JPH04325906A - Magnetic head - Google Patents

Abstract

PURPOSE:To provide the high-performance magnetic head by suppressing the reaction between the ferrite cores and metallic films in the MIG head having good productivity thereby decreasing pseudo signals. CONSTITUTION:At least three layers; layers consisting of soft magnetic films 14 contg. nitrogen, layers 15 consisting of soft magnetic films without contg. the nitrogen, and layers 14 consisting of soft magnetic films contg. the nitrogen are provided, successively from the ferrite core 12 side of the soft magnetic films 13 between antireaction layers 17 and soft magnetic films 13 in the head of the MIG type disposed with the soft magnetic films in the gap part of the ferrite cores.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, and particularly to a so-called MIG type magnetic head in which a magnetic material having a high saturation magnetic flux density and high magnetic permeability is arranged in a magnetic gap.

0002

[Background Art] In recent years, advances in video, audio, and information-related equipment have been remarkable. The mainstream of recording in these fields is magnetic recording, and due to the strong demand for higher recording densities, efforts are being made to develop high coercive force metal media and magnetic heads with sufficient recording capacity to meet this demand. It is progressing.

Regarding magnetic heads, a wide variety of magnetic heads using materials such as Sendust, Co-based amorphous, and Fe-based alloys having high saturation magnetic flux density have been developed, and some of them have already been put into practical use. Among them,
The so-called parallel gap type MIG head, which has a main core made of magnetic ferrite and a metal magnetic film with high saturation magnetic flux density and high magnetic permeability formed parallel to the gap, has a relatively simple structure and high productivity. Although it has the advantage of being rich in ferrite, it has been difficult to put it into practical use because pseudo signals are generated due to the generation of pseudo gaps at the interface between the ferrite and metal film due to reaction and diffusion during heat treatment. Therefore, in recent years, metal films with compositions that have less reaction with ferrite and less diffusion,
Research is being conducted on combinations of nitrided and non-nitrided layers, non-magnetic reaction prevention films, etc., and parallel gap type MIG heads are also being put into practical use. (For example, "Journal of Japan Applied Magnetics Society" 12, 103-106 (1988) or "Journal of Japan Applied Magnetics Society" 13, 277-280 (1989))

[
0004

Generally, in order to increase the strength of the head, it is desirable to use glass that has a high working temperature. However, it is difficult to withstand heat treatment of about 600° C. or higher with a metal film having a composition that is less likely to react or diffuse with ferrite, or with a combination of a nitrided layer and a non-nitrided layer. Furthermore, when using a metal film with a composition that has little reaction with ferrite or diffusion, the materials are limited, and general magnetic materials that have already been developed and are used in other types of heads can be used as they are. There was a restriction that it was not possible. Furthermore, when a nonmagnetic reaction prevention film is used, there is a problem in that as the heat treatment temperature increases, the required film thickness increases, and the nonmagnetic film itself causes a pseudo gap.

In view of the above-mentioned problems, the present invention applies a metal magnetic film with high saturation magnetic flux density and high magnetic permeability that has already been put into practical use as is to a parallel gap type MIG head with a simple structure and high productivity. An object of the present invention is to provide a magnetic head in which almost no pseudo gap is generated even when heat treatment is performed at a high temperature.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the magnetic head of the present invention includes a soft magnetic film disposed in the cap portion of the ferrite core, and a reaction prevention layer formed between the soft magnetic film and the ferrite. In the MIG type head, at least three layers are provided in order from the ferrite side of the soft magnetic film: a layer of soft magnetic film containing nitrogen, a layer of soft magnetic film not containing nitrogen, and a layer of soft magnetic film containing nitrogen. It has the following configuration.

[0007]

[Operation] By using the above-mentioned reaction prevention layer together with a combination of a nitrided layer and a non-nitrided layer, the present invention enables heat treatment at a high temperature that could not be achieved with the combination of a nitrided layer and a non-nitrided layer alone. In addition, when using only a reaction prevention layer, the required film thickness increases as the heat treatment temperature increases, and the reaction prevention layer itself causes a pseudo gap, but by using it in conjunction with a combination of nitrided and non-nitrided layers, Even during heat treatment at a high temperature of about 600° C., the reaction between the soft magnetic film and the ferrite can be sufficiently suppressed with a sufficiently thin layer thickness that does not pose a problem as a pseudo gap.

That is, the parallel gap type MIG head has a simple structure and is highly productive, and glass with a high working temperature can be used to increase the strength of the head without deteriorating the head characteristics due to the influence of the pseudo gap. , it is possible to achieve both productivity, good magnetic properties, and reliability.

[0009]

【Example】

(Embodiment 1) A magnetic head according to a first embodiment of the present invention will be described below with reference to the drawings. (FIG. 1) is a plan view showing the vicinity of the gap between the sliding surface of the magnetic head of the present invention and the magnetic recording medium.
FIG. 3 is a plan view showing the vicinity of the gap between the sliding surface of the G-type magnetic head and the magnetic recording medium.

