JPH09106528A - Magnetic head assembly and magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic head assembly capable of reducing the floating force generated on the sliding surface of a slider without reducing the area of the sliding surface, thereby making the wear amount of the contact part small by reducing the pressing force impressed on the slider, and also to provide a magnetic disk device using the magnetic head assembly. SOLUTION: The magnetic head 30 for recording/reproducing the information on the rigidly constituted magnetic disk is mounted on the slider 31a. In the magnetic head assembly 23a, the slider 31a is provided with the contact part 33 in slide contact with the magnetic disk at the time of recording/reproducing the information. The sliding surface 34 of the contact part 33 is divided into plural surfaces 41, 42, 43 by grooves 35a, 35b, and also the ratio area of the grooves 35a, 35b to the area of the contact part 33 confronted with the magnetic disk is set to the range of 10-80%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head assembly in which a slider is equipped with a magnetic head for recording and reproducing information on and from a magnetic disk having a rigid structure as a magnetic recording medium, and a magnetic disk device using the same. .

[0002]

2. Description of the Related Art In a magnetic disk device using a magnetic disk having a rigid structure as a magnetic recording medium, in order to increase the recording density, the bit density (density in the disk circumferential direction) and the track density (disk radial direction) are improved. It is necessary to realize both improvement of density).

Among these, in order to improve the bit density in particular, it is necessary to reduce the distance between the magnetic head, which is a magnetic recording / reproducing element, and the magnetic disk, that is, the so-called magnetic spacing.

A magnetic head used in this type of magnetic disk device is usually mounted on a slider and incorporated in the device as a magnetic head assembly. Until now, a method of completely flying the slider over the magnetic disk has been adopted. However, due to the demand for smaller spacing, a quasi-contact recording method in which a part of the slider is in quasi-contact with the magnetic disk and a contact recording method in which a part of the slider is completely in contact with the magnetic disk are being adopted. There is.

In order to realize the quasi-contact recording method and the contact recording method, it is necessary to reduce the wear of the contact portion. To this end, it is necessary to reduce the pressing load of the slider on the magnetic disk. Along with this, the size of the portion on which the magnetic head is mounted and the portion that supports the magnetic head is also reduced. For example, in the one disclosed in Japanese Patent Laid-Open No. 3-178017, the size of the magnetic head assembly including the supporting portion is 5.1
The width is 12.7 mm and the width is about 0.1 to 0.5 mm. Therefore, the area of the sliding surface that is in sliding contact with the magnetic disk is considerably small.

FIG. 23 shows a schematic structure of a conventional magnetic head assembly 1 adopting the contact recording system. As shown in FIG. 24, the magnetic head assembly 1 includes a slider 2 that slidably contacts the magnetic disk M when recording and reproducing information on the magnetic disk M, and a support portion 3 that supports the slider 2. , A magnetic head 4 including a pole, a yoke, a coil, etc., which is built in the slider 2 and performs a recording / reproducing function. The magnetic head 4 is so constructed that its magnetic poles are exposed on the sliding surface 5 of the slider 2. A lead wire for signal transmission connected to the magnetic head 4 is formed in the slider 2 and the support portion 3.

The support portion 3 is formed of a flexible member. When recording / reproducing information on / from the magnetic disk M, the supporting portion 3 continuously slides the sliding surface 5 of the slider 2 on the magnetic disk M by the restoring force caused by the bending, as shown in FIG. It is designed to generate sufficient pressing force to force it. In FIG. 24, the thick arrow 6 indicates the traveling direction of the magnetic disk M.

In the magnetic disk apparatus adopting the contact recording system, the magnetic head 4 is attached to the magnetic disk M regardless of the curved shape of the surface of the magnetic disk M in the radial and circumferential directions.
It is always required to make sure contact. For this purpose, the width W of the sliding surface 5 of the slider 2 must be suppressed to 300 μm or less. That is, the magnetic disk M having a rigid structure
In this case, the flatness of the disk is good, but the magnetic disk M may be bent (warped) with a maximum radius of curvature R of about 1 m as shown in FIG. 25 by mounting (tightening) on the spindle motor. is there. Now, the sliding surface 5 of the slider 2
Is W, and the gap between the center of the sliding surface 5 in the width direction and the magnetic disk M is s, W is W = (8 sR)
It becomes / 2. Assuming that the allowable spacing length is 10 nm which is the average surface roughness of the magnetic disk M, s
Since it is necessary to set <10 nm, W <about 300 μm.
Therefore, it is necessary to set W to 300 μm or less.

By the way, the pressing force applied to the slider 2 is a fluid force on the sliding surface 5 of the slider 2 when the disk rotates even if the pressing force fluctuates due to an attachment error of the magnetic head assembly 1 or the like. The levitating force that occurs must always be exceeded. The levitation force generated on the slider 2 changes depending on the pitch angle and the roll angle of the sliding surface 5.
Therefore, it is necessary to set the pressing force in consideration of these.

For this reason, in the conventional magnetic disk device, the fluctuation of the levitation force generated in the slider 2 is taken into consideration, and the pressing force sufficiently exceeding the levitation force is applied to the slider 2. . For this reason, the contact surface pressure of the sliding surface 5 increases, and the wear height after use for a long time (the height reduction due to wear) increases. As a result, the magnetic head 4
Changes in the characteristics of the
It was sometimes damaged.

Even if the width W of the sliding surface 5 is set to 300 μm or less, when the slider 2 is run at a sliding speed of several m / s or more with respect to the rigid magnetic disk M, the slider 2 slides. The levitation force generated on the moving surface 5 is still large. Therefore, in order to surely bring the magnetic head 4 into contact with the magnetic disk M,
It is necessary to apply a pressing force exceeding the floating force, for example, a pressing force of about 5 mN (50 mgf) to the slider 2. Therefore,
It was difficult to reduce the contact surface pressure of the sliding surface 5, and it was difficult to reduce wear of the magnetic head 4.

In FIG. 27, the sliding surface 5 of the slider 2 is 100
It is a plane of μm square, and as shown in FIG.
Is the average surface roughness of the magnetic disk M.
The results of analyzing the levitation force when the gap of the air inflow portion 8 is changed when the magnetic disk M is run at a speed of 9 m / s while being fixed to 10 nm are shown.

The gap between the air inlets 8 is extremely small (25 nm
Or less) or, on the contrary, extremely large (1.3 μm or more), the levitation force becomes 50 mgf or less. However, considering the head mounting error and the shake of the disk surface during rotation, the gap of the air inflow portion 8 cannot be made extremely small. Further, if the gap of the air inflow portion 8 is extremely large, it is difficult to secure the reliability of the magnetic head 4 because the magnetic pole of the magnetic head 4 needs to be provided at a position very close to the air outflow end 7. Therefore, even if the gap of the air inflow portion 8 is increased, the magnetic head 4 is located at a position upstream of the air outflow end 7.
Must be provided, resulting in a large magnetic spacing. That is, it is difficult to make the gap of the air inflow portion 8 extremely large.

