JPH02249111A - Magnetic head - Google Patents

Abstract

PURPOSE:To reduce a pseudo gap formed between a ferrite core and a magnetic metallic film by interposing an Si thin film layer between one of the ferrite cores and the magnetic metallic film. CONSTITUTION:The magnetic metallic film 4 and gap glass 5 are interposed to a gap 3 part formed between the confronting planes of an I-type ferrite core 1 and a U-type ferrite core 2. And the Si thin film layer 7 is interposed between the magnetic metallic film 4 and the I-type ferrite core 1. At such a case, partial Si in the Si thin film layer reacts to ferrite by heat generated when two ferrite cores 1 and 2 are joined with bonding glass 6, which produces SiO2. However, since the film thickness of the Si thin film layer 7 is thin, a nonmagnetic part formed between the magnetic metallic film 4 and the ferrite core 1 is also formed thin. Thereby, it is possible to suppress the occurrence of the pseudo gap to the extent of not generating problem in practical use.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic head, and more specifically to a gear 1
This invention relates to the improvement of a metal-in-gap type magnetic head in which a magnetic metal or film with a high saturation magnetic flux density is interposed in the knob.

(Prior Art) In recent years, due to the demand for higher recording density in magnetic disk devices, research and development have been conducted on MIG (metal-in-gap) heads in which a magnetic metal film with a high saturation magnetic flux density is provided in the gap portion. An example of this type of magnetic head is shown in FIG.

That is, as shown in the figure, a gap 3 is formed by combining an elongated prismatic I-type ferrite core 1 and a substantially U-shaped U-shaped ferrite core 2. At this time, the I-type ferrite core A magnetic metal film 4 with high saturation density is formed by sputtering or the like on the opposite surface of the U-shaped ferrite core 2, and a gap glass, which is a non-magnetic shield, is further formed between the magnetic metal film 4 and the opposite surface of the U-shaped ferrite core 2. 5(
high melting point). And this gap glass 5
becomes a substantial gap portion for reading and writing data, and the width of the gap glass 5 becomes the gap width. moreover,
The parts of the I-type ferrite core 1 and the U-type ferrite core 2 near the gear 3 are bonded and integrated using a bonding glass 6 made of low-melting glass.

Note that the magnetic metal film 4 is generally made of sendust (Fe
-Al1-3 f) is used.

(Problems to be Solved by the Invention) However, in the above-described conventional magnetic head, both ferrite cores 12 are bonded together using the bonding glass 6.
At this time, it is necessary to melt the low-melting glass, and the heat generated at that time causes an interfacial reaction between the type ferrite core 1 and the magnetic metal film 4, and a non-magnetic material layer (approximately 40
(0 to 600 people) will be formed. Then, non-magnetic material parts are placed in the gap 3 on both sides of the magnetic metal film 4, and these magnetic material parts of both valves function as a gap (regardless of its performance). I end up having sex.

As a result, as shown in FIG. 5, there is a problem in that the output voltage changes due to the relative movement of the magnetic head and the storage medium, and the waveform does not become clear, resulting in distortion (occurrence of a pseudo gap). This distortion is caused by the presence of a nonmagnetic abrasive layer between the above-mentioned I-type ferrite core 1 and magnetic metal film 4.

The present invention has been made in view of the above-mentioned background, and an object thereof is to provide a magnetic head that can reduce the occurrence of pseudo gaps.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a magnetic head according to the present invention has a gap in which two ferrite cores are combined and is bonded with bonding glass, and a magnetic metal film is provided in the gap. In the magnetic head, a Si thin film layer was disposed between the magnetic metal film and the ferrite core.

(Function) In the present invention, Si is formed between the magnetic metal film and the ferrite core.
Because a thin film layer is provided, the heat generated when bonding two ferrite cores with bonding glass causes Si to
Some Si in the thin film layer reacts with ferrite, and S Io
, becomes 2. However, since the Si thin film layer is thin, the non-magnetic part formed between the magnetic metal film and the ferrite core is also thin, and since Si has a lower oxidation energy than Affl, the non-magnetic part formed The portion becomes thinner, and the occurrence of pseudo gaps can be suppressed to a level that poses no problem in practice.

Furthermore, the presence of the Si thin film layer prevents the oxidation reaction of the magnetic metal film.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an enlarged view of essential parts showing an embodiment of the present invention. As shown in the figure, basically as in the conventional case, a magnetic metal film 4 and a gap glass 5 are formed in a gap 3 portion formed between the facing surfaces of the I-type ferrite core 1 and the U-type ferrite core '2. It has been interposed.

In this embodiment, sendust is used as the magnetic metal film 4.

Here, in the present invention, a Si thin film layer 7 is interposed between the magnetic metal film 4 and the I-type ferrite core 1. The number of the Si thin film layer 7 is approximately 50 to 200, preferably 100.

FIG. 2 is a graph showing the relationship between the thickness of the Si thin film layer 7 and the pseudo gap output. As is clear from the figure, the occurrence of pseudo gaps can be minimized when the film thickness is approximately 100 mm, and increases as the thickness of the Si thin film layer 7 increases (decreases). This is because the pseudo gap increases as the film thickness increases.
This is because the material itself is a non-magnetic material. Conversely, the pseudo gap increases as the film thickness decreases because the Si thin film layer 7 becomes too thin and cannot suppress the interfacial reaction occurring between the magnetic metal film 4 and the ■-type ferrite core 1.

Note that this Si thin film layer 7 may be formed, for example, on the surface of the I-type ferrite core 1 by sputtering or the like. Thereafter, a magnetic head is manufactured according to normal steps.

(Effects of the Invention) As described above, according to the magnetic head of the present invention, since the Si thin film layer is interposed between one of the ferrite cores and the magnetic metal film, it is used when joining two ferrite cores. The oxidation reaction of the magnetic metal film can also be suppressed by the heat generated when the bonding glass is melted. Since the pseudo cap formed between the ferrite core and the magnetic metal film is approximately equivalent to the width of the Si thin film layer, the output waveform of the magnetic head is almost ineffective in practical use, as shown in Figure 3. It will be soft enough to cause no problems.

[Brief explanation of drawings]

FIG. 1 is an enlarged view of the main parts of a preferred embodiment of the magnetic head according to the present invention, FIG. 2 is a graph showing the relationship between the thickness of the Si thin film layer and the amount of pseudo gaps generated, and FIG. FIG. 4 is a graph showing characteristics of the head. FIG. 4 is a graph showing a conventional magnetic head. FIG. 5 is a graph showing characteristics of a conventional magnetic head. 1...■ type ferrite core 2...U type ferrite core 3...Gap 5...Gap glass 7...Si thin film layer 4...Magnetic metal film 6...Bonding glass Fig. 2 Figure 3 Figure 5

Claims (1)

[Claims] A magnetic head in which a gap in which two ferrite cores are combined is bonded with a bonding glass and a magnetic metal film is provided in the gap, and a Si thin film layer is disposed between the magnetic metal film and the ferrite core. A magnetic head characterized by: