JPH0773629A - Levitation type magnetic head device - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to improve the contact start / stop durability of the flying type magnetic head device, improve the product life, prevent stiction, and obtain good electromagnetic conversion characteristics. It is also possible to support a low flying height of the slider. A slider in which a slider rail that contacts the magnetic recording medium when stopped is formed on the magnetic recording medium facing surface side, and a longitudinal end of the slider rail so that a magnetic gap faces the magnetic recording medium facing surface of the slider rail. The magnetic head element mounted on the above portion constitutes a floating magnetic head device, and the slider rail is formed in a crown shape, an arbitrary rail length thereof is L (μm), and a crown amount corresponding to the arbitrary rail length is c ( μm), rail length 25
The crown amount corresponding to 00 μm is b (however, 0.02
(Μm) <b <0.1 (μm). ), They have a relationship of c = b × (L / 2500) ² .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating magnetic head device used in a hard disk drive device,
Especially, information is recorded / reproduced with a minute gap on the surface of the magnetic recording medium, and a contact start / stop type floating magnetic contacting the surface of the magnetic recording medium (hereinafter referred to as a magnetic disk) when stopped. The present invention relates to a head device.

[0002]

2. Description of the Related Art In a hard disk drive device for recording or reproducing information on a hard disk or the like, in order to avoid abrasion damage due to contact between the magnetic head and the surface of the magnetic disk, the magnetic head contacts the magnetic disk at the time of stop, A so-called contact start / stop type flying magnetic head device is used in which the magnetic head floats and runs with a minute gap above the surface of a magnetic disk that rotates at high speed during recording and reproduction.

In the above contact start / stop type floating magnetic head device, for example, a slider rail is formed so as to project on the magnetic disk facing surface side, and the magnetic disk facing surface of the slider rail generates an air flow generated on the magnetic disk surface. A magnetic head element that records and reproduces information is mounted on a slider that is an air bearing surface that is the receiving surface and has a groove called an air groove into which an air flow flows between the slider rails. The suspension is attached to the slider as a support, and the suspension is attached to the actuator arm. The magnetic head element is mounted on the air outflow end side of the slider rail so that its magnetic gap faces the air bearing surface. And
The actuator arm is for moving a slider attached to the tip thereof in the radial direction of the magnetic disk, and is moved on the magnetic disk while rotating about a rotation axis to draw an arc-shaped trajectory on the slider. An actuator arm, that is, a so-called swing arm type actuator arm is generally used.

Therefore, the slider on which the magnetic head element is mounted comes into contact with the surface of the magnetic disk due to the downward spring load from the suspension when the magnetic disk stops rotating, and when the magnetic disk rotates, the slider rotates. The air bearing surface receives an upward lift due to the generated airflow and a downward spring load from the suspension to levitate with a slider flying distance determined by the balance of these forces. Then, the actuator arm is rotated to move in the radial direction within the surface of the magnetic disk to record / reproduce information on / from a predetermined recording track.

[0005]

By the way, the contact start / stop type flying magnetic head device as described above is required to have improved contact start / stop durability. In the floating magnetic head device, as described above, the slider contacts the surface of the magnetic disk when stopped, and the slider slides on the surface of the magnetic disk immediately after the starting operation or immediately after the stopping operation. At this time, since the slider surface and the magnetic disk surface are very smooth surfaces, the slider surface and the magnetic disk surface are easily worn, and so-called contact start / stop durability is not good. In addition, this will greatly reduce the product life of the floating magnetic head device.

Therefore, it has been proposed to shorten the sliding time between the slider and the magnetic disk to reduce the abrasion of the slider surface and the magnetic disk surface and improve the contact start / stop durability. As a specific method, the air bearing surface of the slider rail is formed in an arc shape in the longitudinal direction, that is, the slider rail is formed into a so-called crown shape, and a large pitch angle is given to the slider to form a magnetic disk of the slider. Techniques for reducing the sliding time have been proposed.

