JP2008293568A - Magnetic head device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic head device set in a floating attitude by an air flow formed in its surface during movement of a recording medium, and capable of stabilizing the floating amount of a magnetic function unit by stabilizing the floating attitude of a slider even when a change occurs in the air density of a used environment. <P>SOLUTION: On the side of the slider 10 of the magnetic head device facing a recording medium D, a front positive pressure surface 21 is formed before the application support point 7a of a pressing force, and an intermediate positive pressure surface 41 is formed after the application support point 7a in the intermediate part thereof. The intermediate positive pressure surface 41 is in a position protruded to the recording medium D side more than the front and rear positive pressure surfaces 21 and 31. When an air density is reduced, floating pressure applied on the front positive pressure surface 21 is reduced to lower a pick angle θp. However, the reduction of the magnetic function part 2 for bringing the intermediate positive pressure surface 41 close to the recording medium D to generate positive pressure is suppressed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a magnetic head device in which a magnetic function unit is provided on a slider facing a magnetic recording medium such as a hard disk, and in particular, when the air density in a use environment changes, the flying distance from the recording medium varies. The present invention relates to a magnetic head device that can be suppressed.

  As a magnetic head device for recording a magnetic signal on a magnetic recording medium such as a hard disk and reading the magnetic signal recorded on the magnetic recording medium, the magnetic head device has a slider facing the magnetic recording medium, and the trailing side end of the slider A device provided with a magnetic function part is used. The magnetic function part has a reproducing function part using the MR effect, GMR effect or TMR effect, and a recording function part in which a yoke, a coil, etc. of a magnetic material are formed in a thin film.

  The slider of the magnetic head device is pressed against the surface of the magnetic recording medium by an elastic member called a load beam. When the magnetic recording medium rotates, the slider is lifted from the recording medium by an air flow (air bearing) flowing between the surface and the slider, and as a result, a predetermined flying height is generated between the magnetic function unit and the recording medium. Is set.

  In this type of magnetic head device, a positive pressure surface that generates a flying pressure by an air flow and a negative pressure generation surface that exerts a force approaching the recording medium are formed on the side of the slider facing the recording medium. The flying posture and the flying height of the slider are set by the balance between the flying force acting on the positive pressure surface and the descending force generated on the negative pressure generating surface.

  In order to increase the magnetic recording density on the magnetic recording medium and increase the recording speed and reproducing speed of the magnetic signal, recently, the flying height of the magnetic function unit from the recording medium is minimized. Is set.

  Japanese Patent Application Laid-Open No. H10-228667 describes a variation in the flying height during a seek operation in which the flying height from a recording medium such as a hard disk is reduced and the magnetic head is moved between the inner circumference side and the outer circumference side of the recording medium. A magnetic head device aimed at stabilizing and particularly suppressing fluctuations in yaw angle is disclosed.

  In this magnetic head device, the slider is provided with a front dynamic pressure generating portion and a rear dynamic pressure generating portion, a levitation force is applied to the front dynamic pressure generating portion, a negative pressure is generated in the rear dynamic pressure generating portion, and an intermediate A deep dent that does not generate any levitation force and does not generate negative pressure is formed on the head, and the dynamic posture of the head is mainly controlled by the levitation force of the front dynamic pressure generator and the negative pressure of the rear dynamic pressure generator. It is to stabilize.

  In recent magnetic head devices, fluctuations in the flying height due to changes in air density have become a problem with the low flying height of the slider. If the flying height of the slider with respect to the magnetic recording medium is reduced, the flying height tends to decrease as the air density decreases due to the altitude difference. As a result, when using the projector at high altitudes or in an aircraft. In addition, the slider easily comes into contact with the surface of the recording medium.

  The magnetic head device described in Patent Document 1 attempts to stabilize the dynamic posture of the magnetic head by applying a levitation force to the front dynamic pressure generating unit and applying a negative pressure to the rear dynamic pressure generating unit. Since the negative pressure generating surface that generates pressure is provided only at the trailing end of the slider, the entire slider is easy to approach the recording medium when the air density in the operating environment decreases, The amount may be extremely reduced.