[0010] In (FIG. 1), (FIG. 2), and (FIG. 3),
11 is a main gap, 12 is a ferrite core, and 13 is a soft magnetic thin film, which in this embodiment is CoNbZr or FeAlSi. 14 is a nitride layer, in this example CoNbZrN or FeAlSiN, 1
5 is a non-nitrided layer, which is the same as 13 in this embodiment. 16 is a molded glass, and 17 is a reaction prevention film, which is SiO2 in this example. In this example, the thickness of the soft magnetic film 13 in FIGS. 1, 2, and 3 is 4 μm, and the thickness of the nitride layer 14 in FIGS. The thickness of one layer of the nitride layer 15 is 27 nm,
The nitrogen content in the nitride layer 14 is approximately 9% in atomic percent (Fig.
) has a SiO2 thickness of 5 nm, and (FIG. 2) has a SiO2 thickness of 5 nm, 10 nm, and 20 nm.

The characteristics of the magnetic head constructed as described above will be explained below using Table 1.

(Table 1) shows (Figure 1), (Figure 2) and (
This figure shows the reaction between the ferrite and the soft magnetic film when the magnetic head shown in FIG. 3) is heat-treated at various temperatures. Reactions were analyzed by Auger electron spectroscopy, and those with almost no reaction were rated ○, those with a little reaction were rated △, and those with a considerable amount of reaction were rated ×.

[0013]

[Table 1] From (Table 1), the head that uses the combination of the nitrided layer and non-nitrided layer of the present invention together with the reaction prevention layer is superior to the conventional head (Fig. 3).
It can be seen that heat treatment can be performed at higher temperatures without causing any reaction compared to the head with the above configuration. Also, conventional (Fig. 2)
It can be seen that the same reaction prevention effect can be obtained with a thinner reaction prevention layer compared to the head with the configuration shown in FIG.

As described above, according to this embodiment, by using a combination of a nitrided layer and a non-nitrided layer and a reaction prevention layer, a high saturation magnetic flux density, which has already been put into practical use, can be achieved.
Even if the metal magnetic film with high magnetic permeability is applied as it is to a parallel gap type MIG head with a simple structure and high productivity, the diffusion of elements between the soft magnetic film and the ferrite can be achieved even when heat treatment is performed at high temperatures. It is possible to reduce the thickness of the reaction prevention layer, which itself causes a pseudo gap, and thus to provide a MIG head with less influence of pseudo gaps.

(Embodiment 2) A magnetic head according to a second embodiment of the present invention will be described below with reference to (FIG. 1) and (Table 2).

(Table 2) shows the reaction between the ferrite and the soft magnetic film when various materials are used for the reaction prevention layer 17 of the magnetic head shown in (FIG. 1) and heat treated at 600°C. This shows the situation. Reactions were analyzed by Auger electron spectroscopy, and those with almost no reaction were rated ○, those with a little reaction were rated △, and those with a considerable amount of reaction were rated ×.

[0017]

[Table 2] From Table 2, it can be seen that in the head that uses the combination of the nitrided layer and non-nitrided layer of the present invention in combination with the reaction prevention layer, the reaction prevention layer with a thickness of 5 nm or less prevents reactions well even in heat treatment at 600°C. I can see that it's done.

As described above, according to this embodiment, by using a combination of a nitrided layer and a non-nitrided layer and a reaction prevention layer, the elements between the soft magnetic film and the ferrite can be maintained even during heat treatment at 600°C. The thickness of the reaction prevention layer, which is itself a cause of pseudo gaps, can be reduced to 5 nm or less.
G head can be provided.

In this embodiment, the soft magnetic film 13 is made of Co
Although NbZr or FeAlSi is used, other soft magnetic materials may be used. Further, when the soft magnetic film 13 is made of nitride, the layer on the side far from the ferrite of the nitride layer 14 is not necessarily necessary.

[0020]

As described above, the present invention provides an MIG type head in which a soft magnetic film is disposed on the cap portion of a ferrite core, and a reaction prevention layer is formed between the soft magnetic film and the ferrite. At least in order from the ferrite side of
By having a configuration of three layers: a soft magnetic film layer containing nitrogen, a soft magnetic film layer not containing nitrogen, and a soft magnetic film layer containing nitrogen, a parallel gap with a simple structure and high productivity can be achieved. In the MIG head, it is possible to use glass with a high working temperature to increase the strength of the head without deteriorating the head characteristics due to the effects of pseudo gaps, and it is possible to achieve both productivity, good magnetic characteristics, and reliability. becomes.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the vicinity of the gap between the sliding surface of the magnetic head and the magnetic recording medium of the present invention.

FIG. 2 is a plan view showing the vicinity of the gap between the sliding surface and the magnetic recording medium of a conventional MIG type magnetic head using a reaction prevention layer.

FIG. 3 is a plan view showing the vicinity of the gap between the sliding surface and the magnetic recording medium of a conventional MIG type magnetic head in which reactions are prevented by a combination of a nitrided layer and a non-nitrided layer. 11 Main gap 12 Ferrite core 13 Soft magnetic film 14 Nitrided layer 15 Non-nitrided layer 16 Mold glass 17 Reaction prevention layer

Claims (3)

[Claims] 1. In a MIG type head in which a soft magnetic film is disposed on the cap portion of a ferrite core, and a reaction prevention layer is formed between the soft magnetic film and the ferrite, at least nitrogen is added in order from the ferrite side of the soft magnetic film. 1. A magnetic head comprising three layers: a soft magnetic film layer containing nitrogen, a nitrogen-free soft magnetic film layer, and a nitrogen-containing soft magnetic film layer. 2. The magnetic head according to claim 1, wherein the reaction prevention layer is any one of a silicon oxide, an aluminum oxide, and a platinum group element. 3. The magnetic head according to claim 1, wherein the reaction prevention layer is made of SiO2.