As described above, in the conventional magnetic head assembly 1, since it is difficult to reduce the levitation force generated on the sliding surface 5 of the slider 2, the pressing force sufficiently exceeding this levitation force is applied. Must be added to slider 2. Therefore, the contact surface pressure cannot be reduced, and it is difficult to reduce wear of the sliding surface 5 of the slider 2 and the magnetic head 4.

By further reducing the area of the sliding surface 5 of the slider 2, the levitation force generated on the slider 2 can be reduced. However, in order to suppress spacing fluctuations due to vibration shocks from the outside and vibrations caused by disk rotation,
Since it is necessary to apply a minimum pressing force to the slider 2, if the area of the sliding surface 5 is reduced, the contact surface pressure will be increased. Therefore, even if the area of the sliding surface 5 of the slider 2 is further reduced, the amount of wear cannot be sufficiently reduced.

On the other hand, as described above, in the magnetic head assembly 1, the magnetic pole of the magnetic head 4 for recording / reproducing information on / from the magnetic disk M is exposed at the center of the sliding surface 5 in the width direction. It is generally installed in.

By the way, it is extremely difficult to eliminate an error in the production / attachment of the support member 3 in the usual production / assembly process. Therefore, a rolling moment is applied to the magnetic head assembly 1 due to the above-mentioned error. In the initial use of the magnetic head assembly 1, as shown in FIG. 28, either the left or right edge of the sliding surface 5 contacts the magnetic disk M. However, in many cases, the magnetic poles of the magnetic head 4 are not located in the minimum gap. For example, the sliding surface 5 has a width of 50 μm, the magnetic pole of the magnetic head 4 is at the center of the sliding surface 5 in the width direction, and it is 1/10 degree (about 1/570 rad).
If there is a roll angle of, the gap at the center is about 40 nm. High density recording (150kfci (flux chnges
per inch) or more), significant signal deterioration occurs.
As a result, for some time after the start of use (the period until the slider height reduction due to wear reaches a certain value),
Normal recording / playback will not be possible.

Therefore, in order to solve such a problem, the slider 2 is moved to a position shown by a two-dot chain line 7 in FIG.
It is conceivable to subject it to abrasion treatment. However, since a material having high wear resistance is used as a constituent material of the slider 5 because it is necessary to maintain a life of 5 years or more, a considerable wear treatment time is required to eliminate the gap of 40 nm. Therefore, with such a method, the production time becomes long and the cost increase cannot be avoided. In addition, it also becomes a factor that shortens the life of the magnetic disk.

[0019]

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the levitation force generated on a sliding surface without reducing the area of the sliding surface of the slider, thus reducing the pressing force applied to the slider and reducing the contact portion. It is an object of the present invention to provide a highly reliable magnetic head assembly capable of reducing the wear height of the magnetic disk and a highly reliable magnetic disk device capable of high density recording using the magnetic head assembly.

Another object of the present invention is to automatically set the relative position between the magnetic pole of the magnetic head and the magnetic disk to the optimum state without subjecting the slider to abrasion treatment after assembly, which is inexpensive and reliable. An object of the present invention is to provide a high magnetic head assembly and a highly reliable magnetic disk device capable of high density recording using the magnetic head assembly.

[0021]

In the magnetic head assembly and the magnetic disk drive equipped with the magnetic head assembly according to the present invention, since the sliding surface of the contact portion provided on the slider is divided into a plurality of grooves, It is possible to greatly reduce the levitation force generated on the sliding surface due to the presence of the groove without causing a large reduction in the sliding surface area. As a result, it is possible to reduce the pressing force applied to the slider, reduce the contact surface pressure of the sliding surface, and suppress the wear height of the contact portion to a small value.

In the magnetic head assembly and the magnetic disk drive using the magnetic head assembly according to the present invention, the rolling force applying means applies a rolling force exceeding the rolling moment to the slider. It is possible to automatically slide a specific portion of the contact portion provided on the magnetic disk onto the magnetic disk. By providing the magnetic pole of the magnetic head in a fixed positional relationship with respect to the above-mentioned specific portion, the magnetic pole of the magnetic head can be moved in a fixed positional relationship with respect to the magnetic disk without subjecting the slider to abrasion processing. Can be set automatically.

For example, when an inductive head is used as the magnetic head, if the magnetic pole is incorporated in advance so that the magnetic pole is located at the above-mentioned specific portion, the effective spacing will be the average surface roughness of the magnetic disk. Can be reduced to the value of. Further, when a head incorporating an element such as a magnetoresistive element (MR element) that does not like intrusion of sliding heat is used as the magnetic head, for example, it is previously set at a position apart from the specific portion by a predetermined amount. It is also possible to incorporate a magnetic pole.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially exploded perspective view of a magnetic disk device according to an embodiment of the present invention.

A magnetic disk 21 having a rigid structure (disk thickness / disk outer diameter> 1/500) for recording information is mounted on a spindle 22 and is rotationally driven at a constant rotation speed by a spindle motor (not shown). A magnetic head assembly 23 equipped with a magnetic head that accesses the magnetic disk 21 to record and reproduce information is attached to the tip of a thin plate spring 24. The leaf spring 24 is an arm 2 having a bobbin for holding a drive coil (not shown).
5 is connected to one end.

At the other end of the arm 25, a voice coil motor 26 which is a kind of linear motor is provided. The voice coil motor 26 is composed of a drive coil (not shown) wound around a bobbin of the arm 25, and a magnetic circuit composed of a permanent magnet and a facing yoke which are arranged to face each other so as to sandwich the drive coil. Arm 2
5 is held by ball bearings (not shown) provided at two positions above and below the fixed shaft 27, and is rotationally rocked by the voice coil motor 26. That is, the position of the magnetic head assembly 23 on the magnetic disk 21 is controlled by the voice coil motor 26. In FIG. 1, 28 indicates a lid.

The magnetic head assembly 2 is shown in FIG.
3 is a perspective view of the disk 3 viewed from the disk facing surface side,
FIG. 2B shows an enlarged perspective view thereof. The magnetic head assembly 23 includes a magnetic head 30 that is an element that records and reproduces information on and from the magnetic disk 21,
It is composed of a slider 31 on which the magnetic head 30 is mounted, and a flexible support member 32 for connecting a portion of the slider 31 located on the side opposite to the magnetic disk to the leaf spring 24 described above.

At the portion of the slider 31 located on the magnetic disk side, a contact portion 33 which is in sliding contact with the magnetic disk 21 during recording and reproduction is formed. A groove 35 extending in the sliding direction is formed on the sliding surface 34 of the contact portion 33.
The groove 35 divides the sliding surface 34 into two surfaces 36 and 37 that exist independently in a direction orthogonal to the sliding direction. The magnetic head 30 is built in the slider 31 so that the magnetic pole, the magnetic yoke, or the flux gather forming the magnetic pole is exposed toward the center on the downstream side in the sliding direction of the surface 37 on one side. ing.

Here, the dimensional relationship of each part will be described. In this embodiment, the sliding surface 34 of the contact portion 33 is
Are formed in 100 μm square. And this sliding surface 3
The depth of 1 μm and the width of 10
A groove 35 of μm is formed, and surfaces 36 and 37 divided by the groove 35 are formed.

