JPS62129912A - Vertical magnetic head - Google Patents

Abstract

PURPOSE:To evade effectively a fall in recording and reproducing level due to an external magnetic field by providing plural main magnetic poles in the recessed part of a magnetic body block with high magnetic permeability across actuators. CONSTITUTION:Main magnetic poles 45A and 45B for recording and reproducing are arranged across actuators 39A and 39B composed of piezoelectric elements formed by laminating element pieces on the ceiling part of the recessed part 46a of the shield block 46 made of the box lid type magnetic material with high magnetic permeability. Then, an auxiliary magnetic pole shield block 49 is provided opposite across a recording medium 4. The actuator 39A expands when powered on to slides on the medium 4 and then a magnetic field 55A is produced; and an external magnetic field 56 even when applied as shown by an arrow X3 exits from the block 53 through the block 46. Thus, the external magnetic field is shielded to evade effectively a fall in recording and reproducing level and a fall in recording level when the head slides on the medium 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a perpendicular magnetic head, and more particularly to a perpendicular magnetic head whose recording/reproducing output level is not affected by an external magnetic field.

[Prior Art] In the perpendicular magnetic recording method in which a magnetic recording medium is magnetized in the direction of its thickness, in principle, the shorter the wavelength (higher frequency) of the magnetization that is magnetically recorded, the more It is known that it is suitable for high-density recording because its self-demagnetizing field is small.

To perform such perpendicular magnetic recording, a magnetic recording medium with large perpendicular magnetic anisotropy and a magnetic recording head that generates a sharp and strong perpendicular component magnetic field are required. As methods for performing perpendicular magnetic recording, there are known an auxiliary pole excitation type perpendicular magnetic head system and a main pole excitation type perpendicular magnetic head system.

In the above-mentioned auxiliary magnetic pole excitation type perpendicular magnetic head system, as shown in FIG. Winding 2b for information signal current transmission and reception
The auxiliary magnetic poles 2 and the auxiliary magnetic poles 2 are arranged to face each other with a predetermined gap 3 therebetween. When performing magnetic recording and reproduction, a magnetic recording medium 4 is run through the gap 3, and the magnetized film of the medium 4 is brought into sliding contact with the -2 main pole film 1. The magnetic recording medium 4 has a high permeability magnetic layer 4 made of Fe-Ni permalloy or the like on a base 4a made of a molecular film or the like and having l'lJ flexures.
A perpendicular magnetic recording layer 4c having an axis of easy magnetization perpendicular to the medium surface is formed at a point ``-''.

The operation of the auxiliary pole-excited perpendicular magnetic head configured as described above is such that when an information signal sent from a signal generator (not shown) is applied to the winding 2b, a magnetic field is generated in the auxiliary pole 2, and this magnetic field acts on the main magnetic pole 1 and generates a sharp magnetic field at the tip of the main magnetic pole 1. The information signal is magnetically converted and recorded on the magnetic recording medium 4 by this sharp magnetic field.

In addition, in the trapping magnetic pole excitation type perpendicular 11° J magnetic head system, since the magnetic flux flow is in an open magnetic path configuration, the above-mentioned sharp magnetic field is caused, for example, from the main magnetic pole 1 to the magnetic recording medium. 4 - After flowing through the magnetic path called auxiliary magnetic pole 2, it passes through space and returns to the main magnetic pole 1.

By the way, in the open magnetic path configuration as described above, the influence of the external magnetic field due to the motor for driving the magnetic recording medium 4 or the earth's magnetism ([one line is said to be 0.3 to 0.4 oersteds]), etc. Easy to accept. That is, if this external magnetic field is applied perpendicularly to the magnetic recording medium 4 as indicated by the thick arrow X shown in FIG.
．． The magnetic field passing through the magnetic recording medium 4 and the auxiliary magnetic pole 2 is as shown by the thin arrow. Therefore, if the above-mentioned strong external magnetic field is applied when magnetic recording of - information signals is completed and this magnetic recording is occurring by +1, depending on the magnitude of this external magnetic field, IIf generation of +1 raw signal will occur. The output level may be reduced.

When such a phenomenon is actually measured, it becomes as shown in FIG.