Further, in the above-mentioned contact start / stop type floating magnetic head device, sticking (so-called stiction) between the slider and the magnetic disk is a problem. That is, as described above, in the floating magnetic head device, the slider and the magnetic disk are in contact with each other when stopped, but stiction occurs because the surfaces of both are very smooth. Such stiction causes various inconveniences.

Although it is possible to reduce the flatness of the surface of the slider and the magnetic disk to prevent stiction, in recent years, the flying height of the slider has been required to be reduced in accordance with the high density recording. There is a tendency to increase the flatness of the magnetic disk, and it is impossible to reduce the flatness as described above.

Therefore, as described above, the slider rail is formed in a crown shape, and a large pitch angle is given to the slider to shorten the sliding time between the slider and the magnetic disk, while suppressing the substantial contact area between the slider and the magnetic disk. It is proposed to prevent stiction. Further, in the crown-shaped slider rail as described above, it is considered that the larger the crown amount is, the higher the above effect is.

However, if the crown amount is too large, the distance between the magnetic head element mounted on the air outflow end side of the slider rail and the magnetic disk, that is, the flying distance of the magnetic head element becomes large, resulting in good electromagnetic conversion. It will be difficult to obtain the characteristics, and it will be difficult to cope with the reduction of the flying distance of the slider.

Therefore, the present invention has been proposed in view of the conventional circumstances, and by shortening the sliding time between the slider and the magnetic disk, the contact start / stop durability is improved and the product life is improved. It is an object of the present invention to provide a flying type magnetic head device capable of preventing stiction, achieving good electromagnetic conversion characteristics, and capable of supporting a reduced flying height of a slider.

[0012]

In order to achieve the above-mentioned object, the present invention has a slider on the surface facing the magnetic recording medium, the slider rail being in contact with the magnetic recording medium when stopped. In a flying magnetic head device in which a magnetic head element is mounted at the longitudinal end of a slider rail so that a magnetic gap faces the magnetic recording medium facing surface, the slider rail has a crown shape Rail length of L
(Μm), the amount of crown corresponding to any rail length is c
(Μm), the amount of crown corresponding to the rail length 2500 μm is b (where 0.02 (μm) <b <0.1 (μm)
Is. ), These are c = b × (L / 2
It is characterized by having a relationship of 500) ² .

Further, the present invention is characterized in that, in the flying magnetic head device as described above, a plurality of slider rails of the slider are formed.

Further, the present invention is characterized in that, in the flying magnetic head device as described above, the slider rail of the slider is provided at least on the center line of the surface facing the magnetic recording medium.

According to the present invention, in the flying magnetic head device as described above, the slider rail of the slider is provided on the center line of the surface facing the magnetic recording medium, and a pair of side rails is provided on both sides of the slider rail. The flatness of the surface of the rail facing the magnetic recording medium is larger than the flatness of the surface of the side rail facing the magnetic recording medium.

Furthermore, according to the present invention, in the flying magnetic head device as described above, the rail length of the side rails provided on both sides of the slider rail provided on the center line of the surface facing the magnetic recording medium is the rail length of the slider rail. It is characterized by being smaller than.

[0017]

According to the present invention, a slider having a slider rail which is in contact with the magnetic recording medium at the time of stop is formed on the side of the magnetic recording medium facing surface, and the magnetic gap is made to face the magnetic recording medium facing surface of the slider rail. In a flying-type magnetic head device in which a magnetic head element is mounted on a longitudinal end of a slider rail, the slider rail has a crown shape, and an arbitrary rail length thereof is L (μ
m), the crown amount corresponding to an arbitrary rail length is c (μ
m), the crown amount corresponding to the rail length of 2500 μm is b
(However, when 0.02 (μm) <b <0.1 (μm).), These are c = b × (L / 250).
0) ² , the slider is provided with a sufficient pitch angle, the substantial contact area between the slider and the magnetic recording medium is reduced, and the flying distance of the magnetic head element mounted at the end of the slider rail in the longitudinal direction. Does not become extremely large.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings.

