JPH033104A - Perpendicular magnetic head device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Summary) The present invention relates to a perpendicular magnetic head device, and an object of the present invention is to enable side erasing and to reproduce signals with a good S/N ratio even when off-track occurs. A perpendicular magnetic head device that performs perpendicular magnetic recording and reproduction on a recording medium includes a magnetic head section that has a main pole and a coil, records and reproduces signals, and a magnetic head section that supports the magnetic head section via a nonmagnetic layer. It consists of a block made of soft magnetic material that has protrusions on both sides of the main magnetic pole in the scanning direction, and a mechanism that generates a magnetic field to apply a magnetic field to the block during recording. The magnetic flux of the generated magnetic field is concentrated on the protrusion of the block to erase both sides of the recording track formed by the main pole.

(Industrial application field) The present invention relates to a magnetic head device.

In the perpendicular magnetic recording method, recording is also performed by override, similar to horizontal recording.

Therefore, as in the case of horizontal recording, the S/N ratio decreases due to positional deviation of the magnetic head during reproduction, that is, off-track.

Therefore, it has been desired to be able to reproduce a good waveform with less noise even if the magnetic head is misaligned.

For this purpose, it is necessary to perform so-called side erasing during perpendicular magnetic recording, and it has been desired to realize a perpendicular magnetic head 5A that is capable of side erasing.

[Conventional technology]

11 and 12 show a conventional perpendicular magnetic head device 1. FIG.

2 is a soft magnetic block for external leakage magnetic field which also serves as a slider, and 3 is a nonmagnetic layer on the rear end surface of the block.

4 is a magnetic head portion on the nonmagnetic layer 3, and a main magnetic pole 5. It consists of a coil 6 and a return yoke 7.

This perpendicular magnetic head device 1 is attached to an actuator 11 via an arm 10, as shown in FIG. 13, and is in contact with each disk 12.

[Problem to be solved by the invention]

As shown in FIG. 14, let us consider a case where an information piece is recorded on a certain track, and information (2) is recorded over it. At this time, if a so-called off-track occurs in the perpendicular magnetic head device due to a positional shift of the 7-couple unit 11, an elongation of the disk 12 and arm 10 due to a rise in temperature, etc., information (2) is recorded as shown in FIG. A part of the information processing is left without being erased, as shown by reference numeral 13.

When reading this information ■, the perpendicular magnetic head device 1 (
If the main magnetic pole 5) is deviated from the recording track of information (1) as shown in FIG. 14, the portion indicated by reference numeral 13 will be reproduced and become noise, resulting in a decrease in the S/N ratio.

SUMMARY OF THE INVENTION An object of the present invention is to provide a perpendicular magnetic head device that enables side erasing and reproduces signals with a good S/N ratio even when off-track occurs.

[Means to solve the problem]

The present invention relates to a perpendicular magnetic head device that performs perpendicular magnetic recording and reproducing on a recording medium, comprising: a magnetic head section that has a main pole and a coil, and that records and reproduces signals; and a non-magnetic layer that covers the magnetic head section. A block made of soft magnetic material and having protrusions on both sides of the main magnetic pole in the scanning direction; and a mechanism for generating a magnetic field to apply a magnetic field to the block during recording; The magnetic flux of the magnetic field generated by the magnetic field generating mechanism is configured to concentrate on the protrusion of the block and erase both sides of the recording track formed by the main magnetic pole.

(Function) With a simple configuration consisting of a protrusion formed on a part of the block made of soft magnetic material and a magnetic field generation mechanism, so-called side erase is possible in perpendicular magnetic recording.

As a result, even when off-track occurs during playback,
It becomes possible to reproduce high quality signals with a high S/N ratio.

〔Example〕

1 and 3 show a perpendicular magnetic head device 20 according to a first embodiment of the present invention.