That is, in the auxiliary pole excitation type perpendicular magnetic head system shown in FIG. 6, perpendicular external magnetic fields of several different intensities are applied to the magnetic recording medium 4. Then, if the reproduction output level when no external magnetic field is applied is taken as "1" on the vertical axis, and the applied external magnetic field (unit: Oe (Oersted)) is taken on the horizontal axis, as shown in FIG. 7 above, When the external magnetic field becomes 1 oersted, the reproduction output level becomes almost zero.

The influence of an external magnetic field is not only the decrease in the recording output as described above, but also the decrease in the recording level, or when the magnetic head comes close to or comes into sliding contact with a medium that has already been recorded. This appears as a reducing effect on the residual magnetization of the medium in some cases. The reason why such an effect of an external magnetic field appears is considered to be due to the following principle.

Figure 8 is a diagram showing the B-H characteristics of the main pole of a perpendicular magnetic head, and Figure 9 is a diagram showing the B-H characteristics of a 1;8 recording medium magnetized by a perpendicular magnetic head operating with the characteristics shown in Figure 8. FIG. 3 is a diagram showing characteristics. In the absence of an external magnetic field, the main magnetic pole moves to the origin O as shown in FIG.
It is magnetized in the positive and negative directions around the center to a magnetic flux density of approximately the saturation level ±Bs. On the other hand, the recording medium is magnetized in the positive and negative directions to the saturation level magnetic flux density as shown in FIG. 9 by the magnetic field generated by the main magnetic pole magnetized as described above.
The residual magnetic flux ±Br is maintained. This state is a state in which normal magnetic recording is performed on the recording medium. When an external magnetic field (for example, a positive direct current magnetic field due to the earth's magnetism or a DC motor magnet) is applied, the magnetizing force (magnetic field) acting on the main pole is
This external magnetic field acts harmonically (that is, the magnetizing force shifts in the j direction (positive on the horizontal axis in Figure 8))
. As a result, the operating center of the magnetization (magnetic flux density) of the main pole moves to point A in Figure 8, so even if it is magnetized to the saturation level Bs in the positive direction, the saturation level - - in the negative direction.
It may happen that Bs is not magnetized. in this way,
When a recording medium is magnetized by a magnetic field emitted from a main pole with a biased magnetization state, the residual magnetic flux in the recording medium maintains the above-mentioned +Br in the positive direction, but the absolute value in the negative direction decreases. Only the smaller -Bk (see Figure 9) will be retained. In other words, the external magnetic field causes a decrease in the magnetic recording level.

Next, a state in which the perpendicular magnetic head is in close proximity to or in sliding contact with a recording medium whose magnetization state is biased, such as in a double series (6th
In the state shown in the figure @), when an external magnetic field is applied that reaches the magnetization of the main magnetic pole to point A in Fig. 8, the magnetizing force of this external magnetic field (the magnetic field mainly focused on the main magnetic pole) causes recording. The magnetization state in the medium is the initial residual magnetization -B
k to the value corresponding to point A' in FIG.

After this change, even if the external magnetic field is removed and the magnetizing force by the main pole disappears, the magnetization state of the recording medium does not return to the original residual magnetization -Bk, but has a smaller absolute value -Bk.
' (see Figure 9). This is because, as is well known, the relationship between changes in the magnetic field (magnetizing force) and the corresponding magnetization (magnetic flux density) is irreversible.

As mentioned above, when an external magnetic field is applied to a recorded magnetic recording medium and then the applied state is removed, the residual magnetization (i.e., the magnetic recording level) will be reduced. . It goes without saying that this tendency is particularly noticeable when the main pole of the perpendicular magnetic head is close to or in sliding contact with the recording medium.

Next, we will consider the case where an external magnetic field (the same DC magnetic field as described above) is applied when reproducing recorded information from a medium on which normal magnetic recording has been performed as described above.

In this case, since the external magnetic field harmonically acts on the magnetic field emitted from the already recorded medium, the operating point at the main pole of the perpendicular magnetic head is more positive than the origin 0 on the horizontal axis in FIG. direction, and moves to point A1 or, if the external magnetic field is particularly strong, to point B. B-H in Figure 8
As is clear from the characteristics, when operating around point A or point B, the magnetization (magnetic flux density in the main pole The rate of change of R) is significantly reduced and becomes almost zero in the positive direction from point B. Therefore, the reproduction sensitivity decreases.