Embodiment 1 First, the structure of a floating magnetic head device will be described.
As shown in FIG. 1, the levitation type magnetic head device is configured such that a slider 1 on which a magnetic head element (not shown) is mounted is attached to a suspension 2 and attached to an actuator arm 3. The slider 1 and the suspension 2 are often handled as one component, and the head gimbal assembly (HG
Often referred to as A).

A downward spring load from the suspension 2 is constantly applied to the slider 1.
Therefore, when the slider 1 is stopped, the magnetic recording medium (hereinafter referred to as a hard disk) is loaded by the spring load.
4 Hard disk 4 in contact with the surface and when recording / reproducing information
In the figure, the robot lifts up due to the upward lift force generated by the air flow generated by the rotation in the R ₁ direction, and has a slider floating distance determined by the balance between the lift force and the spring load of the suspension 2 to fly over the hard disk 4. Then, the information is recorded and reproduced on the hard disk 4, and when the information is stopped, the information is dropped onto the hard disk 4.

When the hard disk 4 rotates in the direction of arrow R _{1 in the} figure, the actuator arm 3 rotates in the direction of R _{2 in the} figure, and the slider 1 attached to the suspension 2 moves as shown by the arrow M in the figure. Let's move the slider 1
The magnetic head element mounted on the disk is moved to each radial position of the hard disk 4 to enable recording / reproducing of information.

When the slider 1 moves in the radial direction on the hard disk 4 in the floating magnetic head device as described above, the angle at which the air flow generated by the rotation of the hard disk 4 flows into the slider 1 changes. Although the upward lift force may change, in the flying magnetic head device as described above, the lift force received by the slider 1 is made substantially constant by devising the shape of the slider 1 or the like. The levitation distance is set to be almost constant.

Next, an enlarged view of the slider 1 of the floating magnetic head device is shown in FIG. The slider 1 is such that rail processing is performed on the hard disk facing surface 1a side of the slider 1 to form air grooves 5, and slider rails 6 and 7 are formed as protrusions on both sides of the air grooves 5. . Further, the magnetic head element 8 is an air bearing surface 7 of one slider rail 7.
It is provided on one side surface 7b that is orthogonal to a and is on the air outflow end side, and the magnetic gap faces the air bearing surface 7a. As the magnetic head element 8, either a thin film head or a bulk head such as a MIG head can be used. Further, the slider rails 6 and 7 are formed with tapers 9 and 10 on the air inflow end side which are very gentle slopes with an angle of 1 ° or less. The slider as described above is generally called a taper flat type.

At this time, in the levitation type magnetic head device of this embodiment, in particular, as schematically shown in FIG. 3, the slider rails 6 and 7 of the slider 1 (only the slider rail 7 is shown in the figure). ) Has a crown shape, an arbitrary rail length thereof is L (μm), and a crown amount corresponding to the arbitrary rail length is c (μm). These have the following relationships.

C = b × (L / 2500) ² (where b is the crown amount corresponding to the rail length of 2500 μm, and 0.02 (μm) <b <0.1 (μm))

By the way, in the levitation type magnetic head device using a slider having a crown-shaped slider rail, when the slider and the hard disk come into contact with each other when stopped, a downward spring load by the suspension is applied to the slider. 4A and 4B, the slider rails 17 of the sliders 11 and 21,
27 is a slider rail surface 17a indicated by broken lines in the drawings,
27a is plastically deformed into a shape conforming to the shapes of the hard disks 14 and 24. Therefore, the contact areas between the sliders 11 and 21 and the hard disks 14 and 24 are S ₁ and S ₂ shown by the shaded areas in the figure, which are the vicinity of the contact points between the sliders 11 and 21. The contact areas S ₁ and S ₂ are determined by the sliders 11 and 2.
If the downward spring load applied to 1 is constant, it is determined by the radius of curvature of each slider rail 17, 27, that is, the crown amount. For example, when the amount of crown of the slider rail 17 is large like the slider 11 shown in FIG. 4A, the contact area S ₁ is small, and like the slider 21 shown in FIG.
When the crown amount of 7 is small, the contact area S ₂ is large.

