JPS62298908A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the productivity and to uniformize the magnetic flux in the breadthwise direction of tracks by sticking metallic magnetic thin films on a pair of magnetic material substrates and allowing metallic magnetic thin films to face each other to form a magnetic gap in the direction approximately orthogonally to magnetic material substrates. CONSTITUTION:Metallic magnetic films 3 are stuck onto a pair of magnetic material substrates 11 and are allowed to abut each other to form a magnetic gap 5, and the direction of the magnetic gap 5 is approximately orthogonal to magnetic material substrates 11. Two divided blocks placed on diagonal lines out of four blocks divided by metallic magnetic films 3 and the magnetic gap 6 on the medium slide face of a head consist of magnetic material substrate 11, and two other blocks consist of nonmagnetic materials 7. Thus, the joint surface between metallic magnetic thin films and oxide magnetic materials is made widen to uniformize the intensity of magnetic field on the gap.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic head, particularly a single-layer or multi-layer magnetic film structure that is highly productive and has a uniform magnetic flux in the track width direction. The present invention relates to a magnetic head.

[Prior Art] With the recent increase in the density of magnetic recording technology, magnetic heads have changed from conventional oxide magnetic materials to metal magnetic materials with a high saturation magnetic flux density (for example, Sendust, etc.). A composite magnetic head partially using amorphous permalloy (such as amorphous permalloy) has been proposed.

15 to 20 show a conventional composite magnetic head. FIG. 15 shows a head in which a metal magnetic film M is formed on an oxide magnetic material F tilted at approximately 45 degrees with respect to the magnetic gap G, and both sides of the magnetic gap G are filled with a non-magnetic material N.

FIG. 16 shows a head in which a metal magnetic film M is formed on a substantially chevron-shaped oxide magnetic material F with respect to a magnetic gap G, and an emergency material N is filled between this M.

FIG. 17 shows a substrate B made of an oxide magnetic material F1 and a non-magnetic material N1 shown in FIG. A head half-rest is obtained and combined with another head half-rest having a similar structure to form a head.

Other metal magnetic films M as shown in FIG. 19 or 20
There is also a head shaped like this.

[Problems to be Solved by the Invention] In conventional magnetic heads using oxide magnetic materials, gold, and magnetic films, the problem of eddy current loss in the metal magnetic film occurs due to the wide band of magnetic flux flowing into the head due to higher recording density. is large, and as a countermeasure to this problem, there is a trend toward multilayer structure of the metal magnetic film portion. Although it is conceivable to make the metal film portion of the above-mentioned composite head multilayered, these heads still have the following drawbacks.

For example, in the head shown in FIGS. 15 and 16, since the bonding surface between the metal magnetic film and the oxide magnetic material cannot be made wide, the magnetic flux distribution within the metal magnetic film is non-uniform.

On the other hand, in the head structure shown in FIG. 17, although the above-mentioned bonding surface can be made sufficiently wide, it is necessary to separate the oxide magnetic material one by one and assemble it by covering it with a metal magnetic film.
It is not suitable for mass production because the number of production steps is large.

In addition, in the head structure shown in Figures 19 and 20, the surface on which the metal magnetic film M is formed has a multi-layered shape, and in the process of forming the second film, predetermined magnetic properties are obtained due to its internal stress. do not have.

Therefore, an object of the present invention is to provide a magnetic head having a structure that solves the drawbacks of the conventional head structure, has good productivity, and can uniformize the magnetic flux in the trunk width direction. [Means for achieving] The magnetic head of the present invention achieves the above object.

A metal magnetic thin film is deposited on a pair of magnetic substrates, and a magnetic gap formed by abutting the metal magnetic thin films is formed in a direction substantially perpendicular to the magnetic substrates, and a medium sliding contact is formed. The present invention is characterized in that among the divided blocks divided into four by the line directions of the metal magnetic Vt, W and the magnetic gap in the plane, the divided blocks located on the diagonal line are constructed from the magnetic substrate.