In this way, the decrease in the recording level due to the influence of an external magnetic field (If raw level, = lf2, and the decrease in the recording level of the medium when the magnetic head comes close to or in sliding contact with the medium that has already been recorded, is due to the above-mentioned auxiliary magnetic pole excitation. This phenomenon is observed not only in the type perpendicular magnetic head system, but also in the above-mentioned main pole excitation type perpendicular magnetic head system.In other words, in the perpendicular magnetic recording system, the external magnetic field is greater than in the conventional longitudinal recording system. It is known that the influence of

By the way, in general, there is a technique for installing a shield to prevent electromagnetic induction interference (for example, ``Electronic Circuit Noise and Trouble Countermeasures'' written by Mitsuru Nariki, published by JCQ Publishing Co., Ltd. also includes two articles).
, or the technology of providing a shield to prevent electrostatic noise (see Japanese Patent Application Laid-Open No. 186112/1983), but these all have the problems inherent to perpendicular magnetic recording as described above. The technology to solve this problem has not yet been established.

Therefore, the present applicant first provided a magnetic shield by surrounding the main pole of a perpendicular magnetic head with a high permeability magnetic member, thereby reducing the recording/reproducing level due to the influence of the external magnetic field even when an external magnetic field is applied. We have proposed a perpendicular magnetic head that prevents the recording level from decreasing on a recorded recording medium when the magnetic head comes close to or in sliding contact with the recorded recording medium (Japanese Patent Application No. 59-255458). .

This perpendicular magnetic head previously proposed by the present applicant will be explained below.

FIGS. 10(A), (B), and (C) show a tonnao magnetic head previously proposed by the present applicant.
This is an auxiliary magnetic pole excitation type perpendicular magnetic head. As the magnetic recording medium 4, it is desirable to use one exactly the same as that shown in FIG. That is, as mentioned above,
The magnetic recording medium 4 has a high permeability magnetic layer 4b made of Fe-Ni permalloy etc. formed on a flexible base 4al made of a polymer film etc. Perpendicular magnetic recording layer 4C with easy axis of magnetization
It is composed of

As shown in FIGS. 10A, 10B, and 10C, the auxiliary pole excitation type perpendicular magnetic head 30 includes a main pole block 15, a main pole shield block 16, an auxiliary pole shield block 19, an auxiliary pole 22, etc. It is configured with the following.

The main pole block 15 is made of an amorphous magnetic metal such as cobalt zircon niobium, cobalt zircon molybdenum, permalloy, sendust, etc. The left and right side surfaces (5 in FIG. 10(A)) of the main pole film 11 are made of crystalline glass. , are sandwiched by main pole sandwiching portions 12 and 13 made of non-magnetic ferrite, etc., and these main pole films 1
1. The lower surface of a magnetic block 14 made of a high magnetic permeability magnetic material such as manganese zinc ferrite or nickel zinc ferrite is bonded to the curved portions of the holding members 12 and 13. The lower surface of the main magnetic pole block 15 is polished into an arc shape, and the lower end surface of the main magnetic pole film 11 is exposed.

A box-lid-shaped main pole rolled block 16 made of the same material as the magnetic block 14 and having a recess 16a with an open bottom is disposed so as to surround the entire main pole block 15. . The gap between the main magnetic pole shield block 16 and the main magnetic pole block 15 is filled with epoxy resin, water glass, or the like. Semi-cylindrical pads 17 and 18 made of a lubricating material such as glassy carbon are bonded to the outer ends of the left and right lower end surfaces of the main magnetic pole shield block 16. The pads 17, 18 and the lower end surfaces of the main pole film 11 are arranged so as to be on the same plane.

The auxiliary magnetic pole shield block 19 has a thick plate shape made of the same material as the magnetic material block 14, and has a width equal to 2/2 of the main magnetic pole shield block 16.
The auxiliary magnetic pole 22 made of a short cylindrical ferrite or the like is bonded to the central part of the upper surface of the magnetic block 23, which faces the lower end surface of the main magnetic pole film 11. A winding 24 for signal transmission and reception is wound around the outer periphery of this auxiliary magnetic pole 22. In addition, the magnetic block 2
A semi-cylindrical pad 20.degree. 21 made of the same abrasive material as the pad 17.degree.

