JPS62298906A - Magnetic recording and reproducing head - Google Patents

Abstract

PURPOSE:To reduce the peak shift or the like of a reproduced signal and to perform recording and reproducing at a good error rate by sticking a high-permeability magnetic thin film to the trailing edge side of a high-permeability magnetic member so that the end face facing a magnetic recording medium of this thin film is nearer to the magnetic recording medium than the end face facing the magnetic recording medium of the high-permeability magnetic member. CONSTITUTION:A pair of high-permeability magnetic thin films 12 are stuck to high- permeability magnetic members 13 forming a gap 11 of a ring-shaped magnetic head of a magnetic recording and reproducing head so that end faces facing the surface of the medium are placed a certain length apart from end faces 15 facing the surface of the medium of high-permeability magnetic members 13. With respect to positions of high-permeability magnetic thin films 12 and high-permeability magnetic members 13 relative to the medium moving direction, high-permeability magnetic thin films 12 are in the trailing edge side. The magnetic flux passing high-permeability magnetic members 13 is concentrated in high-permeability magnetic thin films to generate a sharp magnetic field of very high intensity. Thus, the peak shift of the reproduced signal is reduced extremely.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention provides a magnetic recording medium that is parallel to the film surface of the magnetic recording medium, and
The present invention relates to so-called lateral recording, in which magnetization is formed in a direction perpendicular to the direction of movement relative to a magnetic recording medium, and particularly to a magnetic recording/reproducing head with improved recording/reproducing efficiency.

[Conventional technology]

The currently commonly used method for magnetic recording is so-called longitudinal recording, in which recording is performed in a direction parallel to the medium surface and parallel to the relative movement direction of the medium.

Due to the recent demand for larger capacities in external storage devices, in longitudinal recording, the film thickness of the medium is reduced to reduce the demagnetizing field, and the coercive force and saturation magnetization of the medium are increased. However, it is approaching its limit.

In contrast, recently, a so-called perpendicular recording method using a medium having an axis of easy magnetization in a direction perpendicular to the film surface has been intensively researched. This is because magnetization is formed in the direction perpendicular to the medium surface, so the demagnetizing field is very small, and
This is because residual magnetization is stably formed and it is thought to be suitable for high-density recording. However, since the residual magnetization of the medium forms an internal magnetic path due to the interaction between adjacent bits, it has the disadvantage that leakage flux is small because it is stable. Therefore, the spacing between the head and the medium must be kept extremely small, which is currently a very big problem from the point of view of reliability.

In contrast, lateral recording, which has been studied for a long time, has recently attracted attention because it is suitable for increasing track density as one of the methods for increasing capacity. FIG. 2 shows an outline of the magnetization direction within the medium due to this lateral recording, in comparison with the case using longitudinal recording. Figure 2 (
Fig. 2(b) shows the magnetization direction in the medium due to longitudinal recording.
) indicate the magnetization direction within the medium due to lateral recording, respectively.

In lateral recording, magnetization is formed in a direction parallel to the medium surface, but unlike longitudinal recording, magnetization is recorded in a direction perpendicular to the direction of relative movement of the medium.

For this lateral recording, a ring-shaped magnetic head having a gap portion as shown in FIG. 3 is used. According to this ring-shaped magnetic head, the medium is magnetized by the magnetic flux leaked out from the gap 11 formed by the opposing cores 13 by the excitation current.

[Problem that the invention seeks to solve]

FIG. 4 shows the magnetic field strength H in the direction parallel to the medium surface of the ring-shaped magnetic head described above. The magnetization within the medium is determined at a certain value of trailing edge magnetic field strength. However, as is clear from this figure, head core 1
Since the magnetic field strength corresponding to 3 shows a nearly constant value, the value of this magnetic field strength changes due to surface runout of the medium, vibration of the head, etc., and magnetization is not always determined at a fixed location. It disappears. This is a peak shift.

This method has the drawback of causing signal-to-noise ratio deterioration, etc., and lowering the error rate. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording/reproducing head that realizes lateral recording with a high track density and high recording density while minimizing beat shifts and the like.

