JPH0519762B2 - - Google Patents

Abstract

PURPOSE:To improve recording and reproducing characteristics by removing property-deteriorated layers generated on the surface of a ferrite substrate and forming 1st thin ferromagnetic films having large anisotropy thereon and further 2nd thin ferromagnetic films having small anisotropy thereon. CONSTITUTION:Surfaces 7, 7 to face a gap are finished to specular surfaces by lapping, etc. The work deteriorated layers on the surfaces are removed by etching using mechanochemical, chemical etching, sputtering devices, etc. in succession of the lapping. The 1st thin ferromagnetic films 3, 3 formed by depositing a ferromagnetic material having the strong intra-surface anisotropy (for example, Ni-Fe alloy, amorphous alloy) by a device for sputtering, etc., on the surfaces 7, 7. The thin ferromagnetic films 4, 4 are formed thereon by depositing a 'Sendust(R)' alloy (for example, Fe-Al-Si alloy, Fe-Si alloy) which is the ferromagnetic material having the intra-surface anisotropy substantially lower than the intra-surface anisotropy of the above-mentioned 1st thin ferromagnetic films.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of manufacturing a magnetic head used in a magnetic recording device.

BACKGROUND TECHNOLOGY In recent years, magnetic recording devices have been used in a wide range of fields as data storage devices, but in order to achieve excellent high recording density characteristics in these magnetic recording devices, thinning of the recording medium and high maintenance are required. Magnetization is necessary.

On the other hand, the magnetic head uses a ferromagnetic thin film (Fe-Al-Si) with high saturation magnetic flux density to prevent core saturation.
A magnetic thin film (Fe-Al-based alloy, etc.) is used near the gap in the bulk head.
Composite magnetic heads with ring heads using materials such as Si-based alloys are attracting attention. For this magnetic head,
It has the advantage that even high coercive force media can be recorded satisfactorily without magnetic saturation of the head.

Problems to be Solved by the Invention However, in the conventional magnetic head as described above, undulations occur in the frequency characteristics of the reproduced output as shown in Figure 2a, and isolated reproduced waveforms occur as shown in Figure 3a. There are problems in that distortion and a pseudo output portion A occur, and there are problems in practical use.

This phenomenon occurs because a pseudo-gap is formed between the ferromagnetic thin film and the core due to a non-magnetic layer or a layer with significantly deteriorated magnetic properties that is generated during the core wrapping process, and the gap functions similarly to a formal gap. It is something that happens in order to do something.

Means for Solving the Problems In order to solve the above problems, the present invention removes the altered layer on the surface of the core, deposits and forms a first ferromagnetic thin film on the surface, and then Said first
A magnetic head is constructed by depositing a second ferromagnetic thin film having smaller in-plane anisotropy than the ferromagnetic thin film.

Effect: There is no pseudo gap between the core surface and the ferromagnetic thin film.

Embodiment An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a side view of a ring head using ferrite, which is a composite magnetic head in which two ferromagnetic thin films are deposited at least near the gap.

The magnetic head of ferrite is composed of two cores 1 and 2 called an I-type core and a C-type core, and the gap-opposing surfaces 7 and 7 are finished to a mirror finish by wrapping, etc., and a non-woven material such as glass is used to maintain the gap length. They are joined as a head via the magnetic material 5.

The composite magnetic head of this example was manufactured using mechanochemical,
The damaged layer on the surface is removed by chemical etching, etching using a sputtering device, etc.
Furthermore, after that, a ferromagnetic material with strong in-plane anisotropy (for example, Ni-Fe alloy, amorphous alloy) is deposited on the surfaces 7, 7 using a device such as a sputter, and a first strong Magnetic thin films 3, 3 are formed, and a sendust alloy (for example, Fe-Al-
ferromagnetic thin films 4, 4 are formed.

As described above, the two cores 1 and 2 coated with two layers of ferromagnetic thin film are connected to each other with the surfaces on which the ferromagnetic thin film is located via a non-magnetic material 5 such as SiO having a thickness corresponding to the gap length. and configure the magnetic head. The above-mentioned ferromagnetic thin film can also be annealed to improve its characteristics, if necessary.

With such a configuration, continuous magnetic properties can be obtained between the ferrite and the ferromagnetic thin film, and formation of a nonmagnetic layer or a layer with significantly deteriorated magnetic properties at the interface can be avoided.

In the magnetic head with the above configuration, the frequency characteristics with respect to the reproduction output are as shown in FIG. 2b, and the isolated reproduction waveform is as shown in FIG.
It exhibited the excellent effect of being able to sufficiently record and reproduce even high coercive force media, which is an original feature.

Effects of the Invention The magnetic head of the present invention removes the altered layer that occurs when lapping the surface of the ferrite substrate, coats the first ferromagnetic thin film with large anisotropy on top of the altered layer, and then Since the second ferromagnetic thin film with small anisotropy is coated on the recording/reproducing characteristics, there is no waviness and there is little waveform distortion, which is extremely effective in practice.

[Brief explanation of the drawing]

FIG. 1 is a side view of a magnetic head according to an embodiment of the present invention, and FIG. 2 is a frequency characteristic curve diagram for explaining frequency waviness in a conventional composite magnetic head and a composite magnetic head according to an embodiment of the present invention. FIG. 3 is a characteristic curve diagram showing waveform distortion of the composite magnetic head. DESCRIPTION OF SYMBOLS 1...First core, 2...Second core, 3...First ferromagnetic thin film, 4...Second ferromagnetic thin film, 5...Gap, 6...Coil.

Claims (1)

[Scope of Claims] 1. After removing the process-affected layer on the surface of the opposing surface of the core sandwiching the gap portion, a first ferromagnetic thin film is deposited on the surface, and further anisotropy is applied to the first ferromagnetic thin film. A method of manufacturing a magnetic head, comprising depositing a second ferromagnetic thin film smaller than the first ferromagnetic thin film. 2. After removing the process-affected layer on the surface of the opposing surface of the core sandwiching the gap portion by etching, a first ferromagnetic thin film is deposited on the surface, and further anisotropy is formed on the surface of the first ferromagnetic thin film. The second smaller than the magnetic thin film
2. A method of manufacturing a magnetic head according to claim 1, further comprising depositing a ferromagnetic thin film. 3. A magnetic head according to claim 1 or 2, characterized in that an Fe-Ni alloy thin film is deposited on a ferrite core, and a sendust alloy thin film is deposited thereon. Production method.