The width of the groove 35 is not limited to 10 μm and may be any width satisfying the following relationship. That is, when the area of the sliding surface 34 (area when the groove 35 does not exist) is A and the opening area of the groove 35 is B, B /
A may be in the range of 0.1 to 0.8. In other words, the groove 35 with respect to the area where the contact portion 33 faces the magnetic disk 21.
It is sufficient that the ratio of the opening area of is in the range of 10 to 80%. The ratio of the opening area of the groove 35 may be set in a range exceeding 10 to 80%, which will be described later.

The magnetic head assembly 23 having the above-described structure is used for recording / reproducing on / from the magnetic disk 21.
Due to the restoring force caused by the bending of the support member 32, the magnetic disk 2
A pressing force to 1 is given.

With such a structure, when the magnetic disk 21 starts to rotate during recording and reproduction, a fluid force acts between the slider 31 and the magnetic disk 21 to cause the slider 31 to move.
The levitation force acts to lift the surface. At this time, a pressing force that exceeds the above-mentioned levitation force is applied to the slider 31 by the support member 32, and as a result, the slider 31
Keeps in contact with the magnetic disk 21 at all times.

In this embodiment, since the sliding surface 34 is divided into two surfaces 36 and 37 by the groove 35 in the direction orthogonal to the sliding direction, the slider 31 is generated as compared with the case without the groove 35. The maximum value of the levitation force can be suppressed to 1/2 or less, and the pressing force can be reduced by this ratio.

FIG. 3 shows the relationship between the contact surface pressure and the groove. As is apparent from FIG. 3, the added value of the integral values S ₁ and S ₂ of the levitation force when the groove 35 is provided is smaller than the integral value So of the levitation force when the groove 35 is not provided.

In the case of this embodiment, since the area of the sliding surface 34 is only reduced by 10% due to the presence of the groove 35, the contact surface pressure is 1/2 or less as compared with the case without the groove 35. Therefore, even if the specific wear amount (unit contact force, wear volume per unit sliding distance) of the material forming the sliding surface is constant regardless of the contact surface pressure, the wear height after sliding for a certain period of time is It becomes 1/2 or less. In many cases, the specific wear amount tends to decrease as the contact surface pressure decreases, so that the wear height is likely to be further reduced.

FIG. 4 shows the ratio of the opening area of the groove 35 to the area of the sliding surface 34 (the area without the groove), the contact portion floating force, the contact portion required load (pressing force), and the contact surface pressure. The result of analysis of the relationship is shown.

When the slider 31 is regarded as a dynamic pressure type air bearing, the load capacity of this bearing is (μ · U · b ³ ) / h
Proportional to ² . Here, μ is the viscosity coefficient of the fluid, U is the velocity, b is the bearing width, and h is a typical gap. Now, μ,
If U and h are constant, these can be set as a constant α.

(Μ · U · b ³ ) / h ² = α (constant) As can be seen from this, the surfaces 36 and 37 of the slider 31 are
The levitation force acting on is 2 × (α ·
b ³ ). The levitation force acting on one division surface is (α · b ³ ), and in the case of this example, it is two divisions,
The levitation force in the case of two divisions is twice as large as (α · b ³ ).

On the other hand, the contact part required load (pressing force) is
(2 · α · b ³ + β). Here, β is (equivalent mass of slider 31 × impact acceleration), and a constant value is selected for safety. Therefore, the contact surface pressure is (2 · α · b ³
+ Β) / 2 b, and each value changes as shown in FIG. 4 with respect to the groove area ratio.

As can be seen from FIG. 4, the groove area ratio is 10
If it is less than%, the contact portion levitation force increases, so that the contact portion required load also increases and the contact surface pressure also increases. Also,
When the groove area ratio exceeds 80%, the contact portion levitation force becomes smaller, but the contact portion required load is almost constant, so the contact surface pressure increases rapidly. Therefore, in order to sufficiently reduce the contact surface pressure and reduce wear, the groove area ratio should be set in the range of 10% to 80%. Further, from the above calculation formula, it can be seen that the larger the number of grooves is, the smaller the value of b can be with the same groove area ratio, which is advantageous in reducing the contact surface pressure. This analysis result can be applied even when h is sufficiently small.

As in the embodiment shown in FIG. 1, if the groove 35 is provided substantially along the running direction of the magnetic disk 21, the groove 35 can exert the function of guiding and removing the abrasion powder to the downstream side. Therefore, it is possible to prevent the abrasion powder from adhering and damaging the disc side.

Further, the groove 35 having a width of 10 μm and a depth of 1 μm can be easily processed by applying the exposure technique and the etching technique used in the semiconductor manufacturing, and the shape of the bearing surface of the magnetic head slider has already been applied. Such techniques are used in forming.

FIG. 5 is a perspective view of a magnetic head assembly 23a according to another embodiment of the present invention. In this figure, the same functional parts as those in FIG. 2 are indicated by the same reference numerals. Therefore, detailed description of the overlapping portions will be omitted.

In this example, the sliding surface 34 of the contact portion 33 is divided into three surfaces 41, 42, 43 in the direction orthogonal to the sliding direction by the grooves 35a, 35b, 35c extending in the sliding direction. The magnetic head 30 is formed in the slider 31a so that the magnetic pole, the magnetic yoke, or the flux gather forming the magnetic pole is exposed at the central position on the downstream side in the sliding direction of the surface 42 at the center. It is embedded. Even in this example, the groove area ratio is 10
% To 80% so that the grooves 35a, 35b, 35
c is provided.

By forming in this way, it is possible to obtain the same effect as that of the example shown in FIG. 2, and it is possible to prevent the spacing from becoming large at the initial stage of use.

That is, it is conceivable that a rolling moment is applied to the slider 31a when the slider 31a comes into contact with the magnetic disk due to a mounting error of the magnetic head assembly 23a. When the magnetic head 30 is formed in the area of the surface 41 or 43 located at both ends in the direction orthogonal to the sliding direction, one of the surfaces 41 and 43 is lifted (away from the magnetic disk) due to the rolling moment of the mounting error. ) Is possible. However, when the magnetic head 30 is formed in the area of the surface 42 located at the center as in this example, the spacing can be suppressed to about half the maximum lift amount at the air outflow end even if lift occurs. It is possible to reduce the deterioration of the signal output at the beginning of use.

FIG. 6 is a perspective view of a magnetic head assembly 23b according to another embodiment of the present invention. Note that, also in this figure, the same functional portions as those in FIG. 2 are denoted by the same reference numerals. Therefore, detailed description of the overlapping portions will be omitted.

In this example, the sliding surface 34 of the contact portion 33 has an even number, specifically six grooves 45a to 4 extending in the sliding direction.
7 faces 46-in the direction orthogonal to the sliding direction by 5f
It is divided into 52. The magnetic head 30 is formed in the slider 31b so that the magnetic pole, the magnetic yoke, or the flux gather forming the magnetic pole is exposed at the center position on the downstream side in the sliding direction of the surface 49 at the center. It is embedded. Also in this example, the grooves 45a to 45a are adjusted so that the area ratio of the grooves is in the range of 10% to 80%.
f is provided.

