JPH0660319A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the deterioration of recording and reproducing characteristics by preventing the diffusion between magnetic metallic films and glass films. CONSTITUTION:The magnetic metallic films 10, 11 are respectively formed on the gap-facing surfaces of cores 8, 9 formed of a ferrite. Alumina films 12, 13 are respectively formed at 0.002 to 0.200mum on the magnetic metallic films 10, 11. Glass films 14, 15 are respectively formed on these alumina films 12, 13. As a result, the alumina films 12, 13 prevent the diffusion between the magnetic metallic films 10, 11 and the glass films 14, 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a magnetic recording / reproducing apparatus or the like.

[0002]

2. Description of the Related Art A conventional magnetic head will be described below together with a manufacturing method.

9 to 12 are perspective views showing a conventional method of manufacturing a magnetic head. In FIG. 9, 1 is a C-shaped core made of an oxide magnetic material such as ferrite,
The core 1 is provided with a winding groove 1a. Reference numeral 2 is an I-shaped core made of an oxide magnetic material such as ferrite. The gap facing surface of each of the cores 1 and 2 is processed by etching or the like, and is formed on the gap facing surface during processing. The altered layer is removed. Next, as shown in FIG. 10, metal magnetic films 3 and 4 are formed on the gap facing surfaces of the cores 1 and 2, respectively. The metal magnetic films 3 and 4 are formed by sputtering in an argon atmosphere. Next, as shown in FIG. 11, glass films 5 and 6 are formed on the metal magnetic films 3 and 4 by sputtering. Next, as shown in FIG. 12, the core 1 and the core 2 are butted so that the glass film 5 and the glass film 6 face each other, the bonding glass 7 is placed in the winding groove 1a, and the components are placed in an electric furnace. By heating at a predetermined temperature, the bonding glass 7 is welded so as to straddle the cores 1 and 2, and a magnetic head is manufactured.

[0004]

However, in the above-mentioned conventional structure, for example, a diffusion phenomenon occurs between the metal magnetic film 3 and the glass film 5, the magnetic characteristics of the metal magnetic film 3 deteriorate, and the recording / reproducing of the magnetic head is performed. There was a problem that the characteristics deteriorate.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a magnetic head capable of preventing deterioration of recording and reproducing characteristics.

[0006]

To achieve this object, an alumina film having a thickness of 0.002 μm to 0.200 μm is provided between the metal magnetic film formed on the core and the glass film.

[0007]

With this structure, diffusion between the metal magnetic film and the glass film can be prevented.

[0008]

EXAMPLE A magnetic head in one example of the present invention will be described below along with a manufacturing method.

1 to 5 are perspective views showing a method of manufacturing a magnetic head according to an embodiment of the present invention. First, as shown in FIG. 1, a C-shaped core 8 made of an oxide magnetic material such as ferrite and an I-shaped core 9 made of the same material as the core 8 are prepared. At this time, the core 8 is provided with the winding groove 8a. Further, the surfaces of the cores 8 and 9 that face the gaps are processed by etching or the like,
The work-affected layer caused by cutting or the like is removed from the surface facing the gap. Next, as shown in FIG. 2, metal magnetic films 10 and 11 are formed on the gap facing surfaces of the cores 8 and 9, respectively. The constituent material of this metal magnetic film is Fe-Ta-
A metallic magnetic material such as Zr is used, and the metallic magnetic film 1 is used.
0 and 11 have a thickness of 1.8 using means such as sputtering.
It is formed on the gap facing surface with a thickness of about μm. Next, as shown in FIG. 3, 0.002 μ of alumina (Al ₂ O ₃ ) films 12 and 13 are formed on the metal magnetic films 10 and 11, respectively.
It is formed with a thickness of m to 0.200 μm. The alumina films 12 and 13 are manufactured by using a method such as sputtering. Next, as shown in FIG. 4, glass films 14 and 15 are formed on the alumina films 12 and 13, respectively. This glass film 1
Reference numerals 4 and 15 are formed by means such as sputtering. When the glass films 14 and 15 are formed by the sputtering method, for example, SiO ₂ is used as a glass target.
30 wt%, PbO 50 wt%, Na ₂ O 7 wt
%, B ₂ O ₃ of 4 wt% and Fe ₂ O ₃ of 4 wt% are used. Next, as shown in FIG. 5, core 8 and core 9 are butted so that glass film 14 and glass film 15 face each other, and bonding glass 16 (SiO _{2
-PbO-Li 2 O-Na 2} O-K 2 O-Al 2 O 3 based glass, transition point 372 ° C.) to insert the, by heating at a temperature around 550 ° C. accommodates this construct into an electric furnace Core 8 and core 9
To join.