Reference numeral 21 denotes a magnetic head section, which includes a main magnetic pole 23 that is exposed to the disk facing member 22 for recording and reproducing, and a magnetic head section that applies magnetomotive force to the main magnetic pole 23 during recording and reproduces during reproducing. It consists of a conductor coil 24 that detects magnetic flux and a return yoke 25 that forms a magnetic flux return bus.

26 is a block made of soft magnetic material, which releases the magnetic flux of the external leakage magnetic field and prevents the magnetic flux from concentrating on the main magnetic pole 23.
3 and also functions as a slider. , 27 and 28 are floating rail parts.

A nonmagnetic layer 29 is formed on the rear end surface of the block 26.

The magnetic head section 21 is provided on the nonmagnetic layer 29.

30 is a magnetic field generation mechanism, which includes a coil 3 in a soft magnetic core 31.
2 is wound around the block 2 made of soft magnetic material.
It is arranged above 6.

FIG. 2 shows a magnetic disk device 35. As shown in FIG. The magnetic head device 20 described above is connected to an actuator 37 via an arm 36.
The magnetic disk 38 is supported by a magnetic disk 38, and is capable of contacting or floating on the magnetic disk 38.

The magnetic disk 38 has a structure in which a soft magnetic layer 41 and a perpendicular magnetic anisotropic layer 42 are laminated on a base 40.

In Figures 1, 2, and 4, 50.51 is a protrusion,
It is formed to protrude like a tooth from the rear end surface of the block 26 made of soft magnetic material.

As shown in FIG. 4, the protrusions 50 and 51 are embedded in the floating rail section 27 made of 8102, and only their tip surfaces are exposed to the disk facing surface 22 of the floating rail section 27.

The protrusions 50,51 are connected to the magnetic bed device 20 as indicated by arrows 52.
When viewed from the scanning direction with respect to the magnetic disk 38, the fifth
As shown in the figure, the inner edges 50a and 51a are the edges 23a on both sides of the main pole 23.

231).

The dimensions of each protrusion 50, 51 are as follows: width W is approximately 1 to 2 μm, and thickness t is extremely thin, approximately 0.5 μm.

The width W is the width of the girt band between adjacent tracks minus the amount of off-track that normally occurs, ie, the width that prevents the protrusion from penetrating into the adjacent track even if off-track occurs.

Note that, as shown in FIG. 6, the inner edges 50a and 51a of the protrusions 50.51 may be positioned somewhat inside the main magnetic pole 23.

Next, the operation of the above magnetic head device 2o will be explained.

As in the previous case, a certain track 60. Let us consider a case where information processing is recorded, information (■) is recorded over it, and then this information (■) is reproduced.

Furthermore, let us consider a case where a positional deviation occurs in the perpendicular magnetic head device 2o due to a positional deviation of the actuator 27, an elongation of the disk 11 and the arm 10 due to temperature fluctuations, and the like.

Figure 7 shows the information ■ in a state off-track by a dimension e1 in the direction of the arrow 61 with respect to the track 6° where the information ■ is recorded.
Indicates the state in which the data is being recorded.

At the time of recording, switches SW+ and SW2 in FIG. is recorded by the main magnetic pole 23 to form a track 64.

Further, a direct current from the direct current power source 65 flows through the switch SW2 to the coil 32, and the magnetic field generating mechanism 30 generates a magnetic field.

The magnetic flux of this magnetic field is sucked into the soft magnetic block 26 as indicated by the reference numeral 66 in FIG. The absorbed magnetic flux 66 is concentrated at the protrusions 50 and 51 as shown in FIG. The directions are aligned in the same direction and the information is erased.

In FIGS. 7 and 9, 67 is a track erased by the protrusion 50, and 68 is a track erased by the protrusion 51.

As a result, the information track 64 has a width W on both sides.
It is formed in a side-erased state, that is, in a side-erased state.

Next, the case where the track 64 is reproduced will be explained. At this time, as shown in the left part of FIGS. 8 and 9,
Assume that the magnetic head device 20 is off-track by a distance e2 with respect to the track 64 in the direction of the arrow 69.