In this way, by forming a large number of grooves 45a to 45f, with a necessary sliding area secured,
Since the levitation force can be suppressed, the contact surface pressure can be set lower and the wear height can be made extremely small.

Therefore, even if the magnetic head 30 is used for a long period of time, the characteristic change of the magnetic head 30 can be reduced, and the magnetic head 30 can be prevented from being damaged. FIG. 7 shows the relationship between the depth of the groove provided on the sliding surface of the magnetic head assembly according to the present invention and the levitation force generated on the sliding surface, and the groove depth and contact surface when a pressing force exceeding the levitation force is applied. The relationship with pressure is shown.

The results shown in FIG. 7 show that the sliding surface is 10
In the case of a 0 μm square plane, the analysis was performed assuming that the air inlet gap was 200 nm and the air outlet gap was 10 nm, and the influence of the groove depth can be generalized within the range of normal use conditions. Further, the results shown in FIG. 7 assume that the groove width becomes larger than the groove depth due to isotropic etching.
It is the example which calculated contact surface pressure. The broken line shows the levitation force, and the solid line shows the contact surface pressure.

Whether the number of grooves is one or two, the levitation force sharply decreases as the depth of the groove increases, and the levitation force decreases to 0.1 μm.
Even if the groove is deep, the effect is about half that obtained when the groove is deep enough. When there is only one groove (division number N = 2) and when there are two grooves (division number N = 3), if both grooves are deep enough, the levitation force will be about 1/2 and 1/3, respectively. So
Even with a groove depth of 0.1 μm, the levitation force is about 3/4 and 2/3,
You can expect a considerable effect. The relationship between the groove and the levitation force can be easily understood by referring to FIG.
When the groove depth exceeds 1 μm, the change in the levitation force becomes small, and when it is 10 μm or more, it is completely saturated.

In the etching process most applicable to groove formation, the etching rate is not so high. Therefore, providing a groove with a thickness of 10 μm or more reduces productivity and, in some cases, greatly restricts the formation conditions of the magnetic head assembly, which is not preferable in manufacturing. Furthermore, in isotropic etching which can be easily adopted for many materials, the groove width tends to increase as the groove depth increases. For example, if both sides of the bottom surface of the groove are grooved up to 45 degrees, the sliding area will be narrowed due to the increase of the groove depth, and the contact surface pressure will be increased.

The contact surface pressure obtained by taking these factors into consideration and assuming that a pressing force of 1.5 times the levitation force is necessary due to other error factors is shown by the solid line in FIG. From the above, it can be said that the groove depth is preferably 0.1 μm or more and 10 μm or less.

FIG. 8 is a perspective view of a magnetic head assembly 23c according to another embodiment of the present invention. In this magnetic head assembly 23c, a slider is provided with a contact portion for contacting a magnetic disk, a magnetic pole of the magnetic head is positioned on a sliding surface of the contact portion with the magnetic disk, and the contact force of the contact portion is reduced and contact with respect to disturbance is performed. The present invention is applied to a device capable of suppressing fluctuation of force.

That is, as shown in FIG.
The magnetic disk 21 faces the magnetic disk 21 of 1c.
A contact portion 61 which makes sliding contact with the magnetic disk 21 at the time of recording / reproducing information is provided at a downstream side (air outflow side) with respect to the traveling direction 60 of the magnetic field, and a magnetic field is provided at an upstream side (air inflow side). A levitation force receiving portion 62 having a taper flat shape is provided to generate a dynamic pressure between the disc 21 and the disc 21 and receive the dynamic pressure as a levitation force.

As can be seen from the above structure, in this magnetic head assembly 23c, the distance Lh from the contact portion 61 to the levitation force acting position 63 is increased, and the distance Lh and the contact portion 61 to the pressing load application position 64 are increased. By reducing the difference from the distance Lp, the moment that tries to increase the slider pitch angle due to the levitation force fh received by the levitation force receiving portion 62 during disk rotation and the pitch due to the pressing force applied to the slider via the support member 32. The contact force fc that acts on the contact portion 61 by balancing the moment for reducing the angle and the moment for reducing the pitch angle due to the contact force and frictional force generated on the sliding surface 65.
Is suppressed to a small value and the fluctuation is small.

In addition to the above configuration, in this example, the contact portion 61
Is provided with two grooves 66, 67 extending in the sliding direction, and the grooves 66, 67 make the sliding surface 65 into three surfaces 68, 69, 70 in a direction orthogonal to the sliding direction. It is divided. Also in this example, the grooves 66 and 67 are provided so that the area ratio of the groove portions is in the range of 10% to 80%. The magnetic head 30 is built in the slider 31c so that the magnetic poles are exposed on the surface 69 located at the center.

In the above-mentioned example, in the case of the entire surface contact, the groove 6 has a groove area ratio of 10% to 80%.
Although 6 and 67 are provided, the contact force fc is small when the contact portion is made only in the rear, so the groove area ratio is wider than the range of 10% to 80%, that is, 5% to 900%.
I think there is no problem even within the range.

If the sliding surface 65 has no groove, a floating force other than the contact force acts on the sliding surface, and if this changes due to the change in the attitude of the slider 31c, the contact force also changes. When this fluctuation is significant, a stable contact state cannot be maintained and the spacing fluctuates. On the other hand, when the area of the sliding surface is reduced so as not to generate the levitation force, the contact portion is rapidly worn and the characteristics of the magnetic head 30 are easily changed or deteriorated or damaged.

However, by providing the grooves 66 and 67 in the sliding surface 65 as in this example, the influence of the levitation force can be remarkably suppressed, so that the contact force fc can be made smaller and the structure can be stabilized against disturbance. It is possible to effectively exhibit the characteristics of and to obtain stable characteristics.

In each of the above-mentioned examples, a groove extending in the sliding direction is provided on the sliding surface of the contact portion provided on the slider,
Although these grooves divide the sliding surface into a plurality of surfaces in the direction orthogonal to the sliding direction, the method of providing such grooves is not limited.

For example, as shown in FIG.
On the sliding surface 71 of the contact portion, the running direction 72 of the magnetic disk and the grooves 73 extending in a lattice shape in the direction orthogonal to the running direction.
May be provided, and the groove 73 may divide the sliding surface 71 into a plurality of parts. Further, as shown in FIG. 10B, a groove 74 extending parallel to a direction orthogonal to the running direction 72 of the magnetic disk.
A plurality of grooves may be provided, and the groove 74 may divide the sliding surface 71 into a plurality of parts. Further, as shown in (c) of FIG. 10, grooves 75 extending in a lattice at an angle with respect to the traveling direction 72 of the magnetic disk are provided, and the grooves 75 divide the sliding surface 71 into a plurality of parts. Good.

In any case, the groove area ratio is 10
It is necessary to provide the groove so that the range is 80% to 80%. Further, in each of the drawings, reference numeral 76 indicates the exposed position of the magnetic pole in the magnetic head. The exposed position of the magnetic poles in the magnetic head is preferably near the air outflow portion and near the center in the width direction.

