JPH08203190A - Contact type magnetic disk device - Google Patents

Abstract

PURPOSE: To obtain a contact type magnetic disk device which suppresses the jumping of magnetic head slider, does not wear and damage a magnetic disk medium and has high reliability. CONSTITUTION: This contact type magnetic disk device has an electromagnetic transducing element 1 at this front end and has a contact pad 4. This contact pad 4 is mounted at a magnetic head slider 2 via a damper layer 3. The contact pad including the electromagnetic transducing element 1 may be arranged forward in the progressing direction of a magnetic disk medium and the two contact pads without contg. the electromagnetic transducing element 1 may be arranged backward in parallel. The hardness of the damper layer 3 may be specified to be 1 to 10GPa and a fluororesin, porous SiO2 and ZrO2 may be used for the material thereof and further, the mass of the contact pad 4 may be confined to <=0.1g. As the result, the impact force at the time of contact of the contact pads and the magnetic disk medium is relieved and the wear and damage by a magnetic head slider are lessened. The contact type magnetic disk device having the high durability and reliability is thus obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact type magnetic disk device, and more particularly to a contact type magnetic disk device for recording and reproducing while a magnetic head slider slides in contact with a magnetic disk medium.

[0002]

2. Description of the Related Art In recent years, high recording density has been steadily improved in the field of information storage files. Therefore, in the magnetic disk device, it is one of the important factors for increasing the recording density to make the gap between the magnetic head for writing / reading information and the magnetic disk medium holding the information smaller. There is. By the way, in a floating magnetic disk device using a magnetic head slider having an air bearing surface, in order to reduce the impact of the magnetic head slider on the magnetic disk medium and prevent mechanical damage to the magnetic disk medium, It is known to provide a damper layer on the medium (for example, JP-A-59-2297).
No. 43, No. 60-195738, No. 62-26622, No. 62-287415, No. 62-289913, and No. 3-1.
7814 publication).

On the other hand, in order to reduce the distance between the magnetic head slider and the magnetic disk medium, a magnetic head slider is used instead of the above-mentioned floating magnetic disk device.
A so-called contact-type magnetic disk device has been developed which performs recording / reproduction while sliding on a surface of a magnetic disk medium (for example, H. Hamilton: Journal of Magnetic Society).
of Japan, Vol.15, Supplement No. S2 (1991) 483, and JP-A-5-508808).

[0004]

In the above-described conventional floating type magnetic disk device, the distance between the magnetic head slider and the magnetic disk medium cannot be zero. on the other hand,
In the contact-type magnetic disk device, in order to prevent the magnetic head slider from jumping on the surface of the magnetic disk medium, it is necessary to increase the pressing load of the magnetic head slider, which causes wear and damage to the magnetic head and the magnetic disk medium. There is a risk of Further, in order to prevent wear damage, the pressing load of the magnetic head slider must be reduced, and under a contradictory condition, a magnetic head slider that simultaneously satisfies jump suppression and wear damage reduction is required. .

In order to suppress the jump and reduce the wear damage, it is necessary to provide a buffer layer called a damper layer or a shock absorbing layer as in a magnetic disk medium used in a floating magnetic disk device. Although it is effective in preventing mechanical damage to the medium, it has a drawback in that it is not possible to simultaneously satisfy the problems of the contact-type magnetic disk drive such as suppression of jump and reduction of wear damage.

An object of the present invention is to provide a contact type magnetic disk device having a high recording density and a high reliability which solves the above problems.

[0007]

SUMMARY OF THE INVENTION A contact type magnetic disk device of the present invention is provided with a contact pad having an electromagnetic conversion element for recording / reproducing formed at its tip and slidingly contacting with a magnetic disk medium, and mounting the contact pad. A magnetic head slider,
In a contact-type magnetic disk device including a magnetic head slider support mechanism that supports this magnetic head slider,
A damper layer may be provided between the magnetic head slider and the contact pad.

Further, the contact pad comprises three contact pads, one contact pad including the electromagnetic conversion element is arranged in front of the traveling direction of the magnetic disk medium, and the electromagnetic conversion element is not included. Two contact pads are arranged in parallel rearward with respect to the traveling direction of the magnetic disk medium.

Further, the hardness of the damper layer is 1 to 1
It may be 0 GPa, and the material of the damper layer may be made of any one of fluororesin, porous SiO _{2 and} porous ZrO ₂ . The mass may be 0.1 g or less.

