JPS61242310A - Vertical magnetic head - Google Patents

Abstract

PURPOSE:To obtain the title vertical magnetic head having excellent recording and reproduction effiency and without any strains of the reproduced waveform by arranging the side to be opposed to an auxiliary magnetic pole on the surface of a main magnetic pole to be opposed to a track part and the side to be opposed to the main pole on the surface of the main pole to be opposed to the track part not in parallel with each other. CONSTITUTION:A main magnetic pole 4 is formed with a metallic thin film consisting of 'Permalloy(R)', an amorphous magnetic alloy, etc., and having high saturation magnetic flux density and high permeability. The surface 4a, namely the leading end surface 4a, of the main pole 4 is opposed to the track part 8 of a recording medium 1 and recording and reproduction are carried out. The main pole 4 consisting of the metallic thin film is joined to an inverted L-shaped auxiliary magnetic pole 5 of ferrite, etc., at the upper part. Besides, the surface 5a of the auxiliary pole to be opposed to the track part 8 has a larger area than that of the leading end surface 4a of the main pole. The edge part 4b on the leading end surface 4a of the main pole which is the side to be opposed to the auxiliary pole 5 and the edge part 5b on the surface 5a of the auxiliary pole which is the side to be opposed to the main pole 4 are arranged not in parallel with each other.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to 1, for example, floppy disks, etc.
This invention relates to a perpendicular magnetic head using a perpendicular magnetic recording method.

[Conventional technology]

As a perpendicular magnetic head using perpendicular magnetic recording method.

It was described in Japanese Patent Application Laid-Open No. 134706/1983. main,
A system in which the magnetic pole and the auxiliary magnetic pole faced each other with a recording medium interposed was proposed, but this created an open magnetic path in which the magnetic flux contributing to recording and reproduction spread through space, resulting in poor efficiency.

In order to improve this problem, a magnetic head has been proposed in which the magnetic flux flows in a closed magnetic path.

Next, the operation will be explained. As shown in FIG. 3 (1), when the auxiliary magnetic pole (5) is excited by the coil (6), the a-path (71) is the main magnetic pole (41, the auxiliary magnetic pole (5), and the permalloy layer (3). ), it efficiently drives the tip surface (4a) of the main pole to the saturation magnetization level and generates a strong magnetic field.This magnetic field causes the recording medium (1
) where the magnetic flux is incident in the thickness direction of the recording medium (1) traveling in the direction of the arrow (B).
8), information as shown by arrow (A) can be recorded.

During reproduction, the magnetic layer (
2) can be efficiently induced in the coil (6).

[The problem that the invention is trying to solve]

In a conventional perpendicular magnetic head constituting a closed magnetic path, an edge portion (4b) on the tip surface (4a) of the king magnetic pole and an edge portion (5b) on the opposing surface (5a) of the auxiliary magnetic pole are configured to be parallel to each other. Recording medium (1) when recording and playing back information
The two cars run in parallel on the same track section (8). Since the magnetic resistance of the closed magnetic path is the smallest at the edge part (5b) of the auxiliary magnetic pole, during reproduction, at the same time as the main magnetic pole (41), the edge part (5b) of the auxiliary magnetic pole records data in the track part (8). There was a problem that information was picked up and the reproduced waveform was distorted.

This invention was made to solve the above problems.
It has the high efficiency of a closed magnetic circuit.

Another object of the present invention is to obtain a perpendicular magnetic head that can reduce distortion of a reproduced waveform caused by an auxiliary magnetic pole when reproducing information.

[Means for solving problems]

The perpendicular magnetic head according to the present invention has a main magnetic pole.

It has an auxiliary magnetic pole that provides a magnetic path for the magnetic flux of the main magnetic pole, and records information by injecting magnetic flux into the track portion of the magnetic layer of the recording medium in the thickness direction of the recording medium, and reproduces information from the recording. The magnetic head is configured such that the side facing the auxiliary magnetic pole on the surface of the main pole facing the track portion and the side facing the main magnetic pole on the surface of the auxiliary pole facing the track portion are non-parallel. This is what I did.

[Effect]

In this invention, the side of the auxiliary magnetic pole facing the main magnetic pole on the surface facing the track portion is configured to be non-parallel to the information recorded on the track portion and has an azimuth angle. Since the rate at which information is picked up during playback is reduced, the distortion of the playback waveform is reduced. Furthermore, as the recorded information becomes a 1% density signal, the rate at which information is picked up becomes smaller, resulting in lower distortion of the reproduced waveform.

