JPH01276408A - Magnetic head for perpendicular magnetic recording - Google Patents

Abstract

PURPOSE:To lower magnetic resistance between a first ferrite core and a soft magnetic thin film and to improve recording and reproducing efficiency by fitting a second ferrite core to the part of a slider to face to a nonmagnetic slider, to which a main magnetic pole is fit. CONSTITUTION:On a ferrite core 1, to which a channel for exciting coil 6 is formed on an upper surface, a nonmagnetic slider 4a, for which a soft magnetic thin film 3 for main magnetic pole, and another nonmagnetic slider 4b are adhered with the soft magnetic thin film 3 for main magnetic pole between. Then, a PHI type magnetic head for perpendicular magnetic recording is formed. A second ferrite core 2 is integrated into the part of the slider 4b, which faces to the slider 4a with the thin film 3 between, being adhered to the core 1 and thin film 3. Thus, a magnetic line 7 by a coil 6 is not immediately concentrated to the thin film 3 and the increase of the magnetic resistance can be evaded since respective contact surfaces are flat. Then, the degradation of the thin film 3 can be evaded and the recording and reproducing efficiency can be improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic head for perpendicular magnetic recording.

[Contents and problems of conventional technology]

Conventionally, two types of magnetic heads for perpendicular magnetic recording have been mainly used as shown in FIGS. 3 and 4.

FIG. 3 shows what is called a "φ type head", in which a soft magnetic thin film 3 for the main pole is formed on one non-magnetic slider 4a.
After adhering the other non-magnetic slider 4b, it is formed by adhering it to the ferrite core 1 around which the excitation coil 6 is wound, so that the recording medium slides on the surface of the non-magnetic slider.

On the other hand, Fig. 4 shows a so-called "r wsp type head" in which a non-magnetic slider 4a and a ferrite core 1a are bonded in advance, a soft magnetic thin film 3 serving as a main pole film is formed, and an opposing ferrite core 1b and slider are bonded together. 4b and the excitation coil 6 is wound after adhesion to form a wsP type head.

These magnetic heads for perpendicular magnetic recording operate by sending a recording signal through the excitation coil 6 to generate ferrite cores la,
The magnetic lines of force 7 flow in the direction lb, and after concentrating on the soft magnetic thin film 3, the perpendicular magnetic recording medium is magnetized and recorded.

On the other hand, when the recorded perpendicular magnetic recording medium passes over the magnetic head for perpendicular magnetic recording, the change in magnetic flux of the recording signal magnetized on the perpendicular magnetic recording medium is read, and the exact opposite of that during recording occurs, causing the coil to A continuous signal is played.

In this recording and reproducing process, the most important thing is to minimize the magnetic resistance in the magnetic circuit formed by the magnetic head and magnetic recording medium, thereby improving the recording and reproducing efficiency. .

However, the above-described structure of the magnetic head has a large magnetic resistance due to the magnetic circuit, and is insufficient in terms of recording and reproduction.

That is, in the "φ-type head", as shown in part A of FIG. 3, due to its structure, a space 10 is likely to be formed between the ferrite core 1 and the soft magnetic thin film 3, which increases the magnetic resistance. , which lowered the recording and reproducing efficiency.

On the other hand, as shown in part B of FIG. 4 for the "rwsp type head", it is difficult to flatten and mirror-polish the non-magnetic sliders 4a, 4b, ferrite cores la, lb, and adhesive layer 8, and the non-magnetic This deteriorates the magnetic properties of the soft magnetic thin film 3 that forms the main magnetic pole formed on the slider 4a and the ferrite core 1a, leading to a decrease in recording and reproducing efficiency.

[Purpose of the invention]

The present invention solves these problems by attaching a second ferrite core to the part of the non-magnetic slider that faces the non-magnetic slider to which the main magnetic pole is attached, thereby increasing the strength between the first ferrite core and the soft magnetic thin film. It is an object of the present invention to increase the contact area of a magnetic material magnetic circuit, reduce the magnetic resistance between the first ferrite core and the soft magnetic thin film, and improve recording and reproducing efficiency.

