JPS5853016A - Vertical magnetic recording and reproducing head - Google Patents

Abstract

PURPOSE:To improve the magnetic energy efficiency and the S/N and to make the winding work of a coil easy, by winding the coil around the assembly of a main magnetic pole and an auxiliary magnetic pole, providing an auxiliary yoke for one side only and arranging the assembly vertically on the magnetic recording medium. CONSTITUTION:On a magnetic recording medium A, a magnetic shaft 1 of a fine strip made of high permeability magnetic substance is surrounded with a soft protecting member 2 so that the tip of a main magnetic pole 3 can be brought into contact with the surface of a magnetic substance layer 6 and both of them are perpendicular to each other. An auxiliary magnetic pole 5 is formed to be surrounded via a minute gap from the main magnetic pole 3 and a coil 4 is wound arround the magnetic pole 5. One side of a yoke auxiliary magnetic pole 8' has a large area of the opposing part S so that a closed magnetic path is formed from the main magnetic pole to the recording medium and the magnetic pole 8' is provided via a minute air gap from the surface of the recording medium, allowing to improve the magnetic energy efficiency and the S/N and to make the coil winding work easy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in perpendicular magnetic recording and reproduction.

A magnetic recording method using a ring-shaped magnet currently used in tape recorders and the like uses a magnetization vector in the longitudinal direction of the recording medium to perform recording and reproduction. As the density of recorded information is increased and the bit spacing is narrowed by the magnetic recording method using this ring-shaped magnetic head, not only does the strength of magnetization decrease due to the demagnetization effect within the magnetic recording medium, but also Rotation of the magnetization vector occurs within the cross section of the magnetic recording medium, significantly reducing the reproduction output of recorded information. Therefore,
In order to enable high-density magnetic recording, a perpendicular magnetic recording method in which the demagnetization effect is close to zero is required.

This perpendicular magnetic recording method includes the method of Professor Iwasaki of Tohoku University. FIG. 1 shows a conventional perpendicular magnetic recording/reproducing head for perpendicular magnetic recording and reproduction of information on a magnetic recording medium used in Professor Iwasaki's method. A main magnetic pole 6 whose periphery is covered with a protective material 2 such as a plastic material, and a high magnetic permeability 78 that faces the main magnetic pole 3 with the magnetic recording medium A interposed therebetween.
An auxiliary magnetic pole 5 is provided with a coil 4 wound around a light material.

In conventional perpendicular magnetic recording, (1) the main magnetic pole 6 and the auxiliary magnetic pole 5 are arranged separately on both sides of the magnetic recording medium A, making it difficult to align the main magnetic pole 3 and the auxiliary magnetic pole 5; Not only is it unsuitable for disk heads or multi-drives. Ta.

In addition, (2) the magnetic circuit formed by the main magnetic pole 3 and the auxiliary magnetic pole 5 becomes an open magnetic path, so the lines of magnetic force spread widely in space, reluctance (magnetic resistance) increases, and energy efficiency deteriorates. Therefore, it is necessary to flow a large current through the coil 4 of the auxiliary magnetic pole 5 during recording, and the magnitude of the output during reproduction depends on the strength of the magnetization vector, which is the signal source of the magnetic recording medium, and the magnetic circuit Since it is inversely proportional to the roughtance, there were drawbacks such as extremely poor reproduction S/N ratio.Therefore, the present inventors proposed a method for perpendicular magnetic recording and reproduction that eliminates the aforementioned drawbacks. FIG. 2 is a diagram showing the configuration of the perpendicular magnetic recording/reproducing head, and shows the configuration of the magnetic recording medium A.
is made of a material that exhibits strong uniaxial anisotropy in the direction perpendicular to the film surface of the magnetic layer 6. ing. The material of this magnetic layer 6 is 0
r-Co, Gd-Co.

Examples include Gd-Fe, Tb-Fe, and Dy-Fe RF films, and MnB1 vapor-deposited films. pace layer 7
A thin film of a high permeability magnetic material, such as permalloy or Mn-Zn ferrite, is formed on a substrate made of glass, ceramic, plasti, resin, etc. by a coating method, a tarring method, etc., or a permalloy plate + Mn-Zn. Use only a high permeability plate such as a two-light plate. The main magnetic pole 6 has its tip in contact with the surface of the magnetic layer 6 of the magnetic recording medium A, and has a magnetic axis 1 of a thin strip made of a magnetic material with high magnetic permeability perpendicular to the surface. A shaft 1 is surrounded by a soft protective material 2. The reason why soft plastic, glue, etc. is used as the material for the protective material 2 is that the tip of the strip 1 is in contact with the magnetic layer and wears out, but at this time, it is necessary to sharpen the pencil to expose the lead. protective material 2
This is so that it can be removed.

The magnetic shaft 1 is made of, for example, permalloy, Mn-Zn ferrite, etc., and its size is set to be approximately several μm in width and 1 μm or less in thickness.

The auxiliary magnetic pole 5 is provided surrounding the main magnetic pole 3 with a small gap separated from the main magnetic pole 6. That is, the main magnetic pole 3 is movable within the auxiliary magnetic pole 5.

