JPS62262211A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain good sliding characteristic by arranging so that a non- magnetic body having high hardness are packed by exhibiting the exposure of a soft adhesive layer on a face sliding with a magnetic recording medium. CONSTITUTION:A magnetic substance 1 is laminated on a non-magnetic substrate 2, and a gap part 8 is formed by opposed and adhered core half bodies on which a non-magnetic protective plate 5 is fixed through an adhesive layer 6, and the adhesive layer 6 at least in the vicinity of the gap part 8 is packed with a non-magnetic substance of higher hardness so as to replace it. The adhesive layer 6, non-magnetic substrate 2, non-magnetic layer 3 and non-magnetic protective plate 5 are formed of the same material. As relatively soft adhesive layer 6 is not exposed on the sliding face of a magnetic head that slides with a magnetic recording medium, and packed with the non-magnetic substance having higher hardness, good sliding characteristic can be obtained.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is a magnetic recording device that uses a high-performance magnetic recording device for recording and reproducing signals on a metal-based high coercive force magnetic medium that recently requires high-density recording. This relates to magnetic heads.

(Prior art) As metal-based high coercive force magnetic media, metal coated media or Co-Ni based evaporated media are said to have high density characteristics, but due to their high coercive force, conventional ferrite heads cannot be used with conventional ferrite heads. There is a gap in magnetic saturation, and a magnetic head using a metal-based magnetic material corresponding to this gap is required.

Various configurations have been proposed for magnetic heads using such metal-based magnetic materials, and a magnetic head as shown in FIG. 4 is one that achieves high-density characteristics. In the figure, 1 is a metallic magnetic material such as amorphous or sendust, and a substrate 2 of a non-magnetic material such as glass or ceramic is coated with Sin, , AQ.
, 03. Several layers are laminated through non-magnetic FIJ3 such as Si, N, etc., and the final layer is made of the same material as the non-magnetic layer 3.
Form layer 4. Next, a protective plate 5 made of the same material as the substrate 2 is bonded to face the substrate 2. 6 is an adhesive layer. Cut such a block and add non-magnetic material 7 to a predetermined gap length.
The core halves are bonded facing each other to form a head chip.

(Problems to be Solved by the Invention) When a recording medium like the above-mentioned conventional example is slid, there is a drawback that the adhesive layer becomes concave. In other words, horizontal polishing or various types of glass are selected as the adhesive layer, but they are generally softer than the substrate, protective plate, metal-based magnetic non-magnetic layer, protective layer, etc., and therefore cause uneven wear when the medium is slid. occurs locally on the adhesive layer, forming a recess. When such recesses occur on the sliding surface, magnetic media powder, lubricant powder, head scraping powder, or other dust accumulates in the area, causing so-called clogging phenomenon, and etch in the recessed area. The problem was that the damage to the media became more severe, and phenomena such as clogging and scratches on the media worsened at an accelerating rate.

An object of the present invention is to provide a magnetic head that eliminates the drawbacks of the conventional technology and provides good sliding characteristics, with no exposed soft adhesive layer on the surface that slides against the magnetic recording medium, and extremely little occurrence of uneven wear. It is to be.

(Means for Solving the Problems) The magnetic head of the present invention has a magnetic material laminated on a non-magnetic substrate, and core halves to which a non-magnetic protection plate is fixed via an adhesive layer are bonded facing each other. A gap portion is formed, and at least the adhesive layer near the gap portion is filled with a non-magnetic material having higher hardness.

Further, the adhesive layer, the nonmagnetic substrate, the nonmagnetic layer, and the nonmagnetic protection plate are made of the same material.

(Function) According to the present invention, the sliding surface of the magnetic head that slides on the magnetic recording medium is arranged so that the relatively soft adhesive layer is not exposed and is filled with a harder nonmagnetic material. Good sliding characteristics can be obtained.

(Example) An embodiment of the present invention is shown in FIGS. 1-3.

In this figure, the same parts as those in the conventional example shown in FIG. 4 are designated by the same reference numerals, and the explanation thereof will be omitted.

FIG. 1 is a perspective view showing the structure of the magnetic head of the present invention, and FIG. 2 is a plan view showing the sliding surface thereof.

