JPS63149810A - Composite type floating magnetic head - Google Patents

Abstract

PURPOSE:To obtain a gap with high strength by decreasing the track width regulated by a metallic thin film than the track width of a core chip made of a ferrite. CONSTITUTION:A coil winding slot 2 is applied to a 1st core 1 made of a ferrite and a metallic magnetic thin film 2 made f a metal such as Fe-Al-Si alloy is formed on a face opposed to a 2nd core 3 with respect to the gap and a nonmagnetic films made of a material such as SiO2 to specify the length of gap is formed thereupon by sputtering. After the 1st and 2nd cores 1, 3 are incorporated by a high melting point glass 6 whose operating temperature is nearly 600 deg.C where the viscosity is 10<4> poise and grooving processing is applied while leaving a track width wider than a desired track width by nearly 2mum. Then the track slot 7 is packed by a low melting point glass 8 whose operating temperature is nearly 450 deg.C, the result is processed as a chip to obtain a core chip 10 having the metallic magnetic thin film 4 narrower than the width of the track part 9 made of ferrite. The chip 10 is imbedded to the slider 11 made of a nonmagnetic material such as Ca-TiO3 to obtain the magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite floating magnetic head used in a fixed magnetic disk device.

[Conventional technology]

In the core chip of a conventional composite type floating magnetic head, as shown in the perspective view of FIG. 3, a gold magnetic thin film 4 having the same width as the track portion 9 made of ferrite is attached to the 7 erite by sputtering or the like, and 1 magnetic gap is formed. It is defined by a non-magnetic film 5 and its periphery is protected by a low melting point glass 8.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, the gap is fixed only by holding the periphery of the gap with high melting point glass 6 and low melting point glass 8, but the fixing strength of the gap itself is poor, and cracks may occur from the gap. Easy◇Also, as the capacity increases, as the track width becomes smaller to increase the track density, the area where the ferrite gap meets becomes smaller, and the magnetic resistance of the core chip increases.
There is a point at which the recording and reproducing efficiency becomes low, and furthermore, processing becomes difficult. The present invention is intended to solve these problems, and its purpose is to provide a composite floating magnetic head that has high gap fixing strength and is superior in recording/reproducing efficiency and processability in the case of high track density. It's there to do.

[Means for solving problems]

The composite floating magnetic head of the present invention has a metal magnetic thin film with high saturation magnetic flux density in the gap part of a core chip made of ferrite, and the core chip is embedded in a slider made of a non-magnetic material. , the track width defined by the metal magnetic thin film is smaller than the track width of the core chip made of ferrite.

〔Example〕

An embodiment of a composite floating magnetic head according to the present invention is shown in FIG.
This will be explained using the perspective view shown in FIG. 2, and FIG. 1 is a perspective view of a core chip according to the present invention. A metal magnetic thin film 4 (for example, IF
A non-magnetic film 5 (slo, film, etc.) for defining the gap length is formed by sputtering or the like, and a non-magnetic film 5 (slo, film, etc.) for defining the gap length is formed on the first After integrating the core 1, the second core, and the core 3 with a high melting point glass 6 whose working temperature (temperature at which the viscosity becomes 104°C) is around 600°C, a track that is about 2μ wider than the desired track width is formed. Perform grooving leaving some width. Then, the track groove 7 is filled with low melting point glass 8 whose working temperature is around 450°C, and when it is processed into a chip, the core chip has the metal magnetic thin film 4 whose width is narrower than the ferrite track portion 90 shown in FIG. 10 is obtained.

Then, as shown in FIG. 2, this core chip 10 is
- A composite floating magnetic head can be obtained by embedding it in a slider 11 made of a non-magnetic material such as TiO3.

The above-mentioned processing conditions for track grooving are as follows: diamond particle diameter of the grooving wheel is 5μ or less, the tip angle is 90 degrees to 120 degrees, and the processing feed rate is 0.5.
Mh When done at a low speed of 7 seconds or less, it is 2μ lower than ferrite.
A metal magnetic thin film 4 having a narrow track width is obtained. As mentioned above, the actual track width is defined by the width of this metal magnetic thin film 4, so the width of the ferrite track portion 9 can be made wider than the desired track width. A track width smaller than the limit of 10 to 11 μm can be realized. Furthermore, for the same track width, the magnetic resistance of the core chip is smaller than when the track widths of the ferrite and metal magnetic thin films are the same, the recording and reproducing efficiency is high, and the processing yield is also high. Furthermore, since the metal magnetic thin film is short, the low melting point glass enters the gap interior 12, increasing the fixing strength of the gap portion. Table 1 shows the relationship between these effects and the difference in width between the ferrite and the metal magnetic thin film.

Table 1 Results of experimental confirmation As shown in Table 1, the difference in track width between ferrite and metal magnetic thin film is preferably 1 to 5 μmK.0 [Effects of the Invention] As described above, according to the present invention, ferrite By making the track width of the metal magnetic thin film smaller than the
This has the effect of providing a composite floating magnetic head with high recording and reproducing efficiency, high processing yield, and high strength in the gap area for high track density.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the core chip of a composite floating magnetic head of the present invention; FIG. 2 is a perspective view showing a composite floating magnetic head in which the core chip of FIG. 1 is embedded. FIG. 3 is a perspective view showing a core chip of a conventional composite floating magnetic head. 1...First core 2...Fill winding groove 3...Second core 4...Metal magnetic thin film 5... Non-magnetic film 6...High melting point glass 7...Track groove 8...Low melting point glass 9...7 Elite track portion 10...
・Core chip 11...Slider 12...Gap inside and above Applicant Seiko Epson Co., Ltd. Agent Patent attorney Tsutomu Mogami and 1 other famous sword 1 Zuko Z diagram

Claims (1)

[Claims] In a composite floating magnetic head in which a metal magnetic thin film with high saturation magnetic flux density is provided in the gap portion of a core chip made of ferrite, and the core chip is embedded in a slider made of a non-magnetic material, a track defined by the metal magnetic thin film is provided. A composite floating magnetic head characterized in that the width is smaller than the track width of the core chip made of the ferrite.