  Next, in the magnetic head device described in Patent Document 2, a front positive pressure surface and a rear positive pressure surface are formed to protrude on the side of the slider facing the recording medium. An action point for applying a load toward the recording medium is set at a position facing the upper side of the front positive pressure surface. In this magnetic head device, when the positive pressure acting on the front positive pressure surface and the rear positive pressure surface is reduced, a moment for lowering the leading side acts on the slider, so that the trailing side end provided with a reproducing element or the like is provided. The amount of decrease in the portion is suppressed.

However, when a pressing force in the direction of the recording medium acts on the front positive pressure surface, it is used in high altitudes, airplanes, etc., and when the air density decreases and the positive pressure acting on the front pressure surface decreases In addition, the flying height of the entire slider is drastically reduced, and it is not considered that the flying height at the trailing end can be sufficiently suppressed.
JP-A-10-283622 Japanese Patent Laying-Open No. 2005-302144

  The present invention solves the above-described conventional problems, and realizes a low flying height from the recording medium of the magnetic function unit, and can suppress the fluctuation of the flying height when the air density in the use environment changes. An object is to provide a head device.

The present invention provides a slider having a side facing a recording medium and a pressing side on which a pressing force acts on the recording medium, and a function of at least one of magnetic recording and magnetic reproduction provided on the trailing side of the slider In a magnetic head device having a magnetic function unit that exhibits
On the opposite side of the slider, a front pressure surface located on the leading side, a rear pressure surface located on the trailing side, and an intermediate pressure surface located between the front pressure surface and the rear pressure surface are formed. The intermediate positive pressure surface is formed at a position protruding to the recording medium side with respect to the rear positive pressure surface.

  In the magnetic head device of the present invention, the front pressure surface and the rear pressure surface are formed on the side of the slider facing the recording medium, and the area of the front pressure surface is usually larger than the area of the rear pressure surface. Accordingly, when air flows from the leading side to the trailing side, the slider assumes an inclined posture in which the leading side is farther from the recording medium than the trailing side. When the air density in the usage environment decreases, the positive pressure acting on the front positive pressure surface and the positive pressure acting on the rear positive pressure surface decrease, and the flying height of the entire slider tends to decrease. At this time, the intermediate pressure surface approaches the recording medium, but since the intermediate pressure surface protrudes toward the recording medium, the positive pressure acting on the intermediate pressure surface is greatly reduced when the flying height of the slider decreases. do not do. Therefore, even if the pitch angle of the slider decreases, it is possible to suppress a decrease in the flying distance at the trailing side end.

  In the present invention, it is preferable that the intermediate positive pressure surface is located on the left and right sides with a center line extending from the leading side to the trailing side of the slider. By disposing the intermediate positive pressure surface away from the left and right, the roll posture of the slider can be stabilized.

  Further, according to the present invention, the support mechanism for supporting the slider is provided with an action fulcrum for applying a pressing force toward the recording medium at one place on the pressing side of the slider, It is preferable to be located on the trailing side with respect to the working fulcrum.

  If the air density in the operating environment decreases, the positive pressure acting on the front positive pressure surface decreases, and the leading end approaches the recording medium and the pitch angle tends to decrease, but it is located closer to the trailing side than the working fulcrum. The intermediate positive pressure surface protrudes toward the recording medium side, and the fall of the flying height is suppressed at the intermediate positive pressure surface portion. Therefore, at this time, a moment is applied to the slider so that the leading side is lowered with the intermediate positive pressure surface as a fulcrum. Therefore, the trailing side end of the slider behaves as if it is separated from the recording medium with the working fulcrum as a fulcrum, and an extreme decrease in the trailing side end can be suppressed.