[A bimetallic magnetic thin film is deposited in a direction substantially perpendicular to the working gap, and a magnetic substrate is placed diagonally to the gap, so the bonding surface between the metal magnetic thin film and the oxide magnetic material can be widened. The magnetic field strength over the gap is made uniform.

[Embodiments of the Invention] The present invention will be described below with reference to embodiments shown in the drawings.
FIG. 1 shows an embodiment of a magnetic head according to the present invention. In the figure, reference numeral 11 denotes a pair of magnetic substrates, on which a metal magnetic film 3 is deposited. A magnetic gap 5 is formed by abutting the metal magnetic films 3, and the direction of the magnetic gap 5 is substantially perpendicular to the magnetic substrate 11.

Further, among the divided blocks divided into four blocks by the metal magnetic film 3 and the magnetic gap 5 on the medium sliding contact surface of the head, two divided blocks located diagonally are the magnetic substrate 11, The other two blocks consist of non-magnetic material 7. Note that 4 is a winding groove.

Next, an example of a method for manufacturing the above-described magnetic head will be explained.

(1) First, as shown in FIG. 2, a groove 2 having at least one side surface 2' substantially perpendicular to the substrate surface 1 is formed on a magnetic substrate Il made of, for example, an oxide magnetic material.

(ii) Next, as shown in FIG. 3, a multilayer film 3 is formed by sputtering a metal magnetic film and a nonmagnetic film alternately in the direction of the arrow in the groove 2. However, the last surface is made of a nonmagnetic film.

Note that even if one direction of the sputtering of the multilayer film 3 approaches the direction of the dashed arrow in FIG. It can be formed on the surface with sufficient efficiency.

(ni) Next, the substrate surface 1 is polished with a polishing lamp as shown in FIG. 4 to remove the metal magnetic film on the substrate surface.

(iv) Next, a coil winding i back 4 shown in FIG. 5 is formed on the substrate surface 1 side.

(■) A gap-forming nonmagnetic film 5 (for example, SiO2, etc.) is formed on the lapped substrate surface 1.

(vl) Next, as shown in FIG. 6, another similarly formed head half 6 and the multilayer metal film 3 formed substantially perpendicular to the substrate surface 1 are butted so as to face each other, and the above-mentioned groove 2
A non-magnetic material 7 such as glass is filled and fixed.

(v]i) Next, as shown in FIG. 7, the end surfaces 8 and 9 of the oxide magnetic material on the side opposite to the gap forming surface of the substrate surface 1 are removed without leaving the multilayer film portion 10 at the bottom of the groove 2. Cut it like this. This is to prevent the characteristics of the metal magnetic film 3 from deteriorating if the multilayer film portion 10 has a complicated shape and is distorted due to internal stress, and this portion is left.

(Unbalanced) Next, in FIG. 7, the multilayer film 3 is cut as shown in FIG. 8, leaving a portion 14 substantially perpendicular to the gap 5, to obtain the magnetic head shown in FIG.

FIG. 9 shows another embodiment of the present invention, in which the angle θ between the gap side end face of the oxide magnetic material 11 near the gap 5 and the gap 5 is set to 10" or more so that the oxide magnetic material 11 does not form a pseudo gap. As shown in FIG. 10, this processing may be carried out before the step shown in FIG. 2, and the manufacturing method is as shown in FIG. This groove is formed by cutting separately, and is filled with a non-magnetic material 7' such as glass and polished to the shape shown in the figure.The large dimension of the above groove is 175 to 4 mm of the track width. About twice as much.

Further, after filling the groove 2 with a non-magnetic material 7 such as glass in the step shown in FIG. 3, the first
As shown in FIG. 1, the grooves 12 and 13 may also be processed to secure the track width. In this case, the groove 12 is a cutting groove that regulates the track width by the cutter,
θ is set to 10' or more to avoid the formation of a pseudo gap. In addition, the groove 13 is a cutting groove for other track width regulations,
Since the track width can be regulated with just the groove 12, it is not necessarily necessary. The grooves 12 and 13 are filled with a non-magnetic material 7 such as glass in the process shown in FIG.