Therefore, the sliders 11 and 2 as described above are used.
1, when the slider rail surfaces 17a and 27a have the same flatness, the slider 21 having a large contact area S ₂ is more likely to cause stiction. In other words, a slider having a slider rail with a small crown amount is likely to cause stiction, and a slider having a slider rail with a large crown amount is unlikely to cause stiction.

If the crown amount is increased, the slider can be given a large pitch angle. That is, if the crown amount of the slider having a crown shape is set to a certain amount or more, the substantial contact area is suppressed, so that the occurrence of stiction can be suppressed and a large pitch angle can be given to the slider.

As described above, in the levitation type magnetic head device of this embodiment, since the slider rail of the slider has a crown shape and the amount of the crown is regulated, a proper amount of the crown is given and the stiction is given. It is thought that the occurrence of Further, in the floating magnetic head device of this embodiment, since a proper crown amount is given, a large pitch angle is given to the slider, the sliding time between the slider and the hard disk is shortened, and contact start / stop durability is improved. It is believed that the product life is improved and the product life is extended.

Therefore, in order to confirm the effect of the floating magnetic head device of this embodiment, the following experiment was conducted. That is, a microslider having a crown shape was prepared using a ferrite material and an altic material with a rail length of 2500 μm, and the relationship between the crown amount b and stiction was investigated. As the investigation method, a method of measuring the amount of increase in the friction coefficient before and after the contact start / stop test of each slider was used. Results are shown in FIG. In FIG. 5, the horizontal axis is the crown amount b corresponding to the rail length of 2500 μm, and the vertical axis is the increase / decrease ratio of the friction coefficient (however, friction coefficient after test / friction coefficient before test).
Shows the result of the micro slider made of ferrite material, and + in the figure shows the result of the micro slider made of Altic material.

As can be seen from the results shown in FIG. 5, the larger the crown amount b corresponding to the rail length of 2500 μm is, the smaller the increase in the friction coefficient is and the stiction is generated in both the micro sliders made of ferrite material and Altic material. It was confirmed that it could be suppressed. In particular, with respect to the micro slider made of AlTiC material used for the thin-film magnetic head often used in the above-mentioned floating magnetic head device, the crown amount b corresponding to the rail length of 2500 μm is set to 20 nm or more. It was confirmed that the operation could be suppressed. Further, it is considered that a sufficient pitch angle can be imparted to the microslider by setting the crown amount b to 20 nm or more.

Therefore, in order to give the slider of the floating magnetic head device of this embodiment the same effect as the above-mentioned micro slider having a rail length of 2500 μm and a crown amount b of 0.02 μm or more, the above slider is used. Where L is an arbitrary rail length of L (μm) and c is an amount of crown corresponding to an arbitrary rail length, c = b ×
The relationship of (L / 2500) ² is established, and the crown amount b corresponding to the rail length of 2500 μm is 0.02 (μ
m) or more. That is, in the flying type magnetic head device of the present embodiment using the slider satisfying the above relationship, stiction is suppressed, a large pitch angle is given to the slider, and contact time is reduced by shortening the sliding time between the slider and the hard disk. Start / stop durability is improved and product life is extended.

Further, in the flying type magnetic head device of this embodiment, as schematically shown in FIG. 6, the magnetic head element 8 has a magnetic gap on the air outflow end side of one slider rail 7 of the slider 1. The slider rail 7 is mounted so as to face the air bearing surface 7a, and since the slider rail 7 has a crown shape, the flying distance H _{1 of the} slider 1 and the distance between the magnetic head element 8 and the hard disk 4, that is, the magnetic head element 8 Difference occurs in the levitation distance H ₂ . As described above, the larger the crown amount of the slider rail, the more effective it is in suppressing the occurrence of stiction and imparting the pitch angle. However, when the crown amount is too large, the difference between the flying distance H ₁ and the flying distance H ₂ is increased. Also grows,
Since the distance between the magnetic head element 8 and the hard disk 4 also becomes large, it becomes difficult to obtain good electromagnetic conversion characteristics. Further, when the flying height of the slider is reduced, the deterioration of the electromagnetic conversion characteristics as described above is remarkable.