The surface of the auxiliary m-pole shield block 19 having the auxiliary magnetic pole 22 and the lower surface of the main magnetic pole block 15 having the main magnetic pole film 11 and the main magnetic pole shield block 16 are arranged to face each other with an appropriate gap. has been done. This air gap is extremely narrow, making it difficult for external magnetic fields to enter. Further, the magnetic recording medium 4 is pressed on both the front and back sides by the pads 17.degree. 18 and the pads 20.21, and runs in the direction of the arrow X1 while slidingly contacting the main pole film 11 between the gaps. .

When magnetic recording is performed using the auxiliary pole excitation type perpendicular magnetic head 30 configured as described above, FIG.
As shown in FIG. 2, the magnetic field generated by the auxiliary Ia pole 22 and the main magnetic pole film 11 is shaped like two narrow ellipses on the left and right, as shown by reference numeral 25. Also, during magnetic recording or after magnetic recording, an external magnetic field perpendicular to the magnetic recording medium 4 (
Even if an external magnetic field (indicated by arrow
The light is divided into left and right parts and proceeds in the left and right directions, passes through the magnetic recording medium 4, reaches the magnetic block 23, and is further dissipated into the air from the bottom surface of the magnetic block 23. In other words, the inner magnetic field indicated by the symbol 25 and the outer magnetic field indicated by the symbol 26 are completely separated, and the outer magnetic field (external magnetic field) influences the inner magnetic field (recording magnetic field). It will not affect you. Therefore, a decrease in the recording/reproducing level caused by an external magnetic field, as well as a decrease in the recording level of the medium when the magnetic head comes close to or comes into sliding contact with the medium at the recorded edge, is effectively avoided.

Incidentally, if the upper J pads 17, 18 and 20, 21 have soft magnetism, the shielding effect can be greatly improved.

[Problems to be solved by the invention] By the way, the main pole of the perpendicular magnetic head 30 according to the above-mentioned proposal of the present applicant is one in which the main pole block 15 is fixed within the main pole shield block 16 with epoxy resin or the like. Therefore, even if an attempt is made to finely adjust only the main pole for azimuth adjustment or the like, the entire perpendicular magnetic head must be operated, and the mechanism for this has to be considerably larger.

The present invention has been made in view of these problems, and provides a perpendicular magnetic head that prevents the influence of external magnetic fields on the recording/reproducing output level and that allows fine, 2+J alignment of only the main pole. The purpose is to provide

[Means and effects for solving the problems] In order to achieve the above object, the present invention provides a predetermined recess in a high magnetic permeability magnetic block, and a main magnetic pole is attached to the inner wall of the recess via an actuator. In addition to eliminating influences from attachment and external magnetic fields, the main magnetic pole can be finely adjusted by slightly moving the actuator.

[Example] Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1(A) shows a perpendicular magnetic head showing a first embodiment of the present invention. This perpendicular magnetic head 60 is shown in FIG.
Similar to the perpendicular magnetic head 30 shown in FIG.
5A, a main magnetic pole block 45B for reproduction, a main magnetic pole shield block 46°, an auxiliary magnetic pole shield block 49, and auxiliary magnetic poles 52A and 52B.

The main magnetic pole shield block 46 has a box-lid shape with an open bottom, and the recess 4 of the main magnetic pole shield block 46
Main magnetic pole blocks 45A and 45B for recording and reproduction are disposed on the ceiling of 6a, respectively, via actuators 39A and 39B made of piezoelectric elements in which pieces are stacked in a layered manner.

These blocks 45A and 45B are magnetic blocks 44A made of high magnetic permeability magnetic materials such as manganese zinc ferrite and nickel zinc ferrite.

It has 44B. Further, the main magnetic pole shield block 46 is also made of the manganese zinc ferrite or the like.

On the lower end surface of the magnetic block 44A of the recording main pole block 45A, a main pole film 41A made of, for example, a soft magnetic film with a high saturation magnetic flux density is sandwiched between the left and right sides by a main pole made of crystallized glass, non-magnetic ferrite, etc. They are sandwiched and joined by members 42A and 43A. In addition, on the lower end surface of the magnetic block 44B of the main magnetic pole block 45B for reproduction,
For example, the main pole film 41 is made of a soft magnetic film with high initial magnetic permeability.
B is sandwiched and joined on both the left and right sides by main pole sandwiching members 42B and 43B made of crystallized glass, non-magnetic ferrite, or the like. For the above records.