Switches SW+ and SW2 are both switched to the contact R side, and the magnetic field generation mechanism 30 stops operating.

The signal read by the magnetic head section 21 passes through the switch S W +, passes through the reproducing circuit 70, and is output from the terminal 71.

Although the magnetic head device 20 is offset as described above, the portion of the main pole 23 protruding from the track 64 scans the erase track 68;
There is no signal reproduction from this part.

As a result, the track 64 has less noise and S/N
Reproduced with good ratio.

FIG. 10 shows a modification of the perpendicular magnetic head device of the present invention.

This perpendicular magnetic head device 80 has a magnetic field generating mechanism 82 constructed by winding a coil 81 around the soft magnetic block 26 itself.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to perform so-called side erasing in perpendicular magnetic recording with a relatively simple configuration, and as a result, even when off-track occurs during playback, high-quality recording with a high S/N ratio can be performed. It is possible to reproduce the signal.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a perpendicular magnetic head device according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a magnetic disk device to which the perpendicular magnetic head device of FIG. 1 is applied, and FIG. 3 is a diagram similar to that of FIG. FIG. 4 is a perspective view of the soft magnetic block in FIG. 1 turned upside down to show the main magnetic pole and the protrusion, and FIG. 5 is a cross-sectional view of the main magnetic pole and the protrusion. Figure 6 is a diagram showing another example of the positional relationship between the main pole and the protrusion, Figure 7 is the state during recording and shows the side erased state, Figure 8 is a diagram showing the positional relationship. 9 is a diagram showing the state when off-track occurs during reproduction. FIG. 9 is a diagram collectively showing the state during recording and off-track reproduction. FIG. 10 is a modification of the perpendicular magnetic head device of the present invention. 11 is a diagram showing a conventional perpendicular magnetic head device, and FIG. 12 is a diagram showing a conventional perpendicular magnetic head device.
The figure is a sectional view of the perpendicular magnetic head device shown in FIG. 11, FIG. 13 is a schematic configuration diagram of a magnetic disk device to which the perpendicular magnetic head device shown in FIG. 11 is applied, and FIG. 14 is during recording and reproduction with off-track. FIG. In the figure, 20.80 is a perpendicular magnetic head device, 21 is a magnetic head section, 23 is a main magnetic pole, 24 is a conductor coil, 26 is a block made of soft magnetic material, 29 is a nonmagnetic layer, 30.82 is a magnetic field generation mechanism, 31 is a soft magnetic core, 32.81 is a coil, 35 is a magnetic disk device, 38 is a magnetic disk, 4o is a base, 41 is a soft magnetic layer, 42 is a perpendicular magnetic anisotropic layer, 50 is a perpendicular magnetic anisotropic layer, 51 is a protrusion, 64 is a A recording track, 65 is a DC power supply, and 66 is a magnetic flux. Fig. 2 Fig. 3 Fig. 4 Fig. 6 Fig. 6 Fig. 6 No mosquitoes in bed, R11, S4 in the toilet = power 5 Friend 1 ℃ filter Fig. 7 Off on the shelf kJ Is there a student? Haru (Roku-Genii [O Figure 8

Claims (1)

[Claims] In a perpendicular magnetic head device that performs perpendicular magnetic recording and reproduction on a recording medium, a magnetic head section (21) that has a main pole (23) and a coil (24) and records and reproduces signals. and supports the magnetic head part (21) via a nonmagnetic layer (29),
Projections (50, 51) are provided on both sides of the main magnetic pole in the scanning direction.
), and a mechanism (30, 82) for generating a magnetic field to apply a magnetic field to the block (26) during recording, the magnetic field generating mechanism (30, 82) The magnetic flux (66) of the magnetic field generated by the above protrusion (50,
51) The recording track (
64) A perpendicular magnetic head device configured to erase both sides.