  For example, in the present invention, it is preferable that a difference in height between the intermediate pressure surface and the rear pressure surface is 2 nm or more and 10 nm or less.

  In the present invention, when the air density changes, the flying posture of the magnetic head is stabilized, and an extreme decrease in the flying height of the magnetic function unit can be suppressed. Therefore, when used in an environment with low air density, such as in high altitudes or in airplanes, the flying height between the magnetic function unit and the recording medium can be secured, and there is a risk of damage to the recording medium and magnetic function unit. Easier to avoid.

  FIG. 1A is a plan view showing a magnetic head device according to an embodiment of the present invention, with the side facing the recording medium facing forward, and FIG. 1B is a view taken in the direction of arrow B in FIG. FIG. FIG. 2A is a plan view showing the magnetic head device of the comparative example with the side facing the recording medium facing forward, and FIG. 2B is a side view of FIG. is there. FIG. 3 is a plan view showing the opposed state of the recording medium and the magnetic head device, and FIG. 4 is a side view showing a support device for supporting the slider. FIG. 5 is a diagram for explaining the variation of the flying height between the embodiment and the comparative example.

  FIG. 1 shows a slider 10 provided in a magnetic head device 1 according to an embodiment of the present invention. The slider 10 is formed in a cubic shape using alumina / titanium carbide or the like, and the magnetic function portion 2 is provided at the trailing side end of the slider 10.

  The magnetic function unit 2 uses a magnetoresistive effect (MR effect), a giant magnetoresistive effect (GMR effect), or a tunnel magnetoresistive effect (TMR effect) to read a magnetic signal recorded on the recording medium D. A magnetic material yoke and a conductive material coil are formed by a thin film process and have a recording function unit for writing a magnetic signal to the recording medium D.

  In FIG. 1A, the facing side 10a facing the recording medium D of the slider 10 is shown facing forward. As shown in FIG. 1B, the opposite side 10a to the recording medium D is the pressing side 10b, and a pressing force F for pressing the recording medium D acts on the pressing side 10b. The slider 10 has a leading side end face 10c facing the inflow side of the air flow generated on the surface of the recording medium D and a trailing side end face 10d through which the air flow flows out. It is provided on the side end face 10d.

  Further, the slider 10 has an inner peripheral side (ID side) side surface 10e directed to the rotation center side of the magnetic recording type recording medium D such as a hard disk shown in FIG. 3, and an outer peripheral side (OD) directed to the outer periphery of the recording medium. Side) 10f.

  In this specification, the direction toward the leading side end surface 10c is referred to as the front or the end toward the leading side end surface 10c is referred to as the front end, and the direction toward the trailing side end surface 10d is defined as the rear or end toward the trailing side end surface 10d. May be called the rear end. Further, a direction parallel to the leading side end surface 10c and the trailing side end surface 10d may be referred to as the left-right direction, the side facing the inner peripheral side surface 10e may be referred to as the left side, and the side facing the outer peripheral side surface 10f may be referred to as the right side.

  In FIG. 1A, a center line extending in the front-rear direction by dividing the leading side end face 10c and the trailing side end face 10d into two is indicated by OO. The center of the magnetic function part 2 is located on the center line OO.

  As shown in FIG. 4, in the magnetic head device 1, the back surface of the pressing side 10b of the slider 10 is supported by a support device. This support device is provided with a load beam 5 which is an elastic support member. An elastic deformation portion is provided at the base portion of the load beam 5, and a pressing force F in the recording medium D direction is applied to the slider 10 by the elastic force of the elastic deformation portion. A flexure 6 made of an elastic plate that is thinner than the load beam 5 and exhibits springiness is fixed to the tip of the load beam 5, and a support piece 6 a bent to the flexure 6 is attached to the slider 10. The back surface facing the pressing side 10b is bonded and fixed.