The lower surface of each of the main magnetic pole blocks 45A and 45B for reproduction is polished into an arc shape, and the main magnetic pole film 41A of each
, 41B are exposed.

1. Semi-cylindrical pads 47.48 made of a lubricating material such as glassy carbon are bonded to positions near the outer ends of the left and right lower end surfaces of the main magnetic pole shield block 46. Main pole films 41A, 41
The lower end surface of B is arranged in a slightly recessed state.

The reason for the recessed arrangement is that either the recording or reproducing main pole block must be selectively brought into sliding contact with the magnetic recording medium, and for this reason, as will be described later, the actuator 39A or 39B is This is because one of the two must be expanded while the other remains in its original state so that it does not come into sliding contact with the medium.

Also, the main magnetic pole shield block 46 is used for recording.
An auxiliary magnetic pole shield block 49 is disposed at a position facing the main magnetic pole integrally formed surrounding the main magnetic pole blocks 45A and 45B for reproduction, with the magnetic recording medium 4 in between.

The auxiliary magnetic pole shield block 49 has a magnetic block 53 made of a high magnetic permeability magnetic member of the same quality as the magnetic blocks 44A and 44B of the main magnetic pole shield block 46 and the main magnetic pole blocks 45A and 45B, and has the same magnetic properties. L recording main magnetic pole block 4 on the -[- side of the body block 53
Auxiliary magnetic poles 52A and 52B made of ferrite or the like having a y-equal rectangular column are bonded or integrally formed with the magnetic block 53 at positions facing the main magnetic pole film 41A of 5A and the main magnetic pole film 41B of the reproduction main magnetic pole block 45B, respectively. A winding 5 is provided on the outer periphery of each of the auxiliary magnetic poles 52A and 52B.
4A.

54B is wound. Joined to the left and right ends of the upper surface of the magnetic block 53 are cylindrical pads 50.51 of the same lunar quality as the pads 47.48.

The operation of performing magnetic recording and reproducing using the auxiliary pole excitation type perpendicular magnetic head 60 configured as described above will be described. First, during recording, when a predetermined voltage is applied to the actuator 39A from a control circuit (not shown), the actuator 39A
9A is extended, and the end face of the main pole film 41A is connected to the magnetic recording medium 4.
sliding into contact with.

At this time, the medium 4 is connected to the main magnetic pole shield block 46 and h
Both the front and back sides are pressed by the pads 47, 48 and 50, 51 between the 8 auxiliary magnetic pole shield blocks 49, and travel in the direction of the arrow Y1 while slidingly contacting the recording main magnetic pole film 41A. In addition, during recording, the main magnetic pole film 41B for reproduction is as shown in FIG.
Since it remains in the position shown in A), the main pole film 41B does not come into sliding contact with the magnetic recording medium 4.

Next, when a recording signal is applied to the winding 54A, the signal shown in FIG. 1 (B
), the same signal activates the recording auxiliary magnetic pole 52A.
A magnetic field is generated between the main magnetic pole film 41A and the main magnetic pole film 41A so that a magnetic flux passes along a path indicated by the reference numeral 55A.

During such magnetic recording or after magnetic recording, an external magnetic field (indicated by arrow X3) is applied in a direction perpendicular to the magnetic recording medium 4.
Even if a The body block 53 is scattered into the air. In other words, the magnetic field applied from the outside (external magnetic field) is completely separated from the recording magnetic field, which is the inside magnetic field, and has no effect on the inside magnetic field.

Therefore, this perpendicular magnetic head 60 effectively avoids a decrease in the recording level caused by an external magnetic field, as well as a decrease in the recording level of a medium that has already been recorded even when the magnetic head approaches or comes into sliding contact with the medium. can do.

Further, during reproduction, contrary to the above, a predetermined voltage is applied to the actuator 39B to cause it to expand, thereby bringing the reproduction main pole film 41B into sliding contact with the magnetic recording medium 4. If a predetermined reproduction process is performed in this state, the reproduction magnetic field will not be affected by the external magnetic field, as in the case of recording described above.