[0010]

By providing the damper layer between the contact pad formed at the tip of the magnetic head and the magnetic head slider, the impact force generated by the contact between the contact pad and the magnetic disk medium can be mitigated. Since the impact force is proportional to the product of the square of the velocity at the time of collision and the mass that moves by receiving the impact force, the impact force can be efficiently relieved by reducing this mass.

According to the present invention, only the contact pad is moved by the impact force so that the mass of the contact pad can be reduced. Further, by efficiently alleviating the impact force, it is possible to provide a contact type magnetic disk device having a high recording density and a high reliability while satisfying both suppression of jumping and reduction of abrasion damage.

[0012]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing the basic construction of an embodiment of the present invention. The contact type magnetic disk device of the present invention is
As shown in FIG. 1, an electromagnetic conversion element 1 for recording / reproducing on / from a magnetic disk medium 12, a contact pad 4 formed at the tip of this electromagnetic conversion element 1, an electromagnetic conversion element 1 and a contact pad 4 are mounted. The magnetic head slider 2 and the magnetic head slider support mechanism 6 that supports the magnetic head slider 2 are provided, and the damper layer 3 is provided between the magnetic head slider 2 and the contact pad 4. Further, the electrode 5 of the electromagnetic conversion element 1 is attached to the magnetic head slider 2.
, And an electrode (not shown) for connecting the lead wire 7 is provided near the base of the magnetic head slider support mechanism 6.

Magnetic head slider support mechanism 6 of this embodiment
Has a length of 10 mm, a width of 0.5 mm, and a thickness of 0.03.
A stainless steel having an elasticity of mm was used. In addition, the magnetic disk medium 12 is a magnetic recording carrier 1 on the base body 11.
0 is formed, and a protective film 9 and a lubricating layer 8 are further provided thereon. The magnetic disk medium 12 is configured to rotate in the direction of arrow A.

4 (a), 4 (b) and 5 are an exploded perspective view and a sectional view showing the details of the magnetic head slider 2, and FIG. 6 shows the magnetic field of the contact type magnetic disk device of the present invention. It is a perspective view showing a head slider support mechanism and a magnetic head slider.

As shown in FIGS. 4 (a) and 5, the magnetic head slider 2 used in the contact type magnetic disk device of the present invention has a diamond-shaped substrate 13 on which a hole is formed near the center. , Cu thin film coil 1
5 is formed and is covered with the insulating film 18. And
A yoke 14 made of Fe-Ni alloy is formed on the insulating film 18.
a is formed. This yoke 14a is also made of Fe.
It is connected to the return yoke 17 made of a -Ni alloy and forms a magnetic circuit that serves as a path for magnetic flux. Further, both ends of the coil 15 are connected to the electrodes 16.

The contact pad 4 has a structure in which a yoke penetrates through the central portion thereof, and as shown in FIG. 4B, a contact pad A21 processed with diamond and a yoke 14b in the central portion.
And a contact pad B22 in which the center line average roughness Rmax is about 0.5 nm after the two contact pads are bonded together and further fixed to the substrate 13 provided with the damper layer 3 with an adhesive or the like. It was manufactured by performing spherical polishing of.

As shown in FIG. 6, the magnetic head slider 2 thus manufactured has electrodes 23a and 23b on both ends.
Is fixed to the magnetic head slider support mechanism 6 having the Cu thin wiring film 19 provided with the adhesive by an adhesive or the like, the yoke 14a and the yoke 14b are connected, and as shown in FIG. Are connected to the electrodes 23a provided on the magnetic head slider support mechanism 6.

Here, FIG. 2 shows an example of the magnetic head slider 2 having one contact pad 4, and FIG. 3 shows an example of the magnetic head slider 2a having three contact pads 4a, 4b, 4c. Further, arrows B and C in the figure respectively indicate the rotating direction (traveling direction) of the magnetic disk medium.

Next, Examples 1 to 1 manufactured by changing the material and mass of the contact pad portion of the magnetic head slider
The contents of 10 will be described. In addition, Comparative Examples 1 to 4 were also produced in order to make a comparison with these Examples.

Example 1 The damper layer 3 is a substrate 13
Polytetrafluoroethylene having a thickness of 1 μm was formed on the above. This coating was formed by spraying fine particles of polytetrafluoroethiene powder and heating and melting.

Next, the magnetic disk medium 12 shown in FIG.
The magnetic recording carrier 10 is formed on a Cr underlayer 11 formed on a glass substrate (not shown). For this magnetic recording carrier 10, CoCrPt was formed into a film having a thickness of 30 nm by a sputtering method. The protective film 9 was formed by sputtering with carbon having 10% hydrogen added to a film thickness of 20 nm, and the lubricating layer 8 was formed by dipping with a film of perfluoropolyether having a film thickness of 3 nm.