By the way, in the above-mentioned microslider, in order to secure a good electromagnetic conversion characteristic and to achieve a low flying height of the slider, the rail length is 25
The crown amount b corresponding to 00 μm is 100 nm or less. Therefore, in order to give the slider of the floating magnetic head device of this embodiment the same effect as that of the micro slider, the arbitrary rail length of the slider is set to L.
(Μm) and the crown amount corresponding to an arbitrary rail length is c (μm), c = b × (L / 2500) ²
And the crown amount b corresponding to the rail length of 2500 μm is set to 0.1 (μm) or less. That is, in the levitation type magnetic head device of the present embodiment using the slider satisfying the above relationship, good electromagnetic conversion characteristics are secured and the levitation distance of the slider is reduced.

Therefore, in the levitation type magnetic head device of this embodiment, since a proper amount of crown is given to the slider rail, the occurrence of stiction is suppressed, a sufficient pitch angle is given, and the slider and the hard disk slide. Contact start / stop durability is improved by shortening the moving time, and the product life is extended. Further, in the flying type magnetic head device of this embodiment, since a proper amount of crown is given to the slider rail, good electromagnetic conversion characteristics are secured and the flying height of the slider is reduced.

Second Embodiment In the first embodiment, the flying type magnetic head device using the slider having two slider rails has been described, but the present invention can be applied to other flying type magnetic head devices. is there.

For example, a slider 31 as shown in FIG.
It is also applicable to a floating magnetic head device using the. The slider 31 has slider rails 37 that are isosceles triangular projections formed on the center line of the hard disk facing surface 31a on the hard disk facing surface 31a side, and rectangular sliders on both sides of the slider rail 37. The side rails 34 and 36 are formed, and an air groove 35 is formed between the slider rail 37 and the side rails 34 and 36. The slider rail 37 is formed such that the base of the isosceles triangle is located on the air outflow end side, and one of the side rails 34, 3 is formed.
No. 6 has tapers 39 and 40 that are very gentle slopes with an angle of 1 ° or less on the air inflow end side, and are formed up to the middle of the slider 31 in the longitudinal direction. Further, the magnetic head element 38 is an air bearing for the slider rail 37.
It is provided on one side surface 37b which is orthogonal to the surface 37a and is on the air outflow end side, and the magnetic gap faces the air bearing surface 37a. As the magnetic head element 38, either a thin film head or a bulk head such as a MIG head can be used.

At this time, in the floating magnetic head device of this embodiment, as schematically shown in FIG. 8, the slider rail 37 of the slider 31 and the side rails 34, 3 are provided.
6 has a crown shape, and the slider rail 37 projects from the side rails 34 and 36. That is, in the slider 31, only the slider rail 37 contacts the hard disk 39 when stopped. When an arbitrary rail length of the slider rail 37 is L (μm) and a crown amount corresponding to the arbitrary rail length is c (μm), these are c
= B × (L / 2500) ² (b is rail length 25
The amount of crown corresponding to 00 μm is 0.02 (μ
m) <b <0.1 (μm). ) Is said to satisfy the relationship. Further, in the floating magnetic head device of the present embodiment, the air bearing surface 37a which is the surface of the slider rail 37 facing the hard disk 39 is formed.
Hard disk 3 with flatness of side rails 34 and 36
9 air bearing surfaces 34a,
It may be larger than the flatness of 36a.

