JPH01102708A - Perpendicular magnetic recording/playback head - Google Patents

Abstract

PURPOSE:To obtain a high magnetizing capacity and resolution simultaneously by performing the perpendicular magnetic recording of a magnetic recording medium by concentrating a magnetic flux emitted from a main magnetic pole on a gap consisting of a superconductive material on a head sliding plane, selecting the magnetic flux emitted from the magnetic recording medium by shielding an ambient magnetic field by the superconductive material on the head sliding plane, and performing the reproduction of a magnetic record. CONSTITUTION:The superconductive materials 4 and 5 which cover the sliding plane of the head and the magnetic pole 1 are bi-sected to two parts having no mutual contacts. In other words, it is possible to concentrate the path of an excited main magnetic pole at the gap of the superconductive material 5 on the head sliding plane at the time of recording by the Meissner effect of the superconductive material 5 which covers the head sliding plane and the main magnetic pole 1, and to magnetize the magnetic recording medium 7 being brought into contact with a head in the neighborhood of the gap strongly and sharply. Also, at the time of reproduction, it is possible to shield the ambient magnetic field by the Meissner effect of the superconductive material 5 on the head sliding plane similarly, and to pass only the magnetic flux of the recording medium being brought into contact with the head in the neighborhood of the gap to a main magnetic pole 1 side. In such a way, it is possible to narrow track width and to heighten a split capacity even by using the main magnetic pole with large magnetic saturation and high magnetizing capacity.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a perpendicular magnetic recording/reproducing head.

Conventional technology In recent years, perpendicular magnetic recording has properties that are inherently more suitable for high-density recording than the longitudinal recording methods currently in use, so research into perpendicular magnetic recording and playback heads has begun. , is being actively developed. There are two types of perpendicular magnetic recording/reproducing heads: an auxiliary pole excitation type that has high magnetization ability, and a main pole excitation type that allows access on one side and has relatively high resolution.

An example of a conventional auxiliary pole excitation type head for perpendicular magnetic recording and reproduction will be described below with reference to the drawings.

FIG. 4 shows an auxiliary magnetic pole excitation type single magnetic pole head. In Fig. 4, 1 is the main magnetic pole, 7 is the magnetic recording medium,
8 is the base of the recording medium 7, 9 is a horizontal permeable film with high magnetic permeability of the magnetic recording medium 7, 10 is a vertical oxide film of the recording medium 6, 12
indicates an auxiliary magnetic pole. Further, 11 indicates the flow of magnetic flux during recording. In this head, the main magnetic pole l placed on the surface of the recording medium 7 is magnetized by the excitation of the auxiliary magnetic pole 12 placed on the back side of the recording medium 7, and a strong perpendicular magnetic field is generated near the main magnetic pole 1. This is an opposing single magnetic pole head that magnetizes the recording medium 7. At this time, the horizontal permeable film 9 functions to concentrate the magnetic flux 11 generated by the auxiliary 1wAl2 near the main magnetic pole l. Further, during reproduction, the main magnetic pole 1 is magnetized by the magnetic field generated from the magnetization of the recording medium 7, and the magnetic flux change caused by the magnetization is transferred to the auxiliary magnetic pole 12.
A voltage is induced in the winding.

Problems to be Solved by the Invention However, in the perpendicular magnetic recording/reproducing head configured as described above, in order to achieve high-density recording, it is necessary to reduce the thickness and narrow the width of the main pole to increase the resolution of the head. However, this causes the problem that the main pole becomes more likely to be magnetically saturated and the magnetization ability of the main pole decreases.

On the other hand, the main pole excitation type head also has a relatively high resolution for the same reason, but has the problem of poor magnetization ability.

In view of the above-mentioned problems, the present invention provides a perpendicular magnetic recording/reproducing head that simultaneously has high magnetization ability and resolution due to a large and sharp magnetic field distribution.

Means for Solving the Problems In order to solve the above problems, the perpendicular magnetic recording/reproducing head of the present invention covers the head sliding surface and the side surface of the main pole constituting the head with a superconducting material. It has a structure in which a gap is attached to the head sliding surface to divide the superconducting material covering the head into two parts, and the magnetic flux emitted by the main pole is concentrated in the gap formed by the superconducting material on the head sliding surface. Perpendicular magnetic recording is performed on the magnetic recording medium, and the magnetic flux emitted by the magnetized magnetic recording medium is selected by shielding the peripheral magnetic field with the superconducting material on the head sliding surface to reproduce the magnetic recording.