The groove formed on the sliding surface of the slider is formed by mechanical processing and etching processing using photolithography. However, the shape of the groove is not limited to a linear shape, but an arbitrary shape. Can be selected. That is, the basic concept of the present invention is to suppress the levitation force generated on the sliding surface by forming a groove on the sliding surface of the contact portion of the slider, thereby lowering the contact surface pressure and increasing the wear height. The shape of the groove may be any shape as long as it can be reduced.

FIG. 11 is a perspective view of the magnetic head assembly 123 in the magnetic disk device according to the embodiment of the present invention as viewed from the disk facing surface side. The magnetic head assembly 123 is a magnetic head 130 that is an element that records and reproduces information on and from the magnetic disk 21.
And a slider 31 on which the magnetic head 130 is mounted,
A portion of the slider 31 located on the side opposite to the magnetic disk is connected to the above-mentioned leaf spring 124 and the slider 31
And a gimbal suspension 132 as a load applying means for applying a necessary pressing force in the magnetic disk direction.

On the surface of the slider 131 located on the magnetic disk side, a protruding portion 133 is formed which protrudes in a T-shape toward the magnetic disk side. This protrusion 133 is T
A portion 134 corresponding to a so-called horizontal bar of the character is located on the upstream side with respect to the traveling direction of the magnetic disk 121, and a portion 135 corresponding to a so-called vertical bar of the T-shape extends from the portion 134 toward the downstream side. .

The portion 134 is formed in a taper flat shape, and when the magnetic disk 121 is rotating, a dynamic pressure is generated between the portion 134 and the magnetic disk 121 due to a fluid force. A dynamic pressure generating unit 136 that floats up the side is configured.

In the case of this example, the dynamic pressure generating portion 136 has the groove 1
It is composed of two dynamic pressure generating portions 136a and 136b divided by 37 into asymmetrical sizes in the width direction of the slider 131. Due to this divisional structure, the dynamic pressure generating unit 136 is placed between the magnetic disk 121 and the slider 131.
Non-uniform dynamic pressure is generated in the width direction of. That is, in this example, the dynamic pressure generated in the dynamic pressure generating section 136b is made smaller than the dynamic pressure generated in the dynamic pressure generating section 136a, and this pressure difference makes it possible to compare the flying height on the dynamic pressure generating section 136a side. The flying height on the dynamic pressure generating portion 136b side is reduced, and the rolling force is forcibly applied to the slider 131 by this height difference.

On the other hand, the downstream portion of the portion 135 of the protruding portion 133 is defined as a contact portion 138 which comes into contact with the magnetic disk 121 during recording / reproducing of information. The magnetic head 130 is built in the slider 131 so that the magnetic pole, the magnetic yoke, or the flux gather that constitutes the magnetic pole 139 is exposed on the sliding surface 140 of the contact portion 138. In the case of this example, the magnetic pole 139 is exposed at a position deviated from the center position of the contact portion 138 in the width direction toward the dynamic pressure generating portion 136b.

In this magnetic head assembly 123, as shown in FIG. 13, a gimbal suspension 132, which is a load applying means, is provided near the extension line of the action point 142 of the levitation force fh applied by the dynamic pressure generating section 36. Slider 1
An application position 143 of the pressing load F applied to 31 and a center of gravity position 144 determined from the equivalent mass including the load applying means are located. That is, this magnetic head assembly 1
23, the distance L from the contact portion 138 to the point of action 142
h is increased, and the difference between the distance Lh and the distance Lp from the contact portion 138 to the pressing load application position 143 is reduced. As a result, the moment that the slider pitch angle is increased by the flying force fh when the disk rotates,
Slider 13 via gimbal suspension 132
The contact force acting on the contact portion 138 by balancing the moment for reducing the pitch angle due to the pressing force applied to 1 and the moment for reducing the pitch angle due to the contact force and the friction force generated on the sliding surface 140. The force fc is suppressed to a small value and the fluctuation is reduced. Further, by locating the center of gravity position 144 in the above relationship, the fluctuation of the contact force fc when applying a disturbance is suppressed.

With such a structure, the magnetic disk 1
When the slider 21 rotates, the slider 131 moves the sliding surface 140 of the contact portion 138 located on the downstream side, as shown in FIG.
Comes into contact with the magnetic disk 121, and the upstream side is in a floating posture.

In this case, in the dynamic pressure generating section 136, the dynamic pressure generating section 136 is compared with the dynamic pressure generated in the dynamic pressure generating section 136a.
The dynamic pressure generated in b is small. Therefore, the dynamic pressure generator 13
The flying height on the dynamic pressure generating portion 136b side is lower than the flying height on the 6a side. Due to this height difference, the slider 131
12 is forcibly applied with a rolling force exceeding the rolling force due to a manufacturing error or an assembly error in the direction indicated by a solid arrow 151 in FIG. By this rolling force, the dynamic pressure generating portion 1 on the sliding surface 140 of the contact portion 138 is generated.
The portion located on the 36b side is in a state of being forcedly contacted with the magnetic disk 121. Since the magnetic pole 139 of the magnetic head 130 is exposed at this portion, in the end,
The magnetic pole 139 is automatically held in sliding contact with the magnetic disk 121.

As described above, the contact portion 1 is provided at the downstream position of the slider 131 with reference to the traveling direction of the magnetic disk 121.
38 is provided, and a dynamic pressure generating portion 136 is provided at an upstream side position of the slider 131 so as to generate a non-uniform dynamic pressure in the width direction of the slider 131 between the slider 131 and the magnetic disk 121 and float the upstream side of the slider 131. This dynamic pressure generator 136
The rolling force is applied to the slider 131 by utilizing the non-uniform dynamic pressure in the width direction to force the specific portion of the contact portion 138 to come into contact with the magnetic disk 121. Further, the magnetic pole 139 of the magnetic head 130 is provided in a fixed positional relationship with respect to the specific portion.

Therefore, the gimbal suspension 1
Even if 32 or the like includes a manufacturing error or a mounting error, it is possible to automatically set the magnetic pole 139 of the magnetic head 130 to a certain relational position with respect to the magnetic disk 121 without performing wear treatment on the slider. In addition, it is possible to contribute to the improvement of reliability and the cost reduction of the magnetic head assembly 123.

FIG. 14 is a perspective view of a magnetic head assembly 123a according to another embodiment of the present invention.
In this figure, the same functional parts as those in FIG. 11 are designated by the same reference numerals. Therefore, detailed description of the overlapping portions will be omitted.

In this magnetic head assembly 123a,
The grooves 137a to 137c divide the dynamic pressure generating portion 136 into four dynamic pressure generating portions 136a to 136d, and the slider 131a is adjusted by adjusting the widths of the dynamic pressure generating portions 136a to 136d.
It determines the rolling power to give.

Even with this structure, the same effect as that of FIG. 11 can be obtained. FIG. 15 is a perspective view of a magnetic head assembly 123b according to still another embodiment of the present invention. Note that, also in this figure, the same functional portions as those in FIG. 11 are denoted by the same reference numerals. Therefore,
A detailed description of the overlapping part will be omitted.