Therefore, the slider of the floating magnetic head device of the present embodiment is expected to have the same effect as the slider of the floating magnetic head device of the first embodiment, and is in contact with the hard disk to mount the magnetic head element. Since an appropriate amount of crown is given to the rail, the occurrence of stiction is suppressed and a sufficient pitch angle is given,
By shortening the sliding time between the slider and hard disk, contact start / stop durability is improved and the product life is extended. Further, in the flying type magnetic head device of this embodiment, since a proper amount of crown is given to the slider rail, good electromagnetic conversion characteristics are secured and the flying height of the slider is reduced.

By the way, in manufacturing the floating magnetic head device of this embodiment, the crown shape processing of the slider rail is the most important step, but the above steps must be performed with attention to the following points. .

As a method of processing the crown shape of the slider rail, first, a method of polishing the slider rail and the side rail individually in the longitudinal direction can be mentioned.
When polishing is performed by the above method, as shown schematically in FIG. 8, the air bearings of the slider rail 37 are
The air bearing surfaces 34a and 36a of the side rails 34 and 36 may be twisted surfaces with respect to the surface 37a.

For example, as shown in the figure, the side rail 3
The air bearing surface 34a of No. 4 is a surface whose air inflow end side is located further from the hard disk 39 than the planned machining position, and whose air outflow end side is closer to the hard disk 39 than the planned machining position. Air bearing surface 36a of rail 36
In this case, the air inflow end side of the surface is located closer to the hard disk 39 than the planned processing position, and the air outflow end side is a surface located farther from the hard disk 39 than the planned processing position.

Even in such a case, the side rail
The protruding points of 34 and 36 are the protruding points of the slider rail 37.
It is necessary to process it so that it is even lower. That is,
Crow corresponding to any rail length of the rider rail 37
And the side rails 34 and 36 are scheduled to move.
The amount of crows is h, and the actual amount of each crown is h
_Four , H₆ And the amount of twist (twist amount) on the surface
When the value measured by the shape measuring machine is t,
It is necessary to perform processing so that

H ₄ = h + t / 2 h ₆ = h + t / 2 h + t / 2 <c

Further, as a method for performing the crown shape processing of the slider rail, in addition to the above method, FIG.
As schematically shown in FIG. 1, the slider rail 37 and the side rails 34 and 36 may be individually polished so that their cross sections have a substantially semicircular shape. Also in this case, the lateral crown amount r ₇ of the slider rail 37 is equal to the lateral crown amounts r ₄ and r of the side rails 34 and 36.
Processed to be larger than ₆ , slider rail 3
The protrusion point of 7 is higher than the protrusion points of the side rails 34 and 36.

As another method for forming the crown shape of the slider rail, as shown schematically in FIG. 10, the slider rail 37 and the side rails 34, 36 are provided.
There is a method of collectively polishing. When polishing is performed by this method, the polishing is performed so as to form a mountain shape as a whole, and the amount of unevenness in polishing of the inner portions of the side rails 34 and 36 with respect to the outer portions, that is, the so-called camber amount becomes a positive value. To do so.

In the slider having the slider rail and the side rail as described above, the polishing is not performed within the range of the above processing conditions, and the side rail is formed so as to protrude from the slider rail. When the flying type magnetic head device is formed as a result, only one side rail is likely to come into contact with the hard disk when stopped. When such a one-sided contact occurs, the contact pressure at that portion becomes extremely high, abnormal wear of the hard disk occurs, and the durability of the hard disk is significantly impaired. Therefore, it is necessary to carry out polishing of the slider rail while paying close attention to the above processing conditions.

[0048]

As is apparent from the above description, the present invention has a slider on the surface facing the magnetic recording medium, the slider rail being in contact with the magnetic recording medium when the slider is stopped. In a flying magnetic head device in which a magnetic head element is mounted on the longitudinal end of a slider rail so that a magnetic gap faces the medium facing surface, the slider rail has a crown shape, and any slider rail is provided. Length is L
(Μm), the amount of crown corresponding to any rail length is c
(Μm), the amount of crown corresponding to the rail length 2500 μm is b (where 0.02 (μm) <b <0.1 (μm)
Is. ), These are c = b × (L / 2
Because of the relationship of 500) ² , the slider is provided with a sufficient pitch angle, and the contact start / stop durability is improved by shortening the sliding time between the slider and the hard disk, and the product life is improved. The vibration resistance is also improved by shortening the sliding time between the slider and the hard disk.