Furthermore, although the multilayer film portion 10 is removed in the step shown in FIG. 8, if the gap has an azimuth angle, the chip core 14 is removed during slicing as shown in FIG.
The step of removing the multilayer film portion 10 at the bottom of the groove 2 in FIG. 8 may be omitted by slicing at a position 14' such that the portion 10 does not remain on the side.

Further, after the step shown in FIG. 3, the metal magnetic film 3 may be filled with a non-magnetic material such as glass to reinforce this film, and then the processing shown in FIG. 4 may be carried out. .

In addition, in the above embodiment, the metal film 3 has a multilayer structure, but
Of course, the structure is not limited to this, and a single layer structure may be used depending on the characteristics of the head.

[Effects of the Invention] As is clear from the above explanation, according to the present invention, the following excellent effects can be obtained.

(b) As mentioned above, a multilayer film formed on a surface other than the flat surface on which the gold-a magnetic film is formed has a lot of distortion due to internal stress, which has a negative effect on the head, but in the present invention, after slicing, Since the portion of the core chip portion 14 that is distorted due to internal stress (the portion having a shape other than a substantially planar shape) is removed, the above-mentioned adverse effects can be completely prevented.

(b) Since the metal magnetic film is formed in a direction substantially perpendicular to the gap and the magnetic substrate is arranged symmetrically with respect to the gap, the magnetic field strength above the gap is made uniform.

Furthermore, by forming the metal magnetic film on the magnetic substrate in a direction substantially perpendicular to the gap, it is possible to form the metal magnetic film to a position far enough away from the gap, thereby reducing the magnetic field distribution within the film. It can be made uniform.

To further explain this point with reference to the drawings, since the magnetic gap G is formed perpendicularly to the magnetic substrates a and b as shown in FIG. 13, the contact surface between the metal magnetic film and the magnetic substrate Since S can be made sufficiently wide, the magnetic flux can pass through easily, and the magnetic flux within the metal magnetic film in the track width direction of the magnetic gap G can be made uniform.

This means that even in a head where the magnetic gap is inclined with respect to the head end face and has an azimuth angle as shown in FIG. 14, the portion corresponding to the contact surface S is smaller than the conventional example shown in FIG. 15. There is no difference in that it can be made sufficiently wide, so the same effect can be obtained.

Note that when the metal magnetic film is formed of a multilayer film, the magnetic flux of the magnetic film layer distant from the substrates a and b tends to be small, and non-uniformity of magnetic flux tends to occur between the multilayer films. b
By arranging them diagonally, the non-uniformity of the magnetic flux can be eliminated, and the magnetic flux in the track width direction of the magnetic gap G becomes uniform. Further, even when the metal magnetic film is a single-layer film, the flow of magnetic flux tends to decrease as the distance from the substrate a increases, so a similar effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a magnetic head according to the present invention;
2 to 8 are diagrams showing an example of each process of the method for manufacturing the magnetic head, FIGS. 9 to 12 are diagrams showing modifications of the present invention, and FIGS. 13 and 14 are diagrams showing the present invention. 15 to 20 are diagrams illustrating conventional magnetic heads, respectively. 3...Metal magnetic film. 5... Gap, 7... Nonmagnetic material, 11... Magnetic substrate. Patent Applicant Sankyo Seiki Seisakusho Co., Ltd. Agent Patent Attorney Eiji 1) Take 3 Department 25'2 Figure 11

Claims (1)

[Claims] A metal magnetic thin film is deposited on a pair of magnetic substrates, and a magnetic gap formed by abutting the metal magnetic thin films is formed in a direction substantially perpendicular to the magnetic substrate, and a medium sliding contact is formed. A magnetic head characterized in that among divided blocks that are divided into four in a plane by the metal magnetic thin film and the magnetic gap, the divided blocks located diagonally are formed of the magnetic substrate.