[Structure of the invention]

The present invention comprises a ferrite core 1 having a groove for an excitation coil 6 formed on its upper surface, a non-magnetic slider 4 on which a soft magnetic thin film 3 for a main magnetic pole is formed, and a non-magnetic slider 4 with a soft magnetic thin film 3 for a main magnetic pole sandwiched therebetween. In a φ-type magnetic head for perpendicular magnetic recording on which a non-magnetic slider 5 is adhesively formed, the non-magnetic slider 5 faces the non-magnetic slider 4 on which a soft magnetic thin film for the main pole is formed.
The ferrite core l and the soft magnetic thin film 3 for the main pole are placed in the
1. A magnetic head for perpendicular magnetic recording, characterized in that it has a structure incorporating a second ferrite core 2 in close contact with the ferrite core 2.

[Explanation based on examples]

Examples will be described in detail below.

FIG. 1 shows an embodiment of the present invention.

A non-magnetic slider 4a in which a soft magnetic thin film 3 serving as a main magnetic pole is formed on a ferrite core l having a coil groove attached thereto.
A slider 4b in which a ferrite block 2 which is surface-connected to the ferrite core 1 and the soft magnetic thin film 3 of the main pole is embedded in the non-magnetic slider 4b facing this is the first slider 4b.
The structure is glued as shown in the figure. As a result, the magnetic lines of force 7 generated by the excitation coil 6 do not immediately concentrate on the soft magnetic thin film 3 as shown in FIG. 3, but pass through the ferrite block 2 and reach the soft magnetic thin film 3. At this time, ferrite core 1 and ferrite block 2. Since the ferrite block 2 and the soft magnetic thin film 3 are in plane contact, the value of magnetic resistance is reduced and an increase in magnetic resistance due to concentration of magnetic lines of force can be avoided. Furthermore, since the soft magnetic thin film 3 is formed on a single slider material, deterioration of magnetic properties can be avoided.

FIG. 2 shows the recording current characteristics of the "φ type", "r wsp type" and the embodiment of the present invention using the same medium. That is, in the magnetic head according to the present invention, the output reproduction characteristic has a value more than twice the permeability force applied to the excitation coil during recording.

It can be seen that the embodiment of the present invention reaches saturation quickly and has a large reproduction output, so that the efficiency in recording and reproduction is improved.

〔Effect of the invention〕

As described above, according to the present invention, a magnetic head for perpendicular magnetic recording with high recording and reproducing efficiency was obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of a "modified φ-type magnetic head" for perpendicular magnetic recording according to the present invention, in which (a) is a longitudinal cross-sectional view, and (b) is an enlarged view of part 0 of (a). FIG. 2 is a characteristic diagram showing supermagnetic force during recording and reproduction output of a magnetic head for perpendicular magnetic recording, and P is a characteristic of the magnetic head according to the present invention. Q is the characteristic of the conventional WSP type magnetic head. R is the characteristic of a conventional φ-type magnetic head. FIG. 3 is a diagram showing the structure of a conventional φ-type magnetic head. (a) is a longitudinal sectional view, and (b) is an enlarged view of part A in (a). FIG. 4 is a diagram showing the structure of a conventional WSP type magnetic head. (a) is a longitudinal sectional view, and (b) is an enlarged view of part B in (a). 1, la, lb...ferrite core. 2...Second ferrite core. 3... Soft magnetic thin film. 4a, 4b...Nonmagnetic slider. 6... Excitation coil. 7... Lines of magnetic force. 8...Adhesive layer. 10...Space. Patent applicant: Tohoku Metal Industry Co., Ltd. Figure 7 C sound p Book Figure 3 (a) Figure 4 (b) Front B

Claims (1)

[Claims] A non-magnetic slider with a main magnetic pole formed perpendicular to the sliding surface,
A first ferrite core having an excitation coil groove formed therein is adhered to the back surface, and a second ferrite core is incorporated into the slider so as to be in close contact with one side of the main pole film and the first ferrite core, respectively. A magnetic head for perpendicular magnetic recording, characterized by having a structure.