In this magnetic head assembly 123b,
The gimbal suspension 132 as a load applying means for supporting the slider 131b and applying a pressing force in the magnetic disk direction to the slider 131b is not previously applied to the slider 131b by the dynamic pressure generated by the dynamic pressure generating unit 136. Small deformation (deformation part 200)
Is added to generate a rolling moment in the slider 131b. Then, the magnetic pole 13 of the magnetic head 130 is located at a fixed position on the sliding surface 140 of the contact portion 138 with respect to the portion forcibly brought into contact with the magnetic disk by the rolling moment.
9 is located.

Even with this structure, the same effect as the magnetic head assembly described above can be obtained. FIG.
FIG. 11 shows a rear view of a magnetic head assembly 123c according to another embodiment of the present invention. Note that, also in this figure, the same functional portions as those in FIG. 11 are denoted by the same reference numerals. Therefore, detailed description of the overlapping portions will be omitted.

In this magnetic head assembly 123c,
A plate for mounting the gimbal suspension 132a as a load applying means for supporting the slider 131c and applying a pressing force in the magnetic disk direction to the slider 131c, instead of applying a rolling force to the slider 131c by the dynamic pressure generated in the dynamic pressure generating portion. Spring or arm 125
The mounting surface of is inclined with respect to the magnetic disk 121. This makes the gimbal suspension 132
A rolling moment is generated in the slider 131c via the spring rigidity of a. Then, the magnetic pole 139 of the magnetic head 130 is positioned at a certain relational position with respect to the portion that is forced to contact the magnetic disk 121 by the rolling moment on the sliding surface 140 of the contact portion 138.

Even with this structure, the same effect as that of the magnetic head assembly described above can be obtained. FIG.
FIG. 9 is a perspective view of a magnetic head assembly 123c according to another embodiment of the present invention. Note that, also in this figure, the same functional portions as those in FIG. 11 are denoted by the same reference numerals.
Therefore, detailed description of the overlapping portions will be omitted.

In this magnetic head assembly 123d,
A slider of the gimbal suspension 132 as a load applying means for supporting the slider 131d and applying a pressing force in the magnetic disk direction to the slider 131d, instead of applying a rolling force to the slider 131d by the dynamic pressure generated by the dynamic pressure generating unit 136. The support point position is shifted from the center in the width direction. As a result, the slider 131d
It is designed to generate a rolling moment.
Note that reference numeral 201 in FIG. 17 indicates a shift in the slider support point position. Then, the magnetic pole 139 of the magnetic head 130 is located at a fixed position on the sliding surface 140 of the contact portion 138 with respect to the portion that is forcibly brought into contact with the magnetic disk by the rolling moment.

With this structure, the same effect as that of the above-described magnetic head assembly can be obtained. FIG.
FIG. 9 is a perspective view of a magnetic head assembly 123e according to yet another embodiment of the present invention. Note that, also in this figure, the same functional portions as those in FIG. 11 are denoted by the same reference numerals. Therefore, detailed description of the overlapping portions will be omitted.

In this magnetic head assembly 123e,
The dynamic pressure generating portion 136 and the contact portion 138a are provided in an independent state. Then, the dynamic pressure generating unit 136 is provided with the groove 12
It is composed of two dynamic pressure generating portions divided by 7 into asymmetrical sizes in the width direction of the slider 131e. With this divisional structure, the dynamic pressure generating unit 136 generates a non-uniform dynamic pressure in the width direction of the slider 131e between itself and the magnetic disk, and applies a rolling force to the slider 131e.

On the other hand, the contact portion 138a is divided into three by a groove whose sliding surface 140a with the magnetic disk extends in the sliding direction. Dividing in this way is the sliding surface 14
This is because the levitation force generated on the sliding surface 140a is suppressed to a small value and the surface pressure on the sliding surface 140a is suppressed without significantly reducing the area of 0a.

Then, the sliding surface 1 at the contact portion 138a
At 40a, the magnetic pole 139 of the magnetic head 130 is positioned at a certain relational position with respect to the portion that is forcibly brought into contact with the magnetic disk by the rolling moment.

Even with this structure, the same effect as that of the magnetic head assembly described above can be obtained. In addition,
Each of the above-mentioned examples is an example in which an inductive head is mounted as a magnetic head. However, when a head incorporating an element such as a magnetoresistive effect element (MR element) that does not invade sliding heat is used as the magnetic head, For example, it is conceivable to incorporate a magnetic pole in advance at a position distant from a specific portion which is forcibly brought into contact with the magnetic disk by a rolling moment on the sliding surface of the contact portion.

Also in the examples shown in FIGS. 14 to 18, it is needless to say that the relationship between the levitation force acting position, the load applying position and the center of gravity position described with reference to FIG. 13 can be applied. Next, another embodiment of the contact portion of the magnetic head will be described with reference to FIGS. That is, FIG.
In the semi-floating contact type magnetic head 300 having the flying portion and the contact portion 301 shown in FIG. 9, a pitching angle is generated in the attitude of the slider as the flying portion flies during operation. The recording / reproducing unit 302 is provided at a position slightly retracted from the end of the contact unit 301. This is due to the thickness of the protective film for protecting the recording / reproducing unit 302 formed by the thin film process.

In the above structure, as shown in FIG. 19, there is a gap between the recording / reproducing section 302 and the disc even when the end portions of the contact portions are in contact with each other. In addition, a roll angle may occur in the slider posture due to a suspension mounting error or the like. In this case, in addition to the above-described gap due to the pitching angle, a gap determined by the roll angle and the width of the rear end of the contact portion is generated, which makes it difficult to keep the gap between the recording / reproducing portion 302 and the disc small. .

On the other hand, in the contact recording method, it is necessary to suppress the wear depth of the contact surface as much as possible and to prolong the service life. For that purpose, it is preferable to increase the area of the contact surface. Particularly, in the semi-floating contact method, since the slider is in a pitching posture, it is advantageous to increase the contact area in the width direction.

In order to meet the above requirements, in the present invention, the contact portion 301 has a shape in which the outflow end portion 301A is thin and widens toward the inflow portion side (wide portion 301).
B). In this way, even if a roll angle occurs, it is possible to minimize the increase in the gap resulting from it, and at the same time, since the contact part with a sufficient width is provided, the wear depth is also suppressed. it can.

For example, as shown in FIG. 20 (a), in the case of a triangular contact portion 310, if only a pitching angle occurs, the contact point becomes the apex of the triangle and the gap is Lp · θp. Become. Further, when the roll angle θr is generated in addition to the pitching angle θp, the steepest gradient direction is the direction shown in FIG. 21 due to the geometrical relationship, and the inclination of the contact surface is θ. Reference numeral 311 is a recording / reproducing unit.

At this time, the shape of the contact surface is shown in FIG.
The angle between the apexes, as shown in the 2 [Theta] ^*, the contact portion 310 in a triangular shape with a rolling angle + [theta] r or -θr
In this case, as shown in FIG. 21, the disk comes into contact with the oblique side of the contact surface.
The gap with the disk at 2 is the same as when contacted at the triangular vertex with a roll angle of zero. The roll angle is θr
If it is smaller than this, the contact point becomes a triangular vertex, and the gap in the recording / reproducing section becomes smaller. That is, within the range of the roll angle ± θr, the contact portion is located at the apex of the triangle and the gap of the recording / reproducing portion has a constant value. On the other hand, when the roll angle is out of the range of ± θr, the gap increases (FIG. 22).

