JPH04192103A - Lamination type magnetic head - Google Patents

Abstract

PURPOSE:To improve the contact state between a magnetic head and a recording medium even in case of wear of metallic thin films by constituting a head substrate of >=2 kinds of materials varying in wear characteristics. CONSTITUTION:A laminate 1 is formed by laminating magnetic metallic thin films 6a, 6b consisting of, for example, 'SENDUST(R)', amorphous Co, etc., via an insulating thin film 7. Further, the laminate 1 is pinched by the substrates consisting of two kinds of the substrates varying in the wear characteristics; for example, the head substrate 3 having hard characteristics, such as, for example, ceramics, and the head substrate 2 having the softer characteristics than this head and is further laminated with the magnetic metallic thin films 6... on the side having the higher tendency to wear. Then, the head substrates on both sides of the laminate wear earlier than the conventional substrates even if the magnetic head wears unevenly and, therefore, the magnetic recording medium 8 at the time of traveling is deformed as shown in Fig. and the spacing between the laminate 1 does not increase in the past. The nearly tight contact state is thus maintained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic head used in a magnetic recording/reproducing device.

[Conventional technology]

Laminated magnetic heads use metal magnetic thin films (such as Sendust and Co-based amorphous) with high saturation magnetic flux density in the laminated body, and can record well even with high coercive force media, so even at high frequencies, there is no effect of eddy current loss. It is small and can regenerate signals with high efficiency.

The advantage of the shape is that the track width is determined by the number of laminated layers or the thickness of the laminated layers, so the track width can be formed more easily and accurately than with the bulk type, which has limitations in processing narrow tracks.

Magnetic recording is becoming more dense, with shorter recording wavelengths (high frequency recording).
, a narrower track pitch is always the goal. As a magnetic head that can meet this demand, a stacked magnetic head is indispensable.

[Problem that the invention seeks to solve]

In conventional laminated magnetic heads, the wear characteristics of the laminated body are inferior to that of the head substrate, so as time passes, uneven wear occurs due to the difference in the wear characteristics of the head substrate and the laminated body (wear The laminate, which is made of thin magnetic metal films that are easy to wear, wears out more quickly (wears out) than the head substrate.As a result, the sliding surface has a concave shape.

The sliding state between the recording medium and the conventional laminated head is as shown schematically in FIG. 11, and a large space is left between the laminated body, which is the main magnetic circuit, and the magnetic recording medium.

It is well known that the space loss between the magnetic head and the recording medium generally increases in proportion to the space d and inversely to the recording wavelength λ.

Space loss d/λ The larger the space, and the shorter the wavelength (high frequency) recording/reproduction, the greater the loss.

As described above, uneven wear tends to occur, creating a space between the magnetic recording medium and the magnetic head, which reduces reproduction output, especially in high frequencies, which is a major problem depending on the shape of the laminated magnetic head.

[Purpose of the invention]

This invention was made to solve the above problems, and by using two or more types of materials with different wear characteristics for the head substrate, when the laminate is worn out, the magnetic recording medium (magnetic tape ) and the formation of air gaps in the magnetic head, and the purpose is to obtain a stacked magnetic head with less space loss.

[Means to solve the problem]

In the magnetic head device according to the present invention, first, the head substrate is made of two or more types of materials having different wear characteristics. Also,
The structure is such that the metal magnetic thin films of the laminate are laminated on the side of the head substrate that is easily worn.

[Action of the invention]

In the magnetic head of the present invention, the metal magnetic thin film is laminated on the easily worn side of the head substrate, so even if the magnetic head experiences uneven wear, the head substrates on both sides of the laminate also wear out faster than conventional substrates. Therefore, the distance between the magnetic recording medium and the laminated body during running is large.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a schematic diagram of a laminated magnetic head according to an embodiment of the present invention, and FIG. 2 is a diagram showing a sliding surface of this laminated magnetic head with a magnetic recording medium.

As is clear from the figure, the laminate (11) has a structure in which metallic magnetic thin films (6a) (6b) made of sendust, Co-based amorphous, etc. are laminated with an insulating thin film (7) interposed therebetween. Furthermore, this laminate (1) has
The head substrate is sandwiched between two types of substrates with different wear characteristics, for example, a head substrate (hard) with hard characteristics like ceramic (1) and a head substrate (soft) with softer characteristics (2). The laminated body (11 metal magnetic thin films) is laminated on the side that is more prone to wear.

Therefore, even if the magnetic head wears unevenly, the head substrates on both sides of the stack also wear out faster than conventional substrates, so the magnetic recording medium (8) during running is
), and the distance (i.e., space) between the laminate and the laminate does not become as large as in the conventional case, and a close state can be maintained.