  A pivot 7 protruding downward is integrally formed at the tip of the load beam 5, and this pivot 7 abuts against the back surface of the pressing side 10 b of the slider 10 or abuts against the support piece 6 a. The elastic pressing force exerted by the load beam 5 acts on the acting fulcrum 7a, which is the contact point between the pivot 7 and the surface of the slider 10 on the pressing side 10b.

  The support piece 6a of the flexure 6 can be deformed in each direction, and the slider 10 fixed to the support piece 6a can change its posture with the acting fulcrum 7a that is a contact point with the pivot 7 as a fulcrum. It is supported. The main directions of the posture change are a pitch direction in which the center line OO is inclined and a roll direction in which the center line OO is inclined to the left and right around the center line OO. In FIG. 4, the angle formed with the surface of the recording medium D in the flying posture in which the leading end face 10 c is lifted is indicated by a pitch angle θp.

  In FIG. 1A, an action fulcrum 7a between the pivot 7 and the slider 10 is projected and shown. The action fulcrum 7a is located on the center line OO, and is located substantially at the midpoint between the leading end face 10c and the trailing end face 10d.

  As shown in FIGS. 1A and 1B, a front positive pressure surface 21 is formed on the opposite side 10a of the slider 10 in front of the working fulcrum 7a. The front positive pressure surface 21 is a flat surface facing the recording medium D, and has a width dimension in the left-right direction wider than a length dimension in the front-rear direction. The front edge portion 21a of the front positive pressure surface 21 is parallel to the leading side end surface 10c of the slider 10, and the front edge portion 21a is located farther rearward than the leading side end surface 10c. On both left and right sides of the front edge portion 21a, inclined edges 21c and 21c are formed that gradually recede toward the rear in the left-right direction. Further, the left and right side edges 21d and 21d of the front positive pressure surface 21 are located close to the side surfaces 10e and 10f of the slider 10, respectively. The rear edge portion 21e of the front positive pressure surface 21 is parallel to the front edge portion 21a, and the rear edge portion 21e is located in front of the action fulcrum 7a.

  A front step surface 22 is formed between the leading side end surface 10 c of the slider 10 and the front edge portion 21 a of the front positive pressure surface 21. The front step surface 22 is more distant from the recording medium D than the front positive pressure surface 21, and the step between the front step surface 22 and the front positive pressure surface 21 is about 0.1 μm.

  On the rear side of the front positive pressure surface 21, rail portions 22a and 22a extending rearward are formed. The rail portions 22 a and 22 a are flat surfaces having the same height as the front step surface 22. A negative pressure surface 25 is formed behind the rear edge portion 21e of the front positive pressure surface 21. The negative pressure surface 25 is a flat surface formed at a position further retracted from the recording medium D by about 1 to 3 μm than the front step surface 22 and the surfaces of the rail portions 22a and 22a. The trailing side end face 10d and both side faces 10e and 10f extend to the rear side.

  As shown in FIG. 4, when the recording medium D rotates with the opposite side 10 a of the slider 10 facing the recording medium D, the air flow (air bearing) formed on the surface of the recording medium D is changed to the leading side end face. From 10c, the recording medium D and the slider 10 are entered. The air flow is guided from the front step surface 22 to the front positive pressure surface 21 and is lifted to the front positive pressure surface 21 in a direction away from the recording medium D by the air flow flowing between the front positive pressure surface 21 and the recording medium D. The levitation pressure to act acts.

  Further, a step difference between the front pressure surface 21 and the negative pressure surface 25 is large behind the rear edge portion 21e of the front pressure surface 21, and rail portions 22a and 22a are located on both left and right sides of the step portion. is doing. Therefore, a region surrounded by the rail portions 22a and 22a behind the rear edge portion 21e is a negative pressure generation region 23. The air flow that has flowed through the surface of the front positive pressure surface 21 flows into the negative pressure generation region 23, so that a negative pressure is generated in the negative pressure generation region 23 so as to approach the recording medium D. The flying height of the leading edge 10 c of the slider 10 from the surface of the recording medium D is adjusted by the positive pressure acting on the front positive pressure surface 21 and the negative pressure acting on the negative pressure generating region 23.

