medium.
The ferromagnetic film 11 is formed so as to protrude from side to side so as to have a diameter of 2.

This ferromagnetic film 11 is formed in the opposite direction to the side where the magnetic recording medium is installed, and the ferromagnetic film 11 is formed at the end thereof.
It is connected to a terminal 13 formed above, such as At or Cu.

When the ferromagnetic film 11 having such a shape is formed, the magnetic charge accumulated in the secondary C is not generated, so the shape demagnetizing field in the track width direction is small, and good shape magnetic anisotropy is realized. The magnetic induction anisotropy imparted during film formation also works effectively, making it difficult for distortion to occur in the reproduction waveform of the head.

Incidentally, in this embodiment, the ferromagnetic film 11 other than the core width W1 also functions as a magnetoresistive film, but since this part is further away from the recording medium by d than the core width part, this part The medium magnetic field felt by the head is sufficiently small that it does not contribute to changes in the resistance value of the entire head.

In addition, in order to further improve the magnetic anisotropy of the magnetic head formed in this way, as shown in FIG.
Above all, it is conceivable to form it on the opposite side. In this way, the portion 16 having the width W3 will have sufficiently good uniaxial anisotropy due to shape anisotropy and induced anisotropy, and it is expected that this will also improve the anisotropy of the desired track portion 17. can.

Here, the reference numeral 18 is also a multi-track head such as a head for a magnetic tape device, as shown in FIG. 5, as another embodiment.

Also in the magnetic head, it is possible to combine a large number of ferromagnetic films 11 formed in the shape of the magnetic head of the present invention shown in FIG. As mentioned above, 15 indicates the final finished surface of the head.

(B) Effects of the Invention As described above, according to the method of the present invention, even when a magnetoresistive magnetic head is formed by narrowing the track width, the geometric demagnetizing field in the track width direction is small and the magnetic induction A magnetoresistive magnetic head can be obtained which can easily impart anisotropy and can easily realize -axis anisotropy.

In addition, although the above embodiment has been described using an example in which one magnetoresistive element is formed on a substrate, it is also possible to form two magnetoresistive elements in parallel with each other with an insulating film interposed therebetween. However, it can also be used in a magnetic head in which a bias magnetic field is applied to each element using a current flowing through each element, or in a shunt bias type magnetism. Furthermore, a seal is provided in which the magnetic material for the sheet is placed on both sides of the magnetoresistive element.
It is clear that the present invention can also be applied to lead-type magnetoresistive heads.

[Brief explanation of drawings]

1 and 2 are cross-sectional views and a plan view thereof of a conventional magnetoresistive magnetic head, and FIGS. 3 and 5 are plan views showing an embodiment of the magnetoresistive magnetic head of the present invention. , FIG. 4 shows the formation 3 of the magnetic head of the present invention, 11, 16, and 17 are ferromagnetic films, 12 is an end portion, and 13 is a terminal.

Claims (1)

[Claims] A magnetoresistive magnet, which is formed by forming a ferromagnetic thin film and a connecting conductor layer on a substrate via an insulating film, forming the ferromagnetic thin film and conductor layer in a predetermined pattern, and then forming an insulating film thereon. In the head Kh, the ferromagnetic thin film is formed to be wider than the track width of the head, and the ferromagnetic thin film other than the part forming the track width is formed so that the distance from the recording medium is larger than the track width part. A magnetoresistive magnetic head.