Therefore, it is possible to secure a sufficient area and prevent the gap between the recording / reproducing section and the disk from increasing even if the roll angle occurs. When it is desired to suppress the fluid force generated at the contact portion, it is possible to use the contact portion 330 in which the above-mentioned triangular surface is divided by the groove 331, as shown in FIG. Reference numeral 332 is a recording / reproducing unit.

When the vertices of the triangle are problematic in terms of impact resistance, it is possible to use the contact portion 320 with chamfered vertices as shown in FIG. Reference numeral 321 indicates chamfering, and reference numeral 322 is a recording / reproducing unit.

For the same reason, as shown in FIG. 20 (d), the contact portion 340 may have an arcuate edge. Reference numeral 341 indicates chamfering, and reference numeral 342 is a recording / reproducing unit.

[0098]

As described above, according to the present invention,
The levitation force generated on the sliding surface can be reduced without reducing the area of the sliding surface in the slider, which reduces the pressing force applied to the slider and reduces the wear height of the contact part. It is possible to remarkably reduce characteristic changes due to wear of the magnetic pole, the magnetic yoke, and the flux gather, which are part of the magnetic head. As a result, the reliability of the magnetic head assembly can be improved.

As a result, the recording density can be remarkably increased while maintaining the high reliability of the magnetic head, and a high-density and high-reliability magnetic disk device can be provided. Further, according to the present invention, even if there is a manufacturing error or an assembling error, the relative position between the magnetic pole of the magnetic head and the magnetic disk is automatically set to the optimum state without subjecting the slider to abrasion after assembly. Therefore, it is possible to provide an inexpensive and highly reliable magnetic head assembly and a highly reliable magnetic disk device capable of high density recording using the magnetic head assembly.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a magnetic disk device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a magnetic head assembly incorporated in the apparatus.

FIG. 3 is a diagram showing a relationship between a groove and a levitation force.

FIG. 4 is a diagram showing a relationship between an area ratio of a groove formed on a sliding surface of the magnetic head assembly and a contact surface pressure characteristic.

FIG. 5 is a perspective view showing another example of the magnetic head assembly.

FIG. 6 is a perspective view showing still another example of a magnetic head assembly.

FIG. 7 is a diagram showing a relationship between groove depth and contact surface pressure characteristics.

FIG. 8 is a perspective view showing still another example of the magnetic head assembly.

FIG. 9 is a diagram illustrating a posture of the magnetic head assembly during recording and reproduction.

FIG. 10 is a diagram showing different forms of grooves provided on a sliding surface.

FIG. 11 is a perspective view of a magnetic head assembly incorporated in the apparatus.

FIG. 12 is a view for explaining the operation of the magnetic head assembly.

FIG. 13 is a view for explaining the operation of the magnetic head assembly.

FIG. 14 is a perspective view of a magnetic head assembly according to another embodiment of the present invention.

FIG. 15 is a perspective view of a magnetic head assembly according to still another embodiment of the present invention.

FIG. 16 is a rear view of a magnetic head assembly according to another embodiment of the present invention.

FIG. 17 is a perspective view of a magnetic head assembly according to another embodiment of the present invention.

FIG. 18 is a perspective view of a magnetic head assembly according to still another embodiment of the present invention.

FIG. 19 is a perspective view of a magnetic head assembly according to still another embodiment of the present invention.

FIG. 20 is a plan view showing a modified example of the magnetic head.

FIG. 21 is a diagram showing a relationship between the shape of a contact portion and a pitching angle, a roll angle, or the like.

FIG. 22 is a characteristic diagram showing a relationship between a roll angle and a gap.

FIG. 23 is a perspective view showing a conventional magnetic head assembly.

FIG. 24 is a view showing a posture of a conventional magnetic head assembly at the time of recording / reproducing.

FIG. 25 is a diagram for explaining the reason why the width of the slider is limited.

FIG. 26 is a diagram for explaining analysis conditions.

FIG. 27 is a diagram showing the relationship between the clearance of the air inflow portion and the levitation force obtained by analysis.

FIG. 28 is a view for explaining a problem of the conventional magnetic head assembly.

[Explanation of symbols]

21 ... Magnetic disk 22 ... Spindle 23, 23a, 23b, 23c ... Magnetic head assembly 24 ... Leaf spring 25 ... Arm 26 ... Voice coil motor 30 ... Magnetic head 31, 31a, 31b, 31c ... Slider 32 ... Support material 33, 62 ... Contact portion 34, 63, 65, 71 ... Sliding surface 35, 35a, 35b, 45a to 45f, 66, 67,
73, 74, 75 ... Grooves 41-43, 47-52, 68-
70 ... A surface divided by a groove

Claims (19)