A coil 4 is wound around the auxiliary magnetic pole 5, and the magnetic field is determined by the current flowing through the coil 4 and the number of turns of the coil 4. The yoke auxiliary magnetic pole 8 has magnetic lines of force extending from the auxiliary magnetic pole 5 to the magnetic axis 1 of the main magnetic pole 3. Magnetic layer of magnetic recording medium A6. pace layer 7
and the yoke auxiliary magnetic pole 8 to form a closed magnetic path.

The yoke auxiliary magnetic pole 8 is made of a high permeability magnetic material with good frequency characteristics, such as ferrite. The structure is such that a minute gap is created between the yoke auxiliary magnetic pole 8 and the magnetic layer of the magnetic recording medium A during recording and reproduction. This is because when reproducing information, there is a possibility that the output due to magnetic flux detection from the yoke auxiliary magnetic pole 8 will be output from the coil 4, so the magnetic flux of the information must be detected from the main magnetic pole 6. It is. In addition, in order to reliably read information from the magnetic recording medium A, a closed magnetic path is configured in the main magnetic pole 6 so that the detected magnetic flux does not leak to the outside, and in order to reduce reluctance (magnetic resistance), the magnetic recording medium is This is done by increasing the facing area S of the opposing yoke auxiliary magnetic poles 8.

When recording information explaining the operation of the 17-dot in this perpendicular magnetic recording/reproduction, it is recorded in the coil 4 wound around the auxiliary magnetic pole 5, and a current I corresponding to the desired information flows, thereby causing the main magnetic pole 6 to The magnetic flux concentrates at the tip of the magnetic axis 1 of the thin magnetic strip, causing the magnetic strip to form.

Information is recorded by causing magnetization reversal only in the portion of the magnetic layer 6 of the magnetic recording medium A that is in contact with the tip of the magnetic axis 1 of the magnetic recording medium A.

When reproducing recorded information, a magnetic flux is detected at the tip of the magnetic axis 1 of the thin magnetic strip of the main pole 3 according to the magnetization of the magnetic layer 6 of the magnetic recording medium A, and a coil 4 is detected by the magnetoelectric conversion action. Read out information using the current flowing through it as output 1.
Reproduce.

However, although this proposed perpendicular magnetic recording/reproducing device had good performance, it was extremely difficult to manufacture it because the coil had to be wound around the center of the white letter. .

The present invention has been made to solve the above problem, and its characteristics include a main magnetic pole arranged perpendicularly to the surface of the magnetic layer of a magnetic recording medium, and a micro-gear separating the main magnetic pole. an auxiliary magnetic pole surrounding the auxiliary magnetic pole; a yoke auxiliary magnetic pole provided on one side of the auxiliary magnetic pole to form a closed magnetic path to the magnetic recording medium and separated from the surface of the magnetic recording medium by a microgap; The present invention includes a coil wound around the auxiliary magnetic pole.

Hereinafter, the present invention will be described in detail along with examples.

FIG. 3 is a diagram showing the configuration of an embodiment of the present invention, and the same parts as in FIG. 2 are given the same symbols.

In this embodiment, as shown in FIG. 3, the yoke auxiliary magnetic pole 8 shown in FIG. Magnetic layer 6 of magnetic recording medium A
．． An auxiliary magnetic pole 8' is provided so as to form one closed magnetic path passing through the space layer 7 and the yoke auxiliary magnetic pole.

In this way, since the yoke auxiliary magnetic pole 8' is provided only on one side of the auxiliary magnetic pole 5, the work of winding the coil 4 around the auxiliary magnetic pole 5 becomes extremely easy.

The first recording/reproducing operation of this embodiment is basically the second one described above.
Since the operation is the same as that shown in the figure, it will be omitted here.

As explained above, according to the present invention, a main magnetic pole and an auxiliary magnetic pole are combined to provide a perpendicular magnetic recording/reproducing field on one side of a magnetic recording medium, and the main magnetic pole and auxiliary magnetic pole have a special structure. Since a closed magnetic path is formed from the magnetic pole to the perpendicular magnetic recording medium, it is possible to improve the efficiency of magnetic energy during recording and reproducing information, and to improve the S/N ratio during reproduction. Further, since the yoke auxiliary magnetic pole is provided only on one side of the auxiliary magnetic pole, the work of winding the coil around the auxiliary magnetic pole can be made extremely easy.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a conventional perpendicular magnetic recording/reproduction head, FIG. 2 is a diagram showing the configuration of a perpendicular magnetic recording head proposed by the inventors of the present invention, and FIG. FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.・ 1 Magnetic axis 2 Protective material 3...Main magnetic pole-4 Coil 5 Auxiliary magnetic pole 6・Magnetic layer 7 Pace layer 8, 8' Yoke auxiliary magnetic pole S
Area of the surface of the yoke auxiliary magnetic pole facing the surface of the magnetic layer of the magnetic recording medium Agent Patent attorney Aki 1) Shu Ki

Claims (1)

[Claims] A main magnetic pole whose magnetic axis tip is in contact with the surface of the magnetic layer of the magnetic recording medium and is arranged perpendicular to the surface, and an auxiliary magnetic pole which is provided to surround the main magnetic pole with a small gap in between. , a yoke auxiliary magnetic pole provided on one side of the auxiliary magnetic pole so as to form a closed magnetic path to the magnetic recording medium and separated from the surface of the magnetic recording medium by a minute gap, and a coil wound around the auxiliary magnetic pole. A perpendicular magnetic recording/reproducing head comprising: