JPH0258711A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the characteristics of the magnetic head by forming thin nonmagnetic oxide films to a part between ferromagnetic metal oxide materials and a thin metallic film having a high saturation magnetic flux density and forming thin films of metal chromium to the rest. CONSTITUTION:The thin nonmagnetic oxide films 7 are formed to a part be tween the ferromagnetic metal oxide materials 1, 2 and the thin metallic film 9 having the high saturation magnetic flux density and the thin meal chromium films 8 are formed to the rest. Namely, the thin nonmagnetic oxide films and the metal chromium films are alternately formed by dispersing these films to the boundary between 'SENDUST(R)' and ferrite, by which the characteristic deteriorated layers consisting of the metal chromium are formed like waveforms on the joint surfaces of the 'SENDUST(R)' and the ferrite and since these layers are nonparallel with a magnetic gap, the layers do not act as a pseudo gap. In addition, the the joint strength is improved by the inter-diffusion in the parts formed with the thin metal chromium films and, therefore, the genera tion of boundary exfoliation, etc., is obviated even when these parts are subjected to thermal stress. The high-quality magnetic head having no pseudo gap effect is provided in this way.

Description

[Detailed Description of the Invention] The present invention provides a magnetic recording medium capable of high-density recording on metal-based magnetic recording media, etc.
This invention relates to IG (Meta I-I n-Gap) type magnetic heads, and in particular to manufacturing technology for improving the characteristics of magnetic heads in which the metal ferromagnetic material forming surface is parallel to the gap (hereinafter referred to as parallel type MIG). .

For example, a general parallel MIG hend will be described below with reference to FIG. 6.

As shown in FIG. 6(a), a metal thin film 23 having a high saturation magnetic flux density, such as Sendust, is formed on the gap forming surfaces of a pair of magnetic cores 21 and 22 made of ferrite, which is a metal oxide ferromagnetic material, and Furthermore, a non-magnetic thin film 24 is formed as a gap spacer, and then joined together with a glass to form a parallel MIG henoto core chip.

However, in this type of magnetic head, since the boundary surface 27 between the sendust film and the ferrite core is parallel to the magnetic gap forming surface, it acts as a pseudo gap surface and a pseudo signal is included in the reproduced signal.

Therefore, methods have been proposed in which a thin metal film such as permalloy or chromium is interposed as a buffer layer to reduce the thermal stress strain at the interface between sendust and ferrite, and to increase the bonding strength at the interface.

Although these metal thin films are effective against thermal stress distortion, they are not effective against deterioration of magnetic properties near the joint interface due to reduction due to the bonding of oxygen atoms in ferrite with metal atoms and diffusion of metal atoms into sendust. There wasn't.

Therefore, as shown in FIG. 6(b), a method has been proposed in which a thin film 26 of non-magnetic oxide M2O3 or 5102 is formed at the junction interface between sendust and ferrite as a very thin diffusion prevention film.

By the way, these diffusion prevention films can prevent the formation of a layer with deteriorated ferrite properties, but since they are non-magnetic layers, if the film is thin, it may itself form a pseudo gap, or if the film is thin, diffusion may occur. 300-60 as it may not be possible to prevent
It was necessary to control the thickness of the diffusion prevention film within a very narrow range of 0A.

Furthermore, since mutual diffusion is prevented between the ferrite and the anti-diffusion film, and between the sendust and the anti-diffusion film, the bonding strength is weak and the difference in thermal stress between the sendust and the ferrite cannot be absorbed, resulting in peeling. there were.

1. The present invention is proposed in view of the above problems, and includes a non-magnetic ferromagnetic oxide thin film in a part between the metal oxide ferromagnetic material and the metal thin film having high saturation magnetic flux density. The feature is that a thin metal chromium film is formed on the remaining part.

1.According to the present invention, since the non-magnetic oxide thin film and the metallic chromium film are dispersed and created alternately at the interface between the sendust and the ferrite, a property-degrading layer due to the metallic chromium or a corrugated shape is formed on the joint surface of the sendust and the ferrite. formed and it is nonparallel to the magnetic gap, so it does not act as a pseudogap.

In addition, in the metallic chromium and thin film formed portion, the bonding strength is improved by mutual diffusion, so that interfacial peeling does not occur even under thermal stress.