Next, the second embodiment of the present invention is shown in FIGS. 2(A) and (B).
, explained by. The perpendicular magnetic head 70 is a main pole excitation type perpendicular magnetic head. In the following description of each embodiment, members that have already been explained in the first embodiment will be given the same reference numerals to avoid redundant explanation.

As shown in FIG. 2(A), the main magnetic pole shield block 4
Actuators 39A, 3 are mounted on the ceiling of the recess 46a of 6.
Main magnetic pole blocks 67 for recording and reproduction, respectively, via 9B.
A and 67B are arranged. These blocks 67A
, 67B are constructed with magnetic blocks 61A and 61B made of a high magnetic permeability magnetic material such as manganese zinc ferrite, nickel zinc ferrite, or the like. Grooves are formed in the lower end surfaces of these magnetic blocks 61A, 61B so that the cross-sectional shape is inverted convex, and windings 62A, 62B are wound around these convex portions, respectively. On the lower end surfaces of the blocks 61A and BIB, main magnetic pole films 41A and 41B made of, for example, a soft magnetic film with high transparent magnetic permeability are provided on both left and right sides with main magnetic pole films 11 made of crystallized glass, non-magnetic ferrite, etc. Members 64A, 65A and 64B, 6
5B.

Further, a pad mounting block 66 is provided below the main pole block 46. The pad mounting block 66 is a rectangular plate made of the same material as the magnetic blocks 44A and 44B (see FIG. 1(A)), and the center part of the pad mounting block 66 is made of the same material as the magnetic blocks 44A and 44B (see FIG. 1(A)). 6
Convex portions 66a corresponding to 1A and GIB are provided.

Furthermore, semi-cylindrical pads 69A and 69B are joined to the upper surface of the pad mounting block 66 near both left and right ends.

and '-2 main magnetic pole blocks 67A, 67B.

The entire lower surface including the lower end surface of the main magnetic pole shield block 4δ and the upper surface having the convex portion 66a of the pad mounting block 66 are arranged to face each other with a predetermined gap in between. The magnetic recording medium 4 is placed between this gap, and the pads 47, 48 and 69A are placed on both sides of the medium.

69B, and the main magnetic pole film 41A.

41B while running. Note that by providing the convex portion 65a, the magnetic resistance can be reduced and the efficiency of the main pole excitation type perpendicular magnetic head can be improved.

Main pole excitation type perpendicular magnetic head 70 configured as described above
When performing magnetic recording using the actuator 39A
Expand and record. During this recording, even if an external magnetic field is applied from the direction indicated by the arrow X4 as shown in FIG. The magnetic path 72 and the external magnetic field indicated by 72 are completely separated, and the aforementioned problems caused by external magnetic fields are effectively avoided.

In the case of reproduction, the actuator 39B may be extended to bring the reproduction main pole film 41B into sliding contact with the magnetic recording medium 4, contrary to the case of double recording. In this case as well, it is not affected by external magnetic fields as in the case of double series.

Next, a third embodiment of the present invention will be described with reference to FIG.

This embodiment is a case in which tilt adjustment is performed for a main pole excitation type perpendicular magnetic head. As shown in FIG. 3, a main magnetic pole block 83 for recording is attached to the ceiling of the recess 4Ga of the main magnetic pole shield block 46 via two actuators 81 and 82. Winding wire 84
is wound.

To perform reproduction using such a perpendicular magnetic head,
Assuming that the magnetic recording medium 4 is moving in the direction indicated by the symbol Y2, the reproduced signal at this time is detected by an appropriate means. Then, based on the result, a control voltage is applied to the actuator 81 or 82 from a control circuit (not shown). Then,
Since these actuators 81 and 82 expand and contract as indicated by the symbol Q 1 or Q 2 , the angle (that is, tilt) of the main pole film with respect to the magnetic recording medium can be adjusted.

In this way, the above-mentioned 1. As in the second embodiment, even if an external magnetic field is applied, the path of the internal magnetic field for recording or reproducing can be guarded.

Next, a fourth embodiment of the present invention will be described based on FIG. 4.

This embodiment is a case where tracking: J:J'M is provided. As shown in the figure, there is a recess 9 in the main pole shield block 91.
1a is formed, and actuators 93 and 94 are attached to the left and right side wall surfaces of this recess 91a in pairs. And, "2 actuators 93 and 9
A main pole block 92 is disposed sandwiched between the main pole blocks 4 and 4.