[Claims] 1. A magnetic head assembly in which a slider is equipped with a magnetic head for recording / reproducing information on / from a rotationally driven rigid magnetic disk, wherein the slider is the magnetic disk during recording / reproducing information. A contact portion that makes sliding contact with respect to the contact surface, the sliding surface of the contact portion is divided into a plurality of surfaces by a groove, and the groove has an area ratio of the magnetic disk and the groove of 10 to 80%. The magnetic head has a magnetic pole, and the magnetic pole is arranged on any one of the divided surfaces of the sliding surface divided by the groove. Magnetic head assembly. 2. The magnetic head assembly according to claim 1, wherein two or more grooves are provided in a direction that extends in the sliding direction of the contact portion and is orthogonal to the sliding direction. 3. The even number of grooves are provided in a direction extending in the sliding direction of the contact portion and orthogonal to the sliding direction,
3. The magnetic head assembly according to claim 1, wherein the magnetic head has a magnetic pole located on a dividing surface located at the center of the dividing surfaces divided by the grooves. 4. The magnetic head assembly according to claim 1, wherein the depth of the groove is in the range of 0.1 μm to 10 μm. 5. A magnetic head for recording / reproducing information on / from a rigidly rotated magnetic disk, a slider equipped with this magnetic head, and a pressing load applied to the slider toward the magnetic disk. The slider is provided with a contact portion for sliding contact with the magnetic disk at the time of recording / reproducing information on the downstream side with respect to the traveling direction of the magnetic disk, and the slider is provided on the upstream side. A magnetic head including a levitation force receiving portion that receives a dynamic pressure generated between the magnetic disk and the magnetic disk as a levitation force, and a load applying position of the load applying means is located near a levitation force acting position of the levitation force receiving portion. In the assembly, the slider includes a contact portion that makes sliding contact with the magnetic disk when information is recorded / reproduced, and a sliding surface of the contact portion is formed by a groove. A plurality of surfaces, the groove is formed on the sliding surface so that the area ratio of the magnetic disk and the groove is in the range of 10 to 80%, the magnetic head has a magnetic pole, and the magnetic pole Is arranged on any one of the sliding surfaces divided by the groove into a plurality of sliding surfaces. 6. The magnetic head assembly according to claim 5, wherein two or more grooves are provided in a direction that extends in the sliding direction of the contact portion and is orthogonal to the sliding direction. 7. The even number of grooves are provided in a direction extending in the sliding direction of the contact portion and orthogonal to the sliding direction,
7. The magnetic head assembly according to claim 5, wherein the magnetic head has a magnetic pole located on a dividing surface located at the center of the dividing surfaces divided by the grooves. 8. The magnetic head assembly according to claim 5, wherein the depth of the groove is in the range of 0.1 μm to 10 μm. 9. A magnetic disk having a rigid structure, a means for rotationally driving the magnetic disk, a magnetic head assembly having a slider on which a magnetic head for recording and reproducing information on the magnetic disk is mounted, and a magnetic head assembly for the magnetic disk. A magnetic disk device comprising: a means for controlling the position of a head assembly on the magnetic disk, wherein the slider includes a contact portion that is in sliding contact with the magnetic disk when recording and reproducing information. The sliding surface of the portion is divided into a plurality of surfaces by the groove, and the area ratio of the groove to the area of the contact portion facing the magnetic disk is 10
The magnetic disk device is characterized in that the magnetic head has a magnetic pole positioned on any one of the divided surfaces of the sliding surface divided by the groove. 10. A magnetic disk having a rigid structure, a means for rotating and driving the magnetic disk, a magnetic head for recording / reproducing information on / from the magnetic disk, a slider equipped with the magnetic head, and the magnetic for the slider. A magnetic head assembly including load applying means for applying a pressing load toward the disk; and means for controlling the position of the magnetic head assembly on the magnetic disk.
The slider is provided with a contact portion on the downstream side with respect to the traveling direction of the magnetic disk, which is in sliding contact with the magnetic disk at the time of recording / reproducing information, and a dynamic pressure generated between the slider and the magnetic disk on the upstream side. A levitation force receiving portion for receiving the levitation force as a levitation force, and a load applying position by the load applying means is located near a levitation force acting position of the levitation force receiving portion, and the magnetic head is the magnetic disk of the contact portion. A magnetic disk device in which magnetic poles are located on a sliding surface of the slider, wherein the slider has a sliding surface that is in sliding contact with the magnetic disk and is divided into a plurality of surfaces by grooves. The area ratio of the groove to the area facing the magnetic disk of the part is set in the range of 10 to 80%, the magnetic head, the sliding surface divided into a plurality of by the groove Magnetic disk device, characterized in that it is positioned pole to one of the divided surfaces. 11. A magnetic head assembly comprising a slider, and a magnetic head having magnetic poles for recording / reproducing information on / from a rigidly-structured magnetic disk that is rotationally driven, the slider comprising: A contact portion having a sliding surface that slides with respect to the magnetic disk is provided on the downstream side in the rotation direction of the magnetic disk, and the slider uses dynamic pressure generated between the slider and the magnetic disk on the upstream side as a levitation force. The slider is provided with a levitation force receiving portion, and further, in the slider, a groove portion that divides the sliding surface into a plurality of divided surfaces is formed in a downstream side portion, and the magnetic head has a plurality of divided surfaces. A magnetic head assembly in which the magnetic poles are arranged. 12. A magnetic head having a magnetic pole for recording / reproducing information on / from a rigidly-structured magnetic disk which is rotationally driven, a slider having the magnetic head mounted thereon, and a slider which faces the magnetic disk. A magnetic head assembly comprising: a load applying unit that applies a pressing load, wherein the slider includes a contact portion that is in sliding contact with the magnetic disk on a downstream side in a rotation direction of the magnetic disk,
Further, the slider is provided with a levitation force receiving portion on the upstream side for receiving a dynamic pressure generated between the slider and the magnetic disk as a levitation force, and a distance Lh from the contact portion to a levitation force acting position by the levitation force receiving portion. With respect to the distance Lp from the contact portion to the load applying position, the Lh is set to be large and Lh-Lp is set to a predetermined value or less, and the magnetic head has the magnetic poles arranged in the contact portion. A magnetic head assembly characterized by the above. 13. A magnetic head for recording / reproducing information on / from a rotationally driven rigid magnetic disk, a slider having the magnetic head mounted thereon, and a load application for applying a pressing force in the magnetic disk direction to the slider. Means, a contact portion provided on the slider for slidingly contacting the magnetic disk at the time of recording / reproducing information, and a rolling moment acting on the slider at least at the time of recording / reproducing information to cause a specific portion of the contact portion to move. A magnetic head assembly comprising: a rolling force applying means for slidingly contacting a magnetic disk, wherein magnetic poles of the magnetic head are provided in a fixed positional relationship with respect to the specific portion of the contact portion. Characteristic magnetic head assembly. 14. The magnetic head according to claim 13, wherein the rolling force applying means is constituted by the load applying means for applying the pressing force to a position deviated from the center of the slider in the width direction. assembly. 15. The magnetic head assembly according to claim 13, wherein the rolling force applying means is constituted by the load applying means for applying the pressing force accompanied by the rolling force to the slider. . 16. The contact portion is provided at a position downstream of the slider with respect to the traveling direction of the magnetic disk, and the rolling force applying means is provided at a position upstream of the slider. 14. The magnetic head assembly according to claim 13, further comprising: a dynamic pressure generating section that generates a non-uniform dynamic pressure in the width direction of the slider between the magnetic head and the slider to float the upstream side of the slider. . 17. A magnetic disk having a rigid structure, means for rotationally driving the magnetic disk, a magnetic head for recording and reproducing information on the magnetic disk, a slider equipped with the magnetic head, and the magnetic disk for the slider. A magnetic disk device comprising: a magnetic head assembly including a load applying means for applying a pressing force in a disk direction; and a means for controlling the position of the magnetic head assembly on the magnetic disk, the magnetic disk device being provided on the slider. A contact portion that makes sliding contact with the magnetic disk when recording or reproducing information, and a rolling force that causes a sliding moment to act on the slider at least when recording or reproducing information to cause a specific portion of the contact portion to make sliding contact with the magnetic disk. Providing means, and a predetermined relationship with the specific portion of the contact portion. Pole of the magnetic head is provided. A magnetic recording medium having a conductive recording layer is provided with a probe made of a ferromagnetic film with its tip facing so as to be movable relative to the magnetic recording medium, and a direct current is provided between the probe and the recording layer. A signal is recorded on the magnetic recording medium by applying a voltage to cause a tunnel current to flow between the tip of the probe and the magnetic recording medium and detecting a change in the tunnel current. And a signal reproducing method in a magnetic recording / reproducing apparatus. 18. A magnetic head for recording / reproducing information on / from a rigidly-rotated magnetic disk, a slider having the magnetic head mounted thereon, and a load for applying a pressing force to the slider in the magnetic disk direction. A magnetic head assembly comprising: means, and a contact portion provided on the slider for slidingly contacting the magnetic disk at the time of recording and reproducing information, wherein the contact leaf and the outflow end are thin and on the inflow side. A magnetic head assembly having a shape that widens toward the side. 19. The magnetic head assembly according to claim 17, wherein the contact portion has a substantially triangular shape.