JP3089673B2 - Magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art In recent years, a magnetic head has been required to have a higher magnetic flux density and a higher magnetic permeability as the recording density is improved. However, the magnetic head made of ferrite, which is most commonly used at present, has a relatively small saturation magnetic flux density in a high coercive force tape used to improve the recording density, and cannot obtain the characteristics required by the market. There was envy. In order to obtain the required characteristics in such a situation, a metal-in-gap method (hereinafter referred to as M-type) in which a metal magnetic material such as an amorphous magnetic material is deposited in the vicinity of a magnetic gap where recording and reproduction are performed.
An IG method), a lamination method in which a metal magnetic material and an insulating layer are alternately laminated, and the like have been developed.

[0003] The lamination method requires bonding with a metal magnetic material, an insulating layer, a supporting substrate and glass, and the MIG method requires bonding with ferrite, a metal magnetic material and glass.

Hereinafter, a conventional magnetic head will be described. FIG. 4 is an enlarged sectional view of a main part of a conventional laminated magnetic head, FIG. 5 is an enlarged sectional view of a main part of a MIG magnetic head, and FIG. 6 is an enlarged view of a main part of a conventional general ferrite magnetic head. It is sectional drawing. 1 is a supporting substrate, 2 is a metal magnetic material, 3 is insulating glass, 4 is bonding glass, 5 is gap glass, and 6, 6 'is ferrite.

[0005] In the case of joining different kinds of materials, a difference in the coefficient of thermal expansion α (hereinafter abbreviated as α) peculiar to the materials becomes a problem. If there is a large difference in α between the materials to be joined, the magnetic properties will be degraded due to the tensile stress or compressive stress generated at the joint, and in extreme cases, cracks and peeling of the metal magnetic material will occur at the joint become. On the other hand, the ferrite, metal magnetic material, insulating layer, support substrate, glass, etc. used must have good workability to perform ultra-precision processing, and must have mechanical strength that can withstand the impact received when used. Also, good compatibility with the magnetic medium (such as interface wear resistance) is required.

For example, in a conventional magnetic head as shown in FIG. 6, α is 12 × 10 ⁻⁷ / ° C. between ferrite 6 and ferrite 6 ′ to form a gap.
The gap glass 5 of 0 × 10 ⁻⁷ / ° C. is used. In order to obtain the mechanical strength of the gap, α is 120 × 10
The bonding glass 4 of ^-7 / ° C is used.

[0007]

However, it is very difficult to obtain a material that satisfies α, has good workability, has high mechanical strength, and has good compatibility with the medium. However, it is very difficult to supply a magnetic head having the best magnetic characteristics. Further, it is difficult to obtain a ferrite, a gap glass, and a bonding glass having the same α even with a conventional general magnetic head. Therefore, there is a problem that the magnetic properties are degraded by tensile stress and compressive stress generated by a slight difference in α between ferrite, gap glass, and bonding glass.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a magnetic head which absorbs a tensile stress or a compressive stress caused by a difference in α and prevents deterioration of magnetic characteristics.

[0009]

In order to achieve the above object, a magnetic head according to the present invention comprises a partially stabilized zirconia (hereinafter referred to as PSZ) between respective layers of a non-magnetic material serving as a magnetic gap interposed between a pair of magnetic cores. ) Is formed.

[0010]

With this configuration, even if the material for the magnetic head has good workability, excellent mechanical strength, and good compatibility with the medium, the material that could not be used due to a large difference in α, By interposing a partially stabilized zirconia layer between the materials, the tensile stress or the compressive stress can be reduced, and various materials can be used.

[0011]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an enlarged sectional view of a main part of a general ferrite magnetic head on which a PSZ thin film of the present invention is formed. 4 is a bonding glass, 5 is a gap glass, 6, 6 '
Is a ferrite and 7 is a PSZ thin film. A PSZ thin film having a thickness of 0.1 μm is formed on the opposing surface of the ferrite 6 and the ferrite 6 ′ by a sputtering method. A head was formed. Next, the effect of the PSZ thin film on the output was confirmed.
The output of the magnetic head was improved by 2.0 dB as compared with the magnetic head without forming the Z thin film.

(Embodiment 2) A case where a thin film of PSZ having a thickness of 0.1 μm is formed and not formed by using a gap glass and a bonding glass 4 having the same α as ferrites 6 and 6 ′ made of the same material. Were prepared, and the relationship between α and the magnetic head output was confirmed.

The results are shown in (Table 1). The output of the magnetic head shown in the table is the output of the magnetic head when the difference of α is 0 and the PSZ thin film is not formed (measurement frequency is 1M).
(Hz).