In the figure, a Co-Nb-Zr based amorphous thin film is used as a magnetic material 1, and a SiO□ thin film is used as a non-magnetic material WI3, which are sequentially laminated by sputtering on a substrate 2 such as ceramic or glass, and finally, if necessary, Ba5
A protective layer 4 such as an in2 film is formed by sputtering. A protective plate 5 made of the same material as the substrate 2 is bonded to glass. When using an amorphous thin film, it is necessary to select a glass that can be operated at temperatures lower than the crystallization temperature. For example, if the crystallization temperature is 560°C, lead-based glass that can be bonded at 500°C is used. Therefore, the adhesive layer 6
exists.

The core block formed in this way is cut into two,
The gap surface 7 is formed by lapping.

Next, Sin is formed on each gap surface by sputtering so as to match the gap width. The core halves thus produced are bonded facing each other to form a gap portion of the magnetic head. When the protective layer 4 is bonded to glass,
It serves to prevent the amorphous thin film magnetic material 1 from coming into direct contact with glass and being corroded.

FIG. 3 is a side view of the core half of the head chip shown in FIG. 1. As shown in the figure, the layers are successively laminated, and then, as shown in FIG. 1, they are cut into a single chip. Next, as shown in FIG.
The adhesive layer 6 in the vicinity of is selectively removed. Its depth is the third
As shown in the figure, a high hardness non-magnetic material 9 is filled in the 0th order portion, which is approximately the depth of the gap. Although SiO□ was used as the non-magnetic material 9, any non-magnetic material that has higher hardness than the adhesive layer 6 and is less prone to uneven abrasion may be used.As a forming method, a sputtering method or a method containing SiO□ may be used. There is a method of forming SiO□ by applying a solution and drying at high temperature. After forming in this manner, the sliding surface as shown in FIG. 1 is obtained by polishing by lapping or other means. However, as shown in FIG. 3, the continuous body is polished to a certain predetermined depth and then cut into chips.

Other methods include further polishing to the final state.

As a means for selectively removing the adhesive layer 6, after applying an auxiliary means such as applying a resist to the portions that should not be removed, the adhesive layer 6 is removed in a predetermined position using an etchant that selectively dissolves a large amount of glass. Etch to a depth of .

Another method is to remove the glass by melting and vaporizing it with laser irradiation.

Adhesive layer 6 is selectively removed. In this case, as shown in FIG. 2, the removed end portion may enter the protection plate 5 a little.

As mentioned above, at least the adhesive layer 6 near the gap part 8 is filled with a non-magnetic material of higher hardness, but here, the adhesive layer near the gap part 8 is replaced with , means the portion of the adhesive layer within the entire area that slides with the magnetic recording medium.

In another embodiment, the non-magnetic layer 3. The material of the protective layer 4 and the high hardness non-magnetic material 9 is the material of the substrate 2. Make it the same as protection plate 5. That is, they are formed using the same material by sputtering. In this way, the recording medium and the sliding surface are made of only two types: a magnetic material and a material made of the same material as the substrate, which simplifies the structure and reduces various problems associated with sliding.

(Effects of the Invention) According to the present invention, since the soft adhesive layer is not exposed on the surface that slides on the magnetic recording medium and is filled with a harder non-magnetic material, it is possible to This has the effect of eliminating the problem of concavities in the adhesive layer, and significantly reducing clogging and damage to the medium caused by the tendency for magnetic powder to accumulate. Also, if you use the same material as the substrate and protection plate as a highly hard non-magnetic material.

The sliding surface has an extremely simple structure, and at the same time is made of a substrate.

Since the protective plate is well matched in hardness to the magnetic material, good sliding characteristics with very little occurrence of uneven wear can be obtained, which is highly effective in practical use.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic head according to an embodiment of the present invention;
FIG. 2 is a sectional view of the sliding surface of the same, FIG. 3 is a side view of the core half of the same Herad chip, and FIG. 4 is a sectional view of the sliding surface of the conventional magnetic head. DESCRIPTION OF SYMBOLS 1... Magnetic material, 2... Substrate, 3... Nonmagnetic layer, 4... Protective layer, 5... Protective plate, 6... Adhesive layer, 7... Gap surface, 8 ...gap part,
9...High hardness non-magnetic material. Figure 1 Figure 2

Claims (2)

[Claims] (1) The core halves, in which a magnetic material is laminated on a non-magnetic substrate and a non-magnetic protection plate is fixed via an adhesive layer, are bonded facing each other to form a gap, and at least near the gap, A magnetic head characterized in that the adhesive layer is filled with a non-magnetic material having higher hardness. (2) The magnetic head according to claim (1), wherein the adhesive layer, the nonmagnetic substrate, the nonmagnetic layer, and the nonmagnetic protection plate are made of the same material.