JPS62154315A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve a high-frequency characteristic by using a thin soft amorphous magnetic metallic film having the excellent high-frequency characteristic. CONSTITUTION:A Co-Zr-Nb film 2 is formed to the thickness corresponding to the track width of a magnetic head on a nonmagnetic substrate 1 such as glass, ceramics. A protective film 3 consisting of SiO2 or Al2O3 is formed on the film 2. Low melting glass is further coated on the film 3 and a nonmagnetic substrate 1' is mounted thereon. The magnetic core having the construction in which such Co-Zr-Nb film 2 is sandwiched by the nonmagnetic substrates 1, 1' is cut to form a groove 8 for coil winding and to set a gap depth to a prescribed value. Tapered flat parts 9 are then worked and a head slider 12 is manufactured. The good high-frequency characteristic is obtd. by using the thin soft amorphous magnetic metallic film having large specific resistance. There is no need for adopting a lamination construction in the case of specifying the track width to about 20mum and the process for manufacture is simplified. Since the excellent magnetic characteristics are maintained even with the thin film of <=3mum, this magnetic head is satisfactorily applicable to the smaller track widths.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a magnetic head suitable for floating high-density magnetic recording for hard disks.

<Prior Art> In recent years, there has been a remarkable increase in recording density in the field of magnetic recording, and as a result, magnetic heads as electromagnetic transducers are being developed with narrower gaps and narrower tracks. In addition, in order to provide a sufficient double magnetic field to a recording medium constructed using a high coercive force material, the head core material has a high saturation magnetic flux density, and as the recording frequency increases, the reproduction sensitivity in the high frequency range improves. Materials with excellent magnetic permeability and high-frequency properties are being considered for this purpose.

Regarding floating heads for hard disks, research is being conducted on low-flying sliders and thin-film head technology in response to higher density. In floating heads for hard disks, the head is constructed near the rear end of the slider in order to make it float. Conventionally, the heads have been constructed depending on the method of construction: ■monolithic type, ■composite type in which a ferrite core is mounted on a non-magnetic slider, ■There are thin film types, etc. but,
These magnetic heads have the following problems when dealing with higher density. In the case of a monolithic head, when the track is narrowed, the thickness of the head access portion is reduced, resulting in a reduction in the mechanical strength of the aforementioned portion. Therefore, the durability during access decreases,
Head crashes are more likely to occur, which poses a problem for C8S and long-term stable access. Although the problems of the monolithic type described above have been improved for composite type heads, since ferrite is used as the core material,
The frequency characteristics of saturation magnetic flux density and magnetic permeability are not sufficient in terms of improving recording density.

Thin-film heads are superior to the above two types of heads in terms of the strength of the head access part and the properties of the core material, but the problem is that they are difficult to manufacture because they require many processing processes. has.

Furthermore, in order to manufacture a head with a track width of 10 μm or less, it is difficult to exhibit sufficient characteristics due to restrictions caused by the core shape. In view of these points, the present inventors have devised a magnetic head in which soft magnetic metal thin films are butted together with a non-magnetic spacer interposed therebetween. However, although this type with soft magnetic thin films has the characteristics of a narrow track of 10 μm or less and an easy processing process,
As a soft magnetic thin film, its high frequency properties were still insufficient.

<Object of the Invention> The present invention has been made to solve the above problems, and provides a magnetic head with improved high frequency characteristics by using an amorphous soft magnetic metal thin film with excellent high frequency characteristics. purpose.

<Embodiment> FIG. 1 is a perspective view of a floating type high-density magnetic recording head according to an embodiment of the present invention. It has a structure in which a magnetic core with a thickness equivalent to the track width is sandwiched between the center rail.

2 to 6 show the manufacturing process of the floating type high-density magnetic thickening head.

In FIG. 2, Co-Zr-
The Nb film 2 is formed to a thickness corresponding to the track width of the magnetic head. On this Co-Zr-Nb film, a protective film 3 of 5i02 or Al2O3 is applied for the purpose of preventing oxidation, etc., improving wear resistance, and improving adhesive strength during thermal fusion through interdiffusion with low melting point glass, which will be described later. form. Furthermore, the protective film 3 is coated with low melting point glass (or resin, solder), and the non-magnetic substrate II is mounted on it as shown in FIG.
Next, as shown in Figure 4, the magnetic board for both valves! , 1' are pressed and supported from the outside by pressure (P) from the outside in the pressing jig 6. The low melting point glass may be in the form of a sheet or a thin film. Further, in order to improve the adhesive strength of the low-melting point glass, it is preferable to form a non-magnetic metal thin film on the protective film 3 and on the inner surface of the non-magnetic substrate 1'.

Through the above steps, a magnetic core having a structure in which the Co--Zr--Nb film 2 is sandwiched between the nonmagnetic substrates I and 1' can be manufactured.

Next, this core is cut along the plane surrounded by ABCD in Fig. 5, and a groove 8 for coil winding is made on one side of the cut surface ABCD, and the surface is precision polished, and the Use it as a core member. Next, a magnetic head block is formed using a gap method via a magnetic gap spacer (a non-magnetic film such as a Si02°Al2O3 film) as shown in FIG.

Further, the block thus formed is processed into the shape of a flying head slider by, for example, the following steps.

First, the medium facing surface (the upper surface in FIG. 6) is mirror-finished. At this time, the gap depth d is set to a predetermined value. Next, the tapered flat portion (number 9 in FIG. 1) is processed, and the rail (number +0 in FIG. 1) is further processed to obtain a predetermined flying height. Thereafter, one side of the core (the part cut in FIG. 5) is sliced and partially removed, and then winding is applied. Finally, by attaching this head slider 2 to the suspension 11 as shown in FIG. 7, a flying magnetic head is manufactured. 1 in the same figure
3 is a gimbal leaf spring.

In the above embodiment, the slider is a tapered flat type positive pressure slider, but other positive pressure type or negative pressure type sliders can also be applied.

<Effects of the Invention> In the present invention, since an amorphous soft magnetic metal thin film with a large specific resistance is used, it has less eddy current loss and excellent high frequency characteristics than Sendust etc., and when the track width is about 20 μm, There is no need for a laminate structure, and the core manufacturing process can be simplified. Furthermore, since excellent magnetic properties can be maintained even with a thin film of 3 μm or less, it is sufficient to support ultra-narrow tracks.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a slider showing one embodiment of the magnetic head according to the present invention, FIGS. 2 to 6 are perspective views showing the manufacturing process thereof, and FIG. 7 is a perspective view of a floating magnetic head. . In the figure, 1.1': Non-magnetic substrate 2: Soft magnetic metal thin film 3: Protective film 6: Pressure member 8: Groove 9: Tapered flat part 10
: Rail 11: Suspension 12: Head slider - I3 Nishinpal leaf spring Agent Patent attorney Aihiko Fukushi (and 2 others) Fig. 2 Fig. 3 Fig. 6 Fig. 7

Claims (1)

[Claims] 1. A magnetic head having a structure in which a soft magnetic metal thin film is sandwiched between nonmagnetic substrates, characterized in that an amorphous soft magnetic metal thin film is used as the soft magnetic metal thin film.