Further, since the slider rail is provided with an appropriate amount of crown, the substantial contact area between the slider and the magnetic recording medium is reduced, stiction is suppressed, and the spindle motor for operating the flying magnetic head device is reduced. The reduction of power consumption and miniaturization are also achieved.

Furthermore, since the slider rail is provided with an appropriate amount of crown, the flying distance of the magnetic head element mounted at the end of the slider rail in the longitudinal direction does not become extremely large, and good electromagnetic conversion characteristics are obtained. Obtained,
It is also possible to support a low flying height of the slider.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of essential parts showing a configuration of a floating magnetic head device according to a first embodiment.

FIG. 2 is a perspective view showing a slider of the floating magnetic head device according to the first embodiment.

FIG. 3 is a side view schematically showing a slider of the floating magnetic head device according to the first embodiment.

FIG. 4 is a side view schematically showing a state where a slider is in contact with a hard disk.

FIG. 5 is a view showing a relationship between a crown amount b and a friction coefficient increase / decrease ratio corresponding to a rail length of 2500 μm of a micro slider made of a ferrite material or an Altic material.

FIG. 6 is a side view schematically showing the relationship between the flying distance of a slider and the flying distance of a magnetic head element.

FIG. 7 is a perspective view showing a slider of a floating magnetic head device according to a second embodiment.

FIG. 8 is a side view schematically showing a slider of a floating magnetic head device according to a second embodiment.

FIG. 9 is a cross-sectional view schematically showing an example of a method of performing crown shape processing of a slider rail of a slider of a floating magnetic head device according to a second embodiment.

FIG. 10 is a cross-sectional view schematically showing another example of the method of performing crown shape processing of the slider rail of the slider of the flying magnetic head device of the second embodiment.

[Explanation of symbols]

 1, 31 ... Slider 1a, 31a ... Hard disk facing surface 4, 39 ... Hard disk 6, 7, 37 ... Slider rail 8, 38 ... Magnetic head element 34, 36 ... Side rail b: Crown amount corresponding to 2500 μm rail length c: Crown amount corresponding to arbitrary rail length L: Arbitrary rail length

Claims (5)

[Claims] 1. A slider rail is provided on a surface of the magnetic recording medium facing surface, the slider rail being in contact with the magnetic recording medium when the slider rail is stopped. The slider rail is configured so that a magnetic gap faces the magnetic recording medium facing surface of the slider rail. In a floating magnetic head device in which a magnetic head element is mounted on the longitudinal end of the slider rail, the slider rail has a crown shape, and the arbitrary rail length corresponds to L (μm) and the arbitrary rail length. The crown amount is c (μm), and the crown amount corresponding to the rail length of 2500 μm is b (however, 0.02 (μm) <
b <0.1 (μm). ), These have a relationship of c = b × (L / 2500) ² and the flying type magnetic head device. 2. The flying magnetic head device according to claim 1, wherein a plurality of slider rails of the slider are formed. 3. The flying magnetic head device according to claim 1, wherein the slider rail of the slider is provided at least on the center line of the surface facing the magnetic recording medium. 4. The slider rail of the slider is provided on the center line of the surface facing the magnetic recording medium, and a pair of side rails is provided on both sides of the slider rail, and the flatness of the surface facing the magnetic recording medium of the slider rail is equal to that of the side rail. 4. The flying type magnetic head device according to claim 1, wherein the flying magnetic head has a flatness greater than that of the surface facing the magnetic recording medium. 5. The rail length of the side rails provided on both sides of the slider rail provided on the center line of the magnetic recording medium facing surface is smaller than the rail length of the slider rail. The flying type magnetic head device described.