[Embodiments of the invention]

An embodiment of the present invention will be explained below. 1st
In Figure (a), (1) to (3) are exactly the same as the conventional device, and (4) is a metal with high saturation magnetic flux of 1,000 degrees and high magnetic permeability, such as permalloy or amorphous a-type alloy. The main magnetic pole is formed of a thin film, and its opposite surface (
4a) That is, the leading end surface (4a) faces the track portion (8) of the recording medium (1) and performs recording and reproducing functions. The main magnetic pole (4) i; t is made of this magnetic thin film, and the auxiliary magnetic pole (5) is made of a high permeability material such as ferrite, which has an inverted shape, for example.
are joined at the top. In addition, the track part of the auxiliary magnetic pole (8
) has a larger area than the tip surface (4a) of the main pole, and also has a larger area than the tip surface (4a) of the main pole.
The edge m(
41)) and the edge portion (5b), which is the side facing the main magnetic pole (4) on the opposing surface (5a) of the auxiliary af pole, are arranged so as to be non-parallel to each other. 16) is a coil, and the dotted line (7> is a magnetic path representing the path of magnetic flux. In the figure, θ is the edge part (4 m) of the main magnetic pole (41) and the auxiliary magnetic pole (5).
)), (51)) and is called the azimuth angle. The best effect is when this θ is 90', but an example is 45°.
It should be carried out in about 20 minutes.

FIG. 1(1)) is a side view of the magnetic head according to this embodiment.

As shown in FIG. 1 (1), the magnetic path (71) during recording and re-LE forms a closed magnetic path passing through the main magnetic pole (41, auxiliary magnetic pole (5), and permalloy layer (3), so W43 Figure (a
), (b) It is a highly efficient head, similar to the conventional perpendicular magnetic head shown in (b).

As shown in No. 111(a), the edge portion (5
b) and the information recorded on the track section (8) by the main magnetic pole (41) are nonparallel and have an azimuth angle θ, so during reproduction, the information picked up from the auxiliary magnetic pole (41) becomes smaller due to the azimuth effect, and the information is further increased. The information picked up from the #1 auxiliary magnetic pole (41) for density recording is smaller compared to the conventional method.Therefore, the distortion of the reproduced waveform is reduced.

FIG. 4 shows another embodiment of the present invention, in which an auxiliary magnetic pole (5) is provided before and after the main magnetic pole (410), and the edge B (S (51)) of which auxiliary magnetic pole (5) This embodiment is constructed so that the information recorded on the track section (8) has an azimuth angle θ.This embodiment achieves the same effect as the above embodiment, and further improves the recording/reproducing efficiency. It is something.

〔Effect of the invention〕

As described above, according to the present invention, the main magnetic pole.

It has an auxiliary a pole that provides a magnetic path for the magnetic flux of this main pole.

In a perpendicular magnetic head that records information by injecting magnetic flux in the thickness direction of the recording medium into the track portion of the magnetic layer of the recording medium and performs reproduction from the recording, an auxiliary magnetic pole on the surface opposite to the track portion of the main magnetic pole. Since the side facing the auxiliary magnetic pole and the side facing the main pole on the surface facing the track portion of the auxiliary magnetic pole are non-parallel, the vertical magnetic head has high recording/reproducing efficiency and less distortion of the reproduced waveform. is obtained n,
This effect is particularly great when the recorded information is of high density.

[Brief explanation of drawings]

FIG. 1(a) is a perspective view showing a vertical sea air head according to an embodiment of the present invention, and FIG. 1(b) is a side view thereof. FIG. 2 shows another embodiment of the present invention, and is a perspective view of a perpendicular magnetic head in which auxiliary magnetic poles are provided before and after a main magnetic pole. FIG. 3(a) is a perspective view showing a conventional perpendicular magnetic head having a closed magnetic path, and FIG. 3(1) is a side view thereof. In the figure, (1) is the recording medium, (41 is the main magnetic pole, (
4a) is the surface facing the track portion of the main pole, (41))
The side of the Fi main magnetic pole facing the auxiliary magnetic pole, (5) is the auxiliary magnetic pole, (5a) is the surface facing the track part of the auxiliary magnetic pole, (
sb) is the side of the auxiliary magnetic pole facing the main magnetic pole, and (8) is the track portion. Note that in the two figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] It has a main magnetic pole and an auxiliary magnetic pole that provides a magnetic path for the magnetic flux of the main magnetic pole, and records information by injecting magnetic flux into the track portion of the magnetic layer of the recording medium in the thickness direction of the recording medium, and from the recorded information. In a perpendicular magnetic head that performs reproduction, a side opposite to the auxiliary magnetic pole on a surface of the main pole facing the track portion, and a side facing the main magnetic pole on a surface of the auxiliary magnetic pole facing the track portion. A perpendicular magnetic head characterized in that it is configured to be non-parallel.