JPS6020306A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To obtain a head having excellent mechanical strength and wear resistance and good magnetic characteristics by forming films for preventing reaction of a low m.p. glass for forming a gap with a magnetic material between said glass and the magnetic material on the opposite surfaces for constituting a gap of a magnetic head with which a metallic magnetic material is used as cores. CONSTITUTION:Dense SiO2 films 4, 4 are formed by sputtering SiO2 in gaseous Ar contg. O2 on the front and rear surfaces 3, 3 constituting a gap of a pair of magnetic cores 1, 1 consisting of a magnetic metallic material having a U-shaped section. Low-melting glass of PbO-B2O3 or the like is then sputtered thereon and both cores 1, 1 are mated and the cores are joined by pressing and heating. The glass 5 diffuses into the films 4 and the magnetic gap is obtd. without arrival of the glass at the magnetic metallic material. The head having high resistance to wear and strength is thus obtd. without reaction of the components of the glass 5 with the cores 1. A stable oxide such as Al2O3, TiO2 or the like or BN, SiC, etc. may be used in place of SiO2 for the films 4, 4.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic head used in a magnetic recording device (including a storage device of an electronic computer, etc.), and in particular, a magnetic head with good magnetic properties and high mechanical strength. Regarding large magnetic heads.

[Background of the invention]

The edge of the gap near the contact surface of the magnetic head with the magnetic tape greatly affects the recording and reproducing sensitivity. Therefore, the mechanical accuracy of the edge of the gap is always kept constant, and the gap spacer is mechanically It is necessary to be firmly connected. Furthermore, the gap spacer itself is also desired to have high mechanical strength. Conventionally, in order to form a magnetic gap of several microns or less in a magnetic head with a ferrite core, a non-magnetic material such as glass is inserted as a foil into the gap, or a film is formed by sputtering or vapor deposition, or A method is used in which a glass paste is applied, dried, and then heated and fused to a temperature higher than the softening temperature of the glass. This results in
By firmly welding the tape to ferrite with a predetermined working gap width, the problem of chipping of the gap edges when the tape runs in contact with a magnetic head is prevented. However, in recent years, in order to further improve the performance of tape head systems, that is, to meet the demand for technological development for higher recording densities, ferrite has been replaced by (oxide-based) metals such as sendust and amorphous alloys as magnetic materials. There is an increasing need to use magnetic materials.

In magnetic heads using these metallic magnetic materials, when glass is used as a spacer, as in the case of using ferrite materials, the glass is heated and fused at the lowest possible temperature to prevent the characteristics of the magnetic material itself from deteriorating. Therefore, for example, PbOB2O3, PbO-8
102, pbo P2O5-PbOZnOB2O3,z
No B2O38102-based low melting glass is used. However, unlike the case of ferrite, metal magnetic materials contain metal components that have a strong tendency to stabilize by forming oxides, such as %Fe#81.
On the other hand, low-melting glass contains components that bond weakly with oxygen, such as PbO and ZnO, and generally, glass with a lower melting point contains many of these oxides that are easily reduced. Therefore, when glass fusion is performed in the same manner as for ferrite, the metal magnetic material and the glass react, and metals such as PB and ZN are precipitated. These precipitations weaken the bond with the magnetic core, reduce the mechanical strength and abrasion resistance of the glass itself as a gap spacer, and become a significant factor in deteriorating the characteristics of the magnetic head.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems in manufacturing a gap portion of a magnetic head using a magnetic metal as a magnetic core.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings, in which a magnetic head is formed by making two U-shaped magnetic cores, which are the most common head shape, face each other.

<Example 1> As shown in FIG. 2, the front air gap forming surface 2 and the pack air gap forming surface 3 of the magnetic core 1 having a U-shaped cross section are finished to be sufficiently mirror-finished and coplanar, and a metal magnetic material is applied to the surfaces. For example, as a film to prevent the reaction between sendust and the glass layer formed later and to suppress metal precipitation from the glass.
5i0,4 is applied by sputtering.

A high frequency sputtering device is used for sputtering, and 8i
Sputtering was performed using Ar gas containing 5 to 20% of 02 to a 02 target. By using a gas containing 02, a dense film of 8i0z can be obtained. Further, the film thickness can be easily controlled by sputtering time.

Next, as shown in FIG. 1, a low melting point Pb OB2011 glass film 5 is used as an adhesive for the air gap spacer and the magnetic core 1.
is deposited on the 5i02 film 4 by sputtering as shown in FIG.

For sputtering, a high-frequency sputtering device is used, and as a target, for example, PbOB2O3 glass containing 70 wt% or more of PbOe is used.
% of Ar gas was used to obtain an ivy film 5 close to the target composition.The film thickness was controlled by
Depending on the time span.

Thereafter, as shown in Figure 1, the magnetic cores 1 and 1' are heated together under pressure at a temperature of around 500C.
The glass films 5 are fused together, and the glass 5 further diffuses toward the SiO2 film 4 during heating.

Here, the amount of diffusion of the glass 5 into the SiO2 film 4 can be controlled by changing the film thickness structure of the initial films 4 and 5, or by changing the heat treatment temperature and time. Therefore, if these conditions are selected appropriately, the glass 5 will diffuse toward the 8102 film, but eventually a magnetic gap can be obtained without letting it reach the sendust. For example, in Fig. 2, the 8j02 film 4 is attached to 1.0 μm and the glass film 5't is 1.0 μm thick, and 50
After heat treatment at 0C for 15 minutes, glass 5 and 8102
are mutually diffused, and about 0.5 μm of the 8jOz film remains.

In addition, 8 (02 film 4 is 1.5 μm, glass film 5 is 0.4
pm and heat treatment at 450C for 15 minutes leaves about 0.05 μm of the 8102 film.

In this way, by using the Si Q2 film, it is possible to prevent the glass 5 from reacting with the sendust, and therefore the 5f
It is possible to avoid the problem that when adhering under the same conditions without the 02 film, metallic lead is precipitated in the glass, weakening the bond between the sendust and the glass, and reducing the strength of the glass itself as a gap spacer.

In the above, 5iO2'f: was used as a reaction prevention film, but
In addition, At20s 1Zr02. It is also possible to use stable oxides with high melting points such as TiO2 and MgO, oxides that do not reduce glass such as SnO2, and compounds consisting of combinations thereof.

<Example 2> Ti is deposited as the reaction prevention film 4 in FIG. 2 by vapor deposition.

For vapor deposition, Ti is placed in a crucible, heated with a heater, and vapor-deposited in a vacuum. Time, temperature, etc. are adjusted in advance and controlled so that a predetermined thickness is achieved.

Thereafter, a magnetic gap is formed by the same method as in Example 1.

Ti is good as a preventive film because it does not react with glass relatively easily and can be deposited densely at a relatively high temperature.

In addition, a metal film that is nonmagnetic and relatively difficult to react with glass can be used as a reaction prevention film.

Furthermore, BN, for example, is used as a protective film for LSIs and as a coating material for functional materials, and has particularly excellent corrosion resistance against molten glass.

Non-magnetic non-oxide ceramics such as S 13N4 s SIC are also excellent phase materials for the reaction prevention film 4.

〔Effect of the invention〕

According to the present invention, metal is not precipitated in the glass particles filled in the voids, and therefore it is possible to obtain magnetic voids with high mechanical strength and wear resistance.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a magnetic hend core obtained by the method of the present invention, and FIG. 2 is a sectional view of the magnetic hend core in a manufacturing process for explaining one embodiment of the present invention.

Claims (1)

[Claims] 1. In the manufacturing process of a magnetic head having a magnetic core made of a metallic magnetic material, a low melting point glass is formed on each of the opposing surfaces of the pair of magnetic heads, and the glass is heated and fused together at a low temperature. When doing,
A method of manufacturing a magnetic head, comprising forming a film between the low melting point glass and the magnetic material to prevent a reaction between the low melting point glass and the metal magnetic material.