Function The present invention concentrates the path of the excited main magnetic pole during recording to the gear knob made of the superconducting material on the head sliding surface by the Meissner effect of the superconducting material covering the head sliding surface and the main magnetic pole of the above configuration. The recording medium in contact with the head near the gap can be strongly and sharply magnetized. Furthermore, during reproduction, the peripheral magnetic field is shielded by the Meissner effect of the superconducting material on the sliding surface of the helad, and only the magnetic field of the recording medium in contact with the head near the gap passes through to the main pole side.

As a result of the above, even if a main pole with large magnetic saturation and high magnetization ability is used, the trunk width can be narrowed and the dividing power can be narrowed, and it is possible to obtain rad for perpendicular magnetic recording and reproduction that enables high-density recording and reproduction. be able to.

EXAMPLE Hereinafter, a perpendicular magnetic recording/reproducing head according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a perpendicular magnetic recording/reproducing head in one embodiment of the present invention. In Figure 1, ■ is a main magnetic pole with high magnetic permeability, 2 is a winding, 3 is a magnetic ferrite, 4 is two pairs of superconducting materials sandwiching the main magnetic pole 1, 5 is a head sliding surface and the main magnetic pole 1 superconducting material covering
Reference numeral 6 denotes a high permeability magnetic material that fills the gap between the superconducting material 5 on the head sliding surface. The head shown in FIG. 1 is a single-side magnetic pole head that does not require an auxiliary magnetic pole.

In the configuration shown in FIG. 1, the superconducting material 5 that covers the head sliding surface and the main magnetic pole 1 is divided into two parts without contact, so that the loop current that generates the demagnetizing field does not flow through the superconducting material 5. It looks like this. The operation of the perpendicular magnetic recording/reproducing head configured as shown in FIG. 1 during recording and reproducing will be described with reference to FIG. 2.

FIG. 2 shows a perpendicular magnetic recording/reproducing head, a 3N-structured magnetic recording medium advancing while in contact with the perpendicular magnetic recording/reproducing head, and the flow of magnetic flux. During recording, the main magnetic pole 1 is excited by a signal current flowing into the winding 2 and generates a magnetic flux 11. This magnetic flux 11
is concentrated on the magnetic material 6 of the gear knob on the head sliding surface due to the Meissner effect of the superconducting material 4 sandwiching the main pole 1 and the superconducting material 5 covering the head sliding surface, and the perpendicularly magnetized film 10 of the recording medium 7
is magnetized in the vertical direction and passes through the horizontal permeable film 9 with high magnetic permeability. At this time, the magnetic ferrite 3 serves as a return path for the magnetic flux emitted from the main pole l.

During reproduction, a magnetic flux change occurs in the main magnetic pole 1 due to the magnetic field of the recording medium 7 in contact with the gap between the head sliding surfaces, and a reproduction signal is induced in the winding 2.

In this example, by forming a magnetic material with high magnetic permeability in the gap of the superconducting material on the head sliding surface, the gap width can be made thinner regardless of the thickness of the main pole. can be made as thick as .

Note that in this embodiment, the side surface of the main pole 1 that is perpendicular to the running direction of the recording medium is not covered with a superconducting material, but it may be covered with a superconducting material so as not to form a loop around the main pole. It is possible. Such an embodiment is shown in FIG.

Effects of the Invention As described above, the present invention enables perpendicular magnetic recording and reproduction with high resolution by covering the side surface of the main pole of a single-pole head and the head sliding surface with a superconducting material. head can be realized. Using this, ultra-high density magnetic recording can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a perpendicular magnetic recording head according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a perpendicular magnetic recording head according to an embodiment of the present invention.
Main pole, 2...Winding, 3...Magnetic ferrite, 4.5...Superconducting material, 6...
High permeability magnetic material, 7...Magnetic recording medium, 8.
...Base, 9...Horizontal permeable film, 10.
... Perpendicular magnetization film, 11 ... Magnetic flux, 12.
...Auxiliary magnetic scratching. Name of agent: Patent attorney Toshio Nakao and 1 other person

Claims (1)

[Claims] A single magnetic pole head for perpendicular magnetic recording and reproduction, in which the head sliding surface and the side surface of the main pole constituting the head are covered with a superconducting material, and the superconducting material covering the head sliding surface is divided into two parts. It has a structure in which a gap is attached to the head sliding surface, and performs perpendicular magnetic recording of the magnetic recording medium by concentrating the magnetic flux emitted by the main pole in the gap formed by the superconducting material on the head sliding surface. A perpendicular magnetic recording/reproducing head characterized in that a superconducting material on a head sliding surface shields a peripheral magnetic field and selects the magnetic flux emitted by a magnetized magnetic recording medium to reproduce magnetic recording.