In addition, FIG. 3 (al) shows the case where the head substrate is made of a material that is more resistant to wear than the metal magnetic thin film of the laminate, and FIG. This figure shows a case where the material is made of materials that are more easily worn than those of the previous model, and materials that are less likely to be worn.

Next, an example of a manufacturing process will be described.

Process ■ Metal thin films and insulating thin films are alternately laminated by sputtering, vapor deposition, etc. on the wear-prone side of the head substrate, which is composed of two or more types of materials with different wear characteristics. See Figure 4.

The pieces obtained in step ■ ■ are further stacked to form a power block. See Figure 5.

Cut the block that has completed the process ■ ■ to obtain a half-core break. Figures 6-7.

Process■ Create a welding groove (12) to integrate the pair of core halves with reinforced glass. See Figure 8.

Process ■ Fill the welding groove (11) with a non-magnetic material (5) such as glass for adhesion, and remove unnecessary parts.

Step (2) Prepare a pair of half-core cores (10) that have undergone step (2), and form a groove (12) to serve as a coil winding window in one half-core (10).

Step (2) A non-magnetic gap material is deposited to a predetermined thickness on the gap-forming surfaces of the pair of half-core cores (10) that have undergone step (2) using physical vapor deposition such as sputtering.

Process ■ As shown in Fig. 11, a pair of core halves (10) are joined to each other and integrated under pressure and heat, and then cut at predetermined positions to obtain a compact multilayer magnetic head. .

The magnetic head of the present invention can be easily obtained by the above steps (1) to (2). The film forming technique used in step (2) may be physical vapor deposition such as sputtering or vacuum evaporation, or may be replaced by other methods depending on the case.

In addition, in the cutting in step (2), the required azimuth angle can be obtained by cutting obliquely to the bonding surface, as is conventional. In addition, what is not described in this specification regarding the magnetic head of the present invention and its manufacturing method is as follows.
This follows the conventional technology.

〔Effect of the invention〕

As described above, according to the present invention, since the head substrate is composed of two or more types of materials with different wear characteristics, by laminating the metal magnetic thin film on the side of the substrate that is easily worn, the metal thin film can be easily worn out. Even when the magnetic head is running, the contact between the magnetic head and the recording medium can be improved, and space loss can be greatly improved.

Furthermore, since most of the manufacturing processes for conventional laminated magnetic heads are used, the manufacturing method has a high yield and is suitable for mass production.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a laminated magnetic head according to an embodiment of the present invention, FIG. 2 is a sliding surface diagram of a magnetic recording medium according to an embodiment of the present invention, and FIG. 3 is a diagram of the present invention. Figure 4 is a diagram of the state of contact between the laminated magnetic head and the recording medium during running, Figure 4 is a diagram of the metal thin film lamination process, Figure 5 is a diagram of the laminated block manufacturing process, and Figure 6 is a diagram of the laminated block manufacturing process.
The figure is a cutaway diagram of a stacked block, Figure 7 is a conceptual diagram of a half-core core, Figure 8 is a diagram of a half-core core with grooves for welding, Figure 9 is a process diagram for integrating a pair of half-core cores, and Figure 1O is a diagram of the process of integrating a pair of half-core cores. FIG. 11 is a schematic configuration diagram of a conventional laminated magnetic head. l... Laminated body, 2... Head substrate (soft), 3...
Head substrate (hard), 4... Magnetic gap, 5... Reinforced glass, 6a... Metal magnetic thin film, 6b... Metal magnetic thin film, 7... Insulating thin film, 8... Magnetic recording medium ,9
... Space, IO ... Core half-off, 11 ... Welding groove, 12 ... Winding window.

Claims (6)

[Claims] (1) A laminated type magnetic head in which the main magnetic circuit is composed of a laminated body of a metal magnetic thin film and an insulating thin film, in which the head substrate is composed of two or more types of materials with different wear characteristics. magnetic head. (2) The laminated magnetic head according to claim 1, wherein the head substrate made of two or more types of materials is made of a material that is less abrasive than a metal magnetic thin film. (3) The laminated magnetic head according to claim 1, wherein the head substrates made of two or more types of materials are joined in order of wear characteristics. (4) The laminated magnetic head according to claim 3, wherein the laminated body of the metal magnetic thin film and the insulating thin film is laminated on a side of the head substrate that is prone to wear. (5) The laminated magnetic head according to claim 1, wherein the head substrate is made of two types of materials: one that is more abrasive than the metal magnetic thin film, and the other that is less abrasive. (6) A laminated magnetic head according to claim 5, characterized in that a metal magnetic thin film is laminated on the easily worn side of the head substrate made of two types of materials.