At this time, the alumina films 12 and 13 have a thickness of 0.002.
If it is not formed with a thickness of not less than μm, diffusion between the glass film and the metal magnetic film cannot be prevented. Further, since the total thickness of the glass film and the alumina film must be a predetermined magnetic gap, if the alumina film is too thick, the glass film must be necessarily thin. Then, since the bonding strength between the gap facing surfaces is poor,
Not preferable. Therefore, the alumina film is at most 0.200
It is desirable that the thickness is μm or less.

FIG. 6 is a diagram showing the diffusion region when the alumina film is 0.002 μm in Auger intensity of Fe, Al and O. Fe is in the cores 8 and 9 and the metal magnetic films 10 and 1.
Al contained in 1 and Al contained in the alumina films 12 and 13,
O is contained in the cores 8 and 9, the alumina films 12 and 13, and the glass films 14 and 15. As can be seen from FIG. 6, in this embodiment, the Fe component in the metal magnetic films 10 and 11 is the glass film 1.
It can be seen that it has not spread in 4,15. Therefore, the metallic magnetic films 10 and 11 are not magnetically deteriorated.

FIG. 7 is a diagram showing the diffusion region when the alumina film has a thickness of 0.03 μm by Auger intensity of Fe, Al and O. As can be seen from FIG. 7, the metal magnetic film 1 is used in this embodiment.
It can be seen that the Fe component in 0 and 11 did not diffuse into the glass films 14 and 15. Therefore, the metallic magnetic films 10 and 11 are not magnetically deteriorated.

FIG. 8 shows the diffusion region of the conventional example (shown in FIG. 12), that is, the diffusion region of the magnetic head in which the alumina film is not formed.
It is a figure when it shows with the Auger intensity of e, Al, and O. As can be seen from FIG. 8, the diffusion occurs between the metal magnetic films 3 and 4 and the glass films 5 and 6.

As described above, in this embodiment, the alumina film 1 is used.
2 and 13 are the metal magnetic films 10 and 11 and the glass film 1, respectively.
The thickness between 0.004 μm and 0.
The metal magnetic films 10 and 11 are formed by the formation of 200 μm.
Since the diffusion phenomenon, especially the diffusion of the Fe component in the metal magnetic film, is suppressed between the metal film and the glass films 14 and 15, it is possible to prevent the deterioration of the magnetic characteristics of the metal magnetic film and the deterioration of the recording / reproducing characteristics of the magnetic head. It can be prevented.

[0015]

According to the present invention, a thickness of 0.002 μm to 0.200 is provided between the metallic magnetic film formed on the core and the glass film.
By providing the alumina film of μm, it is possible to prevent the diffusion between the metal magnetic film and the glass film, so that it is possible to prevent the recording and reproducing characteristics from being deteriorated.

[Brief description of drawings]

FIG. 1 is a perspective view showing a method of manufacturing a magnetic head according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a method of manufacturing a magnetic head according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a method of manufacturing a magnetic head in one embodiment of the present invention.

FIG. 4 is a perspective view showing a method of manufacturing a magnetic head according to an embodiment of the present invention.

FIG. 5 is a perspective view showing a method of manufacturing a magnetic head according to an embodiment of the present invention.

FIG. 6 is a diagram showing the diffusion region of the magnetic head in one embodiment of the present invention by Auger intensities of Fe, Al, and O.

FIG. 7 is a diagram showing the diffusion region of the magnetic head in one embodiment of the present invention by Auger intensities of Fe, Al, and O.

FIG. 8 shows Fe, Al, O in the diffusion region of the conventional magnetic head.
Figure showing the Auger intensity

FIG. 9 is a perspective view showing a conventional method of manufacturing a magnetic head.

FIG. 10 is a perspective view showing a method of manufacturing a conventional magnetic head.

FIG. 11 is a perspective view showing a method of manufacturing a conventional magnetic head.

FIG. 12 is a perspective view showing a method of manufacturing a conventional magnetic head.

[Explanation of symbols]

 8 core 9 core 10 metal magnetic film 11 metal magnetic film 12 alumina film 13 alumina film 14 glass film 15 glass film

Claims (1)

[Claims] 1. A core having a metal magnetic film formed on the surface facing the gap, and 0.002 μm to 0.200 on the metal magnetic film.
An alumina film having a thickness of μm, a glass film provided on the alumina film to serve as a magnetic gap, and another core abutted on the core via the glass film are characterized. And a magnetic head.