[0015]

[Table 1]

As is apparent from Table 1 above, PSZ
When the thin films are laminated, the difference in α between the materials is 25 × 10
Above ^-7 / ° C, the output of the magnetic head is smaller than when the difference in α is 0 when no PSZ thin film is formed, but no cracks are observed, so it can be combined with other materials. Is shown.

When a PSZ thin film is not formed, α
When the difference was 15 × 10 ⁻⁷ / ° C. or more, cracks occurred between the ferrite 6 and the ferrite 6 ′ and the gap glass 5 and the bonding glass 4.

When a PSZ thin film was formed by lamination, cracks occurred when the difference α was 30 × 10 ⁻⁷ / ° C. or more.

(Embodiment 3) FIG. 2 is an enlarged sectional view of a main part of a MIG magnetic head according to the present invention, in which a PSZ thin film is laminated. Reference numeral 2 denotes a metal magnetic material made of a sendust alloy, 4 denotes a joining glass, 5 denotes a gap glass, and 6,6 ′ denotes ferrite, each of which is made of a material having a coefficient of thermal expansion α of 120 × 10 ⁻⁷ / ° C. And a 0.1 μm thick PS between the metal magnetic body 2 and the gap glass 5 and the bonding glass 4.
A magnetic head in which Z thin films were laminated was prepared. This and PSZ
An unprocessed MIG magnetic head was formed, and the magnetic head output was measured and compared.
The head output of the magnetic head was improved by 1.8 dB.

Next, the effect of the PSZ thin film on the output of the opposing surface of the ferrite 6 'and the metal magnetic material 2 was confirmed.

The ferrite 6 'has a 0.001 .mu.m thick P
When an SZ thin film is formed by sputtering and a sendust alloy layer 2 is formed thereon by sputtering, PS
The output of the magnetic head is 1.
Improved by 5 dB.

Conventionally, in the case of a MIG magnetic head, when the sendust alloy layer is sputtered on the ferrite-facing surface, the output of the MIG magnetic head is reduced due to the distortion of the initial sputtered layer of the sendust alloy. It was found to be improved.

(Embodiment 4) FIG. 3 is an enlarged sectional view of a main part of a two-layer laminated portion of a laminated amorphous magnetic head on which a PSZ thin film of the present invention is formed.

2 is a metal magnetic material having a thickness of 5 μm and made of an amorphous material having α of 110 × 10 ⁻⁷ / ° C., and 3 is a 0.3 μm-thick metal material.
PSZ was laminated to a thickness of 0.3 μm between the support substrate 1 and the metal magnetic material 2 using insulating glass having an α of 5 × 10 ⁻⁷ / ° C. Next, P is placed between the metal magnetic body 2 and the insulating glass 3.
SZ was laminated to a thickness of 0.1 μm, and insulating glass 3 was laminated thereon to a thickness of 0.2 μm. This was repeated to form a total of eight layers, thereby obtaining a laminated magnetic head similar to FIG. On the other hand PSZ
A magnetic head output was compared, and the magnetic head output was improved by 1.4 dB for the magnetic head output of the laminated PSZ.

[0025]

As described above, according to the present invention, a PSZ is laminated between a ferrite, a supporting substrate, a metal magnetic material, an insulating glass, a gap glass, a bonding glass and the like.
The PSZ thin film absorbs tensile stress and compressive stress generated between materials, remarkably improves the durability of the magnetic head, and enables the use of different types of materials as constituent materials of the magnetic head. Thus, an excellent magnetic head with improved characteristics can be realized.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a ferrite magnetic head according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the MIG magnetic head of the present invention.

FIG. 3 is an enlarged sectional view of a main part of the laminated magnetic head of the present invention.

FIG. 4 is an enlarged sectional view of a main part of a conventional laminated magnetic head.

FIG. 5 is an enlarged sectional view of a main part of a conventional MIG magnetic head.

FIG. 6 is an enlarged sectional view of a main part of a conventional ferrite magnetic head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support substrate 2 Metal magnetic body 3 Insulating glass 4 Bonding glass 5 Gap glass 6 Ferrite 6 'Ferrite 7 PSZ

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-17210 (JP, A) JP-A-2-96908 (JP, A) JP-A-1-290109 (JP, A) JP-A-3-3 272004 (JP, A) JP-A-62-236107 (JP, A) JP-A-61-144710 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 5 / 127-5 / 255

Claims (2)

(57) [Claims] 1. A magnetic head in which a pair of magnetic cores are joined to each other via a non-magnetic material serving as a magnetic gap, wherein a partially stabilized zirconia layer is provided between the non-magnetic material and the magnetic core. Characteristic magnetic head. 2. The magnetic head according to claim 1, wherein the difference in the coefficient of thermal expansion α between 30 ° C. and 400 ° C. of each constituent member is within ± 30 × 10 ^-7 .