  On the opposite side 10a of the slider 10, a rear positive pressure surface 31 is provided at a position further rearward than the action fulcrum 7a and closest to the trailing side end surface 10d. The rear positive pressure surface 31 is a flat surface at the same height as the front positive pressure surface 21, and the area of the rear positive pressure surface 31 is sufficiently smaller than the area of the front positive pressure surface 21. Further, rear step surfaces 32 and 32 are formed in front of the left and right side portions of the rear positive pressure surface 31. The rear step surfaces 32 and 32 are formed at the same height as the front step surface 22.

  A rear projecting surface 32a having the same height as the rear step surface 32 is formed behind the rear positive pressure surface 31, and the magnetic function unit 2 is disposed on the rear projecting surface 32a.

  Intermediate positive pressure surfaces 41, 41 are provided between the front positive pressure surface 21 and the rear positive pressure surface 31. The intermediate positive pressure surfaces 41 and 41 are respectively formed at positions that are separated from each other with the center line OO interposed therebetween. The intermediate positive pressure surfaces 41, 41 on both the left and right sides have their front edge portions 41a, 41a positioned rearward from the action fulcrum 7a. The total area of the two intermediate pressure surfaces 41 and 41 is smaller than the area of the front pressure surface 21.

  Each of the intermediate positive pressure surfaces 41 and 41 is a flat surface, and each of the intermediate positive pressure surfaces 41 and 41 protrudes closer to the recording medium D than the front positive pressure surface 21 and the rear positive pressure surface 31. The step h between the intermediate positive pressure surfaces 41 and 41 and the front positive pressure surface 21 or the rear positive pressure surface 31 is about 2 to 10 nm. In addition, intermediate step surfaces 42 and 42 are formed in front of the intermediate positive pressure surfaces 41 and 41. The intermediate step surfaces 42 and 42 are formed at the same height as the front step surface 22 and the rear step surface 32.

  Each pressure surface, step surface, and suction surface are planes, but the plane here is a concept including not only a pure plane with an infinite curvature radius but also a curved surface with a very large curvature radius. .

  The slider 10 having the shape shown in FIGS. 1A and 1B is milled from the opposite side 10a so that the intermediate pressure surfaces 41 and 41 have the smallest cutting allowance and the other portions are deeply cut. Thus, the intermediate positive pressure surfaces 41 are processed so as to have a shape closest to the recording medium D. Alternatively, the intermediate positive pressure surfaces 41 and 41 are processed so as to be on the same surface as the front positive pressure surface 21 and the rear positive pressure surface 31, and then the surface of the intermediate positive pressure surfaces 41 and 41 is made of a hard material such as DLC (Diamond Like Carbon). The step h may be formed by forming an inorganic film by means such as sputtering.

  In the magnetic head device 1 according to the embodiment, when air flows from the leading side to the trailing side between the slider 10 and the recording medium D, as described above, a large positive pressure is applied to the front positive pressure surface 21 having a large area. appear. Further, the positive pressure acts on the rear positive pressure surface 31 by the air flow between the rear positive pressure surface 31 and the recording medium D. As a result, as shown in FIG. 4, the slider 10 receives the pressure of air striking the opposite side 10 a of the slider 10, and the leading side end face 10 c is lifted upward so that the slider 10 has a pitch θp with respect to the surface of the recording medium D. It becomes the inclination posture which has. In addition, the trailing side end surface 10d is lifted from the surface of the recording medium D by a predetermined dimension by receiving the flying force acting on the rear positive pressure surface 31, and the magnetic function unit 2 provided on the trailing side end surface 10d and the recording medium D are provided. The spacing between the two is maintained.