One Practical Example - One embodiment of the present invention will be described with reference to FIGS. 1 and 2.

As shown in Fig. 2, first, a pair of ferromagnetic metal oxide core materials 1 and 2 such as ferrite are prepared, and the winding locking groove 3, winding window groove 4, glass Grooves 5 and track grooves 6 are formed by cutting.

Next, as shown in FIG. 3, the magnetic gap forming surface of one core is masked and a thin film 7 of non-magnetic oxide (for example, Ae20a) is applied in stripes in the track width direction at a thickness of 50 to 800 nm.
Form by sputtering about i.

Next, the mask is shifted and metal chromium 8 is sputtered to approximately the same thickness on the portions where the nonmagnetic oxide is not deposited.

Furthermore, as shown in FIG. 4, a ferromagnetic metal thin film 9 such as sendust is formed to a thickness of 2 to 10 μm, and a non-magnetic thin film 10 such as 5102, which will become a gear tube spacer, is sputtered to a predetermined thickness.

Next, both core blocks are stabilized, glass is poured in them, and the core blocks are integrated and sliced to obtain a magnetic rad core chip 11 as shown in FIG.

In the magnetic herad core chip made in this way, a metal chromium diffusion layer and a reduction layer are formed in the sendust part and ferrite part near the metal chromium thin film forming part in a waveform 12 in the track width direction by high-temperature heating in the glass fusing process. is formed.

These metal chromium diffusion layers and reduced layers have deteriorated magnetic permeability, so they form a sub-gap, but since they are non-parallel to the main gap, they do not act as a pseudo-gap.

Furthermore, since these interdiffused layers form a strong bond, interfacial separation between sendust and ferrite due to thermal stress does not occur.

Did we explain the example above in which the nonmagnetic oxide layer and chromium layer are formed in stripes perpendicular to the track?
It may also be formed in a mesh shape as shown in FIG.

Further, the thin film may be formed by a method such as etching using a photolithography technique instead of the method described above in which it is formed using a mask.

Light'R and Plate - As described below, the present invention tracks a non-magnetic ferromagnetic oxide thin film and a metal chromium thin film between a metal oxide ferromagnetic material and a metal thin film having a high saturation magnetic flux density. 1) Since they are formed alternately in stripes or meshes in the direction, metallic chromium is diffused into the bonding surface of sendust and ferrite during high-temperature heat treatment such as glass fusion in the later process, and a layer with deteriorated properties or a corrugated shape is formed. , it does not work as a pseudo gap because it is non-parallel to the magnetic gap.

Moreover, since the bonding strength is improved due to interdiffusion in the metallic chromium thin film forming area, interfacial peeling and the like do not occur even in response to thermal stress.

Therefore, it is possible to provide a highly reliable, high-quality magnetic head free of pseudo-gap effects.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of a main part near the gap of a magnetic head core chip according to a first embodiment of the present invention, FIG. 2 is a perspective view of a magnetic head core block of the embodiment, and FIG. 3 is a perspective view of the magnetic head core block of the embodiment. FIG. 4 is a perspective view of the main part showing the state of non-magnetic oxide and metal chromium thin film formed in this example. FIG. FIG. 6, which is a perspective view showing another embodiment of the present invention, is an enlarged view of the main part near the magnetic held gap of the conventional example. 1.2...Ferromagnetic metal oxide core (ferrite), 3
...Winding locking groove, 4...Winding window groove, 5...Glass groove, 6...Track groove, 7...Nonmagnetic oxide thin film (Ae203), 8...Metal chrome thin film,

Claims (2)

[Claims] (1) In a magnetic head in which a metal thin film having a high saturation magnetic flux density is formed on at least one magnetic gap forming surface of a pair of metal oxide ferromagnetic materials, the metal oxide ferromagnetic material and a metal thin film having a high saturation magnetic flux density are formed. A magnetic head characterized in that a non-magnetic oxide thin film is formed in a part between the two and a thin metal chromium film is formed in the remaining part. (2) A magnetic head according to claim 1, characterized in that nonmagnetic oxide thin films and metal chromium thin films are alternately formed in stripes in the track width direction.