JPS6275954A - Magnetic head and magneto-optical reproducing head - Google Patents

Abstract

PURPOSE:To attain recording and reproducing by a same head by dislocating a magnetic path in a track transverse direction at the time of the recording and reproducing. CONSTITUTION:On a non-magnetic slider 1, magnetic paths 2 and 3 composed of a coil 4, 'Permalloy(R)', etc., are dislocated and formed in the track direction. At the time of writing, the electric current is supplied to a coil 4, recording is executed to a medium by a leaking magnetic flux from a gap 6, and at the time of reproduction, the light, in which the magnetizing rotation of a magnetic path 3 is linearly polarized by the magnetic field from the medium, is made incident upon a position 5, and the modulating light by the magnetizing rotation of the reflecting light or the transmitting light is detected. Thus, since the magnetic recording and the optical reproduction can be executed by the same head, a high S/N reproduction can be realized and the high recording surface density such as the high track density can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic head that magnetically writes to a magnetic storage medium and optically converts magnetic changes into electrical signals.

[Background of the invention]

As an example of prior art related to the present invention, Japanese Unexamined Patent Publication No. 47
There is a magneto-optical transducer described in No. 1-1244. The prior art □ describes a method of transferring the magnetic field from a magnetic storage medium to a magnetic film and reproducing it optically.
:, 1 No consideration is given to recording on magnetic storage media, that is, recording and reproducing using the same head.
1□ It was.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic/optical conversion reproducing head that can perform recording and reproducing using the same head.

[Summary of the invention]

In conventional magnetic heads, recording and reproduction are performed using the same coil, but with magnetic Q-light reproduction, the coil is not required during reproduction; Optical regeneration was rarely possible due to unevenness or the coil.

The present invention addresses this new problem by shifting the magnetic path during recording and reproduction in the track width direction, eliminating the influence of the coil during optical reproduction, and making it possible to easily configure the mounting of the optical system.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 (a
)(b) is an example in the case of a ring-type head. (
b) is a cross-sectional view of the AA portion in (a).

A coil 4 and a magnetic path 2.degree. 3 made of permalloy or the like are formed on a non-magnetic slider 1 by a thin film forming technique so as to be shifted in the track direction. At the time of writing, a current is passed through the coil, and the magnetic flux leaking from the gap 6 is used to record on the medium. During reproduction, light whose magnetization rotation in the magnetic path 3 is linearly polarized by the magnetic field from the medium is incident on 5, and reflected light or light modulated by the magnetization rotation of transmitted light is detected by a normal method. FIGS. 2(a) and 2(b) show an embodiment in the case of a single magnetic pole type head. (b) is a sectional view taken along the line A-A in (a). A single magnetic pole head for reading and a single magnetic pole for reading are separated and formed as thin films on a soft magnetic slider 11 made of ferrite or the like. During reproduction, linearly polarized light is incident on 15 as in FIG. Figure 3(a)(b)
) is an example of the optical regeneration method of the example of FIGS. 1 and 2. (b) is a sectional view of (a). In this case, a part of the slider 25' is made of a transparent material such as SjO*, and the end face 26 is made of aluminum or a dielectric total reflection film, which is fitted into the slider. The other end surface 27 is polished together with the slider 21 to form a thin film with the pattern shown in FIG. 1 or 2. During reproduction, linearly polarized light 27 passes through the magnetic film 23, is almost totally reflected at 26, and passes through the magnetic film 23 again.

This transmitted light is modulated according to the magnetization of the magnetic film 23, and the amount of this modulated light can be detected by a normal method. To explain using the configuration diagram in FIG. 4, polarized light from a laser 31 is guided through a half mirror 32 and a total reflection film 37 to a converter 37 (the embodiment shown in FIG. 3), and modulated light is transmitted through a total reflection film 37 to an analyzer 33. The detector 34 converts the signal into the Mi stream. Although not specified in the embodiment, the magnetic paths 3 and 13
It is possible to form a multilayer film in order to increase the magneto-optical conversion efficiency, but there is no limitation. Also, Example 1.2
The configuration is based on a format in which recording and playback are performed separately,
In the case of ductive write and (1) read, they offer advantages such as easy formation of thin films, and are not limited to optical reproduction, but are also effective as magnetic heads.

As described above, this embodiment has the advantage that recording and reproduction can be performed using the same head.

〔Effect of the invention〕

According to the present invention, since it is possible to create an integrated head for magnetic recording and optical reproduction, it can be used as a replacement for a recording/reproducing magnetic head in a conventional magnetic disk device, and is capable of high S/N reproduction.
This has the effect of increasing recording surface density such as high track density.

[Brief explanation of drawings]

FIG. 1 is an embodiment of a ring-type head of the present invention, FIG. 2 is an embodiment of a single-pole head of the present invention, FIG. 3 is an embodiment of the optical reproducing method of the present invention, and FIG. 4 is an embodiment of the present invention. FIG. 2 is a configuration diagram of a head according to the present invention.

Claims (1)

[Scope of Claims] 1. A magnetic head equipped with a magnetic circuit for recording and reproduction, characterized in that the magnetic path during recording and reproduction is shifted in the track width direction. 2. A magnetic/optical reproducing head characterized in that the magnetic path during recording and reproducing is shifted in the track width direction, and performs magneto-optical conversion during reproducing. 3. The magnetic optical reproducing head according to claim 2, characterized in that a part of the slider member is made of a transparent material so that total reflection occurs at the end face, and magneto-optical conversion is performed by the Faraday effect. Magnetic/optical reproducing head.