  Further, positive pressure acts on the intermediate positive pressure surfaces 41 and 41 by the air flow applied to the opposite side 10 a of the slider 10. Since the intermediate positive pressure surfaces 41 and 41 are located left and right away from the center line OO, the positive pressure acting on both the intermediate positive pressure surfaces 41 and 41 stabilizes the inclined posture of the slider 10 in the roll direction. It is done.

  Further, as shown in FIG. 1B, the intermediate positive pressure surfaces 41 and 41 protrude from the rear positive pressure surface 31 so as to approach the recording medium D by a step h, so that the slider 10 is placed on the surface of the recording medium D. When approaching, a large levitation force acts on the intermediate positive pressure surface 41 by the air flow between the rear positive pressure surface 31 and the recording medium D, and the trailing side end 10d having the magnetic function portion 2 faces the recording medium. The descent is suppressed. Therefore, the flying distance of the magnetic function unit 2 from the surface of the recording medium D can be stabilized.

  When the magnetic head device 1 is used at a high altitude or in an airplane, the air density of the use environment is lowered, and as a result, the positive pressure acting on the front positive pressure surface 21 and the rear positive pressure surface 31 are affected. Positive pressure decreases. Therefore, the entire slider 10 is lowered toward the surface of the recording medium D. However, as the intermediate positive pressure surface 41 protruding as described above approaches the surface of the recording medium D, a floating force acts on the intermediate positive pressure surface 41, and the trailing side end surface 10d positioned behind the intermediate positive pressure surface 41 records. The descent toward the medium D can be suppressed. Therefore, even if the air density of the use environment is reduced, it is possible to prevent the flying distance of the magnetic function unit 2 from being extremely reduced.

  Furthermore, as shown in FIG. 4, the front positive pressure surface 21 is located in front of the action fulcrum 7a, and the intermediate positive pressure surface 41 is located behind the action fulcrum 7a. Therefore, when the air density decreases and the levitation force acting on the front positive pressure surface 21 decreases, the pitch angle θp of the inclined posture of the slider 10 decreases. At this time, the intermediate positive pressure surface 41 protrudes toward the recording medium D, and positive pressure preferentially acts on the intermediate positive pressure surface 41 approaching the recording medium D. Since the action fulcrum 7a is located in front of it, a moment M is applied to the slider 10 so that the leading side end face 10c descends with the opposing portion between the intermediate positive pressure surface 41 and the recording medium D as a fulcrum. To do. By this moment M, the trailing side end face 10d tends to be lifted away from the recording medium D, with the intermediate positive pressure face 41 as a fulcrum. Therefore, when the air density decreases, the pitch angle θp decreases, but the flying distance of the magnetic function unit 2 does not decrease and becomes stable.

(Example)
The slider 10 shown in FIGS. 1A and 1B is used, and the step h between the intermediate positive pressure surface 41 and the rear positive pressure surface 31 is 2 nm in Example 1, and h = 5 nm. In Example 2, the sample was set to Example 2, h = 7 nm was set to Example 3, and h = 10 nm was set to Example 4.

(Comparative Example 1)
A magnetic head device using the same slider as that of the example, in which the intermediate positive pressure surface 41 is formed on the same surface as the front positive pressure surface 21 and the rear positive pressure surface 31, that is, the step h = 0. It was set to 1.

(Comparative Example 2)
A magnetic head device using the slider 100 shown in FIGS.

  In the slider 100 shown in FIGS. 2A and 2B, the intermediate positive pressure surface 141 and the rear positive pressure surface 31 are formed in the same pattern as the slider 10 shown in FIG. However, the intermediate positive pressure surface 141 and the rear positive pressure surface 31 are formed on the same surface. As shown in FIG. 2A, the front positive pressure surface 121 is formed to have a shape corresponding to a pattern obtained by removing the central portion of the front positive pressure surface 21 shown in FIG. A front step surface 122 is formed in front of the front positive pressure surface 121 and between the left and right front positive pressure surfaces 121, 121.