A rounded main pole film is formed on the lower end surface of the ``-2 main pole block 92, and a shield block 95 is disposed below this main pole film. And magnetic recording medium 4
As shown by the symbol Z, it progresses from the front to the back of the page.

To perform tracking with such a perpendicular magnetic head, the actuator 9 must be controlled from a control circuit (not shown).
A control voltage may be applied to 3.94 so that the main magnetic pole j comes into contact with the required track position.

Next, a fifth embodiment of the present invention will be described based on FIG.

This embodiment is a case where azimuth adjustment is performed. FIG. 5 is a diagram showing the perpendicular magnetic head with the magnetic recording medium 4 visible. As shown in the figure, a recess 101a is formed in the main magnetic pole shield block 101. Inside this recess 101a are the main pole blocks 1 (actuators 103 to 12 each having four pieces).
106. That is, the recess 101
One side wall of a and -L, ? c! Two actuators 103 and 104 are interposed between the block 102 and two actuators 105 and 106 between the block 102 and the other side wall of the recess 101a.

In order to adjust the azimuth of the perpendicular magnetic head configured in this way, the optimum azimuth is determined based on the reproduction output detected from the main pole film, assuming that the magnetic recording medium 4 advances as shown by the symbol Y3. What is necessary is to carry out appropriate processing to obtain the voltage and apply a voltage that causes the actuators 103 to 106 to expand and contract.

In this way, the above-mentioned 1. Even if an external magnetic field is applied as in the second embodiment, it is possible to prevent the influence on the internal magnetic field.

Note that in this embodiment, four actuators 103 to 10
However, only two actuators diagonally opposite each other, such as actuators 103 and 106, may be used.

[Effects of the Invention] According to the present invention, when a perpendicular magnetic head approaches or contacts a magnetic recording medium that has already been recorded, the recording level on the recording medium decreases when the perpendicular magnetic head approaches or contacts the 4P and already recorded magnetic recording medium under the recording/III raw level generation level caused by an external magnetic field. can be defended.

[Brief explanation of drawings]

FIGS. 1(A) and 1(B) are a cross-sectional side view of an auxiliary pole excitation type perpendicular magnetic head according to a first embodiment of the present invention and a diagram showing a state in which an external magnetic field is applied, and FIG. ), (B
) is a cross-sectional side view of a main pole excitation type perpendicular magnetic head according to a second embodiment of the present invention, and a diagram showing a state in which an external magnetic field is applied. 3. 4. A diagram showing a perpendicular magnetic head according to the fifth embodiment, which has tilt adjustment, tracking adjustment, and azimuth adjustment, respectively. FIG. 6 is a side view showing the configuration of a conventional auxiliary pole excitation type perpendicular magnetic head. , FIG. 7 is a characteristic diagram showing the variation in the reproduction output level of the reproduction signal when an external magnetic field is applied to the conventional auxiliary pole-excited perpendicular magnetic head shown in FIG. 6 above, and FIG. FIG. 9 is a diagram showing the B-H characteristics of the main magnetic pole of the main magnetic pole of FIG. ), (13), (C), (D
) is a cross-sectional view, an exploded perspective view of the main parts, and a line diagram showing the paths of an external magnetic field and a recording/reproducing magnetic field of a conventional perpendicular magnetic head. 39A, 39B... Actuator (
piezoelectric element) 45A, 45B... Main pole block (main pole body) 46...
・・・・・・Main magnetic pole shield block (high magnetic permeability magnetic block) 46a・・・・・・・・・・・・Concave fan 1
Flash (A) See 2 [jA3 Figure 4, 91? )5 Figure O1 (Oersted)

Claims (3)

[Claims] (1) a high magnetic permeability magnetic block having a predetermined recess; a main magnetic pole disposed within the recess; and an actuator provided between the inner wall of the recess and the main magnetic pole; A perpendicular magnetic head comprising: (2) The inner wall of the recess is formed to have a bottom surface and a peripheral wall thereof, and the actuator is positioned at a plurality of predetermined locations between the bottom surface and the main pole body and between the peripheral wall and the main pole body. A perpendicular magnetic head according to claim 1, wherein a perpendicular magnetic head is provided. (3) The perpendicular magnetic head according to claim 1 or 2, wherein the actuator is made of a piezoelectric element.