[Means for solving problems]

The present invention provides a magnetic recording/reproducing head that generates magnetic flux in a direction perpendicular to relative movement with a magnetic recording medium having an axis of easy magnetization in a direction parallel to the film surface. The trailing edge side of the high magnetic permeability magnetic member is arranged such that the end face facing the magnetic recording medium is located closer to the magnetic recording medium side than the end face facing the magnetic recording medium of the high permeability magnetic member. It is characterized by being equipped with a high permeability magnetic thin film.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partial schematic perspective view of a magnetic recording/reproducing head showing an embodiment of the present invention. This magnetic recording/reproducing head has a set of high permeability magnetic thin films 12 on a high permeability magnetic member (core) work 3 forming a gap 11 of the ring-shaped magnetic head shown in FIG. The end face 14 of the high permeability magnetic member 13 is positioned at a certain distance from the end face 15 of the high permeability magnetic member 13 facing the medium surface. High permeability magnetic thin film 1
2 and the high permeability magnetic member 13 relative to the medium movement direction (indicated by arrow A in the figure).
is configured so that it is on the trailing edge side.

The high permeability magnetic thin film 12 is made of, for example, Co-Zr or C.

A magnetic material such as -Zr-Nb or permalloy is formed by sputtering, plating, or vacuum deposition. The high permeability magnetic member 13 is, for example, MnZ n s N
A magnetic material such as iZn is formed by machining or the like.

FIG. 5 shows the magnetic field strength H in the direction parallel to the medium surface of the magnetic recording/reproducing head of the embodiment shown in FIG.

The magnetic flux passing through the high permeability magnetic member 13 is the high permeability magnetic thin film 1
2, it is concentrated and generates a very strong and sharp magnetic field strength. Therefore, since the magnetic field strength at the trailing edge of the high permeability magnetic thin film 12, which determines the magnetization transition of the medium, changes rapidly, a very sharp magnetization distribution can be formed. As a result, even if the magnetic field strength within the medium changes somewhat due to surface runout of the medium, vibration of the head, etc., the peak shift in the reproduced signal can be suppressed to an extremely small level due to its sharpness. Furthermore, since the recording density is determined by the thickness of the high permeability magnetic thin film 12, high recording density recording and reproduction is possible. Furthermore, if the gap between the heads is narrowed, that is, the track pitch and the 7th inch are sandwiched, and a high track density can be realized.

〔Effect of the invention〕

The magnetic recording/reproducing head of the present invention can reduce the peak shift of the reproduced signal caused by surface runout of the medium, vibration of the head, etc., which has been a problem in lateral recording, and can realize recording and reproduction with a good error rate. .

Furthermore, by using the head of the present invention, high track density and high recording density can also be achieved.
It becomes possible to obtain a large capacity magnetic disk device.

[Brief explanation of the drawing]

FIG. 1 is a partial schematic perspective view of a magnetic recording/reproducing head showing an embodiment of the present invention, FIG. 2 is a schematic diagram showing the magnetization direction in the medium, and FIG. 3 is a conventional ring-shaped magnetic head for transverse recording. FIG. 4 is a diagram showing the magnetic field strength in a direction parallel to the medium surface of the ring-shaped magnetic head, FIG. 5 is a diagram showing the magnetic field strength in the direction parallel to the medium surface of the magnetic recording/reproducing head of the embodiment shown in FIG. FIG. 3 is a diagram showing magnetic field strength in different directions. 11...Gear Tsubu

Claims (1)

[Claims] (1) A magnetic recording/reproducing head that generates magnetic flux in a direction perpendicular to relative movement with a magnetic recording medium having an axis of easy magnetization in a direction parallel to the film surface, including a high permeability magnetic member that forms a gap. , on the trailing edge side of the high magnetic permeability magnetic member, such that the end face facing the magnetic recording medium is located closer to the magnetic recording medium side than the end face facing the magnetic recording medium of the high permeability magnetic member, A magnetic recording/reproducing head characterized by being equipped with a high permeability magnetic thin film.