The types and forming methods of the base 11, the magnetic recording carrier 10, the protective film 9 and the lubricating layer 8 used for the contact pad 4 and the magnetic disk medium 12 are not particularly limited, and they are known. The material and the forming method can be used without any particular limitation.

Example 2 As the damper layer 3, a perfluoroalkoxy fluororesin was used. Further, except for the material of the damper layer 3, the same procedure as in Example 1 was performed.

Example 3 As the damper layer 3, an ethylene tetrafluoride ethylene copolymer was used. Further, except for the material of the damper layer 3, the same procedure as in Example 1 was performed.

[Example 4] As the damper layer 3, vinylidene fluoride was used. Further, except for the material of the damper layer 3, the same procedure as in Example 1 was performed.

Example 5 As the damper layer 3, polychlorotrifluoroethylene was used. Also, the damper layer 3
The materials other than the above materials were the same as in Example 1.

[Example 6] As the damper layer 3, vinyl fluoride was used. Further, except for the material of the damper layer 3, the same procedure as in Example 1 was performed.

[Example 7] As the damper layer 3, porous (porous) SiO ₂ was used. This porous SiO
The production method of ₂ was performed as follows. First, a film was formed by a dip method using a sol-gel method using tetraethoxysilicate as a raw material, and then a film having a thickness of 1 μm was formed by a freeze-drying method. In addition, except for the material of the damper layer 3, Example 1
Same as.

Example 8 As the damper layer 3, porous (porous) ZrO ₂ was used. This porous ZrO
The manufacturing method of ₂ was the same as that of Example 7. Also,
The same procedure as in Example 1 was performed except for the material of the damper layer 3.

[Example 9] The damper layer 3 was formed in the same manner as in Example 1. However, the contact pads are, as shown in FIG. 3, contact pads 4a, 4 having three contact pads.
The contact pad 4a including the electromagnetic conversion elements (not shown) is arranged forward with respect to the traveling direction (direction of arrow C) of the magnetic disk medium (not shown). The contact pads 4b and 4c not included were arranged in parallel rearward with respect to the traveling direction of the magnetic disk medium.

[Embodiment 10] The damper layer 3 of Embodiment 1 is used.
It was formed in the same manner as. However, the mass of the contact pad was set to 0.1 g.

Next, as a comparative example for comparison with these examples, the following contact pad portion was also produced.

[Comparative Example 1] A material having no damper layer 3 was used. This manufacturing method and material were the same as in Example 1 except that no damper layer was provided.

[Comparative Example 2] As the damper layer 3, sputtered SiO ₂ was used. The manufacturing method and material were the same as in Example 1 except for the damper layer.

Comparative Example 3 The damper layer 3 was formed in the same manner as in Example 1. However, the mass of the contact pad was set to 0.5 g.

Comparative Example 3 The damper layer 3 was formed in the same manner as in Example 1. However, the mass of the contact pad was set to 1.0 g.

A sliding durability test was conducted using the magnetic head slider manufactured as described above. The rotation speed of the magnetic disk medium during this sliding durability test was 5400 rpm. Further, the average wear thickness of the magnetic disk medium surface after 2000 hours of the sliding test and the maximum jump amount in the steady sliding state were obtained.

Here, the maximum jump amount does not always mean that the magnetic head slider and the magnetic disk medium are in contact with each other during the sliding durability test, and indicates a jump due to an abnormal protrusion on the surface of the magnetic disk medium. In this case, this is obtained as the maximum jump amount, and this jump amount is measured by irradiating a laser beam on the back surface of the magnetic head slider using a laser Doppler vibrometer (LDV) and changing the frequency of the reflected light. Observed, the velocity was measured, and further, it was converted into displacement by integration and determined. Further, two laser Doppler vibrometers were used to measure displacements at two positions on the back surface of the magnetic head slider, and the size of the roll angle (direction of arrow D in FIG. 2) was obtained.

Next, Examples 1 to 10 and Comparative Examples 1 to 3
Table 1 shows the results of the sliding durability test conducted using.

[0041]

[Table 1]

According to Table 1, in all of Examples 1 to 10, the average wear thickness and the maximum jump amount are significantly smaller than those of Comparative Example 1 in which the damper layer is not provided. Has become. That is, by providing the damper layer, it is possible to satisfy the requirements for jumping and abrasion damage at the same time, and to provide a highly reliable contact type magnetic disk device with a high recording density.