  The front positive pressure surfaces 121 and 121 are located closer to the recording medium D than the rear positive pressure surface 31 and the intermediate positive pressure surface 41, and the step hs between the front positive pressure surface 121 and the rear positive pressure surface 31 and the intermediate positive pressure surface 41. Is 5 nm.

(Evaluation)
A computer analysis simulation was performed assuming a slider having the same structure as the magnetic head device of each example and the magnetic head device of each comparative example. In this simulation, the long side of the slider 10 of the magnetic head device 1 is 1.24 mm, the short side is 1.00 mm, the step between the front positive pressure surface 21 and the front step surface 22 is 1.10 μm, and the front positive pressure surface 21 is negative. The level difference with the pressure surface 25 was 2.10 μm. The pressing force (load pressure) F acting on the acting fulcrum 7a in the direction of the recording medium D was 19.6 mN, and the rotational speed of the recording medium D was 5400 rpm.

  FIG. 5 shows the evaluation results. As shown in FIG. 3, the horizontal axis OD indicates that the slider is positioned on the outermost side of the recording area of the recording medium D, the ID is positioned on the innermost side, and the OD is in the middle. When it is located. In the ID, the distance from the rotation center of the recording medium to the center line OO of the slider is 14.3 mm, MD is 19.7 mm, and OD is 29.7 mm.

  The vertical axis in FIG. 5 indicates the rate of flying height due to the change in air density. This shows in% the flying distance at 0.7 atm when the flying distance from the recording medium D to 1 atm is 100.

  In each of OD, MD, and ID of FIG. 5, Comparative Example 1 is (a), Examples 1, 2, 3, and 4 are (b), (c), (d), and (e), and Comparative Example 2 is ( f).

  According to FIG. 5, it can be seen that the decrease in the flying height is smaller than that in Comparative Examples 1 and 2 in each example. It can also be seen that the greater the step h shown in FIG. From FIG. 5, if at least the level difference h is 2 nm or more and 10 nm or less, a decrease in the flying distance when the air density is reduced can be suppressed.

(A) is a plan view showing the magnetic head device according to the embodiment of the present invention with the opposite side facing forward, (B) is a side view as seen from arrow B in (A), (A) is a top view which shows the magnetic head apparatus of the form of a comparative example with the opposing side toward this side, (B) is a side view of the arrow B of (A), A plan view showing a facing position between the recording medium and the magnetic head, A side view of a support device for supporting the magnetic head device; The diagram which shows the evaluation result of an Example and a comparative example,

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic head apparatus 2 Magnetic function part 7a Action fulcrum 10 Slider 10a Opposite side 10b Pressing side 10c Leading side end surface 10d Trailing side end surface 21 Front positive pressure surface 22 Front step surface 31 Rear positive pressure surface 41 Intermediate positive pressure surface

Claims (4)

A slider having a side facing the recording medium and a pressing side on which a pressing force is applied toward the recording medium, and a magnet that is provided on the trailing side of the slider and exhibits at least one function of magnetic recording and magnetic reproduction In a magnetic head device having a functional part,
On the opposite side of the slider, a front pressure surface located on the leading side, a rear pressure surface located on the trailing side, and an intermediate pressure surface located between the front pressure surface and the rear pressure surface are formed. The magnetic head device is characterized in that the intermediate positive pressure surface is formed at a position protruding from the rear positive pressure surface toward the recording medium.   The magnetic head device according to claim 1, wherein the intermediate positive pressure surface is located on the left and right sides of a center line extending from the leading side of the slider to the trailing side.   The support mechanism for supporting the slider is provided with an action fulcrum for applying a pressing force toward the recording medium at one place on the pressure side of the slider, and the intermediate positive pressure surface is more trailing than the action fulcrum. The magnetic head device according to claim 1, wherein the magnetic head device is located on a side.   4. The magnetic head device according to claim 1, wherein a difference in height between the intermediate positive pressure surface and the rear positive pressure surface is 2 nm or more and 10 nm or less. 5.

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