Next, an embodiment 9 in which three contact pads are provided.
And Example 1 in which the contact pad is one, the average wear thickness and the maximum jump amount are further smaller, and the roll angle is significantly smaller than the other Examples. I understand. As a result, of the three contact pads provided on the magnetic head slider surface, one contact pad including the electromagnetic conversion element is arranged in front of the traveling direction of the magnetic disk medium and two contact pads including no electromagnetic conversion element are arranged. The performance can be further improved by disposing the contact pads in parallel rearward with respect to the traveling direction of the magnetic disk medium.

Looking at Examples and Comparative Examples in which the mass of the contact pad portion was changed, Examples 1 and 10 were obtained.
From the result of, when the mass of the contact pad part is 0.1 g or less,
Although the values of the average wear thickness and the maximum jump amount are small, from the results of Comparative Example 3 and Comparative Example 4, when the mass of the contact pad portion is 0.5 g or 1.0 g, the values of the average wear thickness and the maximum jump amount are It can be seen that From this result, the effect of the damper layer is significantly exhibited when the mass of the contact pad portion is 0.1 g or less.

Further, paying attention to the hardness of the contact pad portion, the hardness of the contact pad portion is 1 G in all the examples.
Although it is in the range of Pa to 10 GPa, when a damper layer having a hardness greater than 10 GPa is provided as in Comparative Example 2, the average wear thickness and the maximum jump amount are large. That is, the hardness of the damper layer is 1 GPa to 1
It can be seen that 0 GPa is an appropriate range.

Therefore, the contact type magnetic disk device of the present invention has an average wear thickness of at least a fraction to a few hundreds and a fraction to a few as compared with the conventional contact type magnetic disk device. It is possible to achieve a maximum jump of one tenth,
The durability was at least tripled as a whole, and high reliability could be secured. Further, by using the contact type magnetic disk device of the present invention, it was possible to obtain a linear recording density four times that of the conventional one.

[0047]

As described above, the tactile magnetic disk device of the present invention efficiently provides an impact force by providing the damper layer between the contact pad formed at the tip of the magnetic head and the magnetic head slider. Can be relaxed. Further, the contact pad has three contact points, the damper layer has a hardness of 1 to 10 GPa, the damper layer is a fluororesin, porous SiO ₂ or porous ZrO.
Even when using the one consisting of ₂ , the amount of wear and the amount of jump can be kept small, the wear damage of the magnetic head and the magnetic disk medium is reduced, the durability and reliability of the device are improved, and a high recording density is achieved. The effect is that you can do it.

[Brief description of drawings]

FIG. 1 is a sectional view showing a basic configuration of an embodiment of the present invention.

FIG. 2 is applied to the contact type magnetic disk device of the present invention 1
It is a partial perspective view which shows the example of the magnetic head slider which has one contact pad.

FIG. 3 is applied to the contact type magnetic disk device of the present invention 3
It is a partial perspective view which shows the example of the magnetic head slider which has one contact pad.

FIG. 4 is an exploded perspective view showing details of a magnetic head slider of the contact type magnetic disk device of the present invention.

FIG. 5 is a sectional view of FIG. 4;

FIG. 6 is a perspective view showing a magnetic head slider support mechanism and a magnetic head slider of the contact type magnetic disk device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic conversion element 2, 2a Magnetic head slider 3 Damper layer 4, 4a, 4b, 4c Contact pad 5, 16, 23a, 23b Electrode 6 Magnetic head slider support mechanism 7 Lead wire 8 Lubricating layer 9 Protective film 10 Magnetic recording carrier 11 Underlayer 12 Magnetic Disk Medium 13 Substrate 14a, 14b Yoke 15 Coil 17 Return Yoke 18 Insulating Film 19 Wiring Film 20 Wire 21 Contact Pad A 22 Contact Pad B

Claims (5)

[Claims] 1. A contact pad having an electromagnetic conversion element for recording / reproducing formed at its tip and slidingly contacting a magnetic disk medium, and a magnetic head slider having the contact pad mounted thereon.
In a contact-type magnetic disk device including a magnetic head slider support mechanism that supports this magnetic head slider,
A contact-type magnetic disk device comprising a damper layer between the magnetic head slider and the contact pad. 2. The contact pad comprises three contact pads, one contact pad including the electromagnetic conversion element is arranged in front of the traveling direction of the magnetic disk medium, and the electromagnetic conversion element is not included. 2. The contact type magnetic disk device according to claim 1, wherein two contact pads are arranged in parallel rearward with respect to the traveling direction of the magnetic disk medium. 3. The hardness of the damper layer is 1 to 10 GP.
3. The contact type magnetic disk device according to claim 1, wherein the contact type magnetic disk device is a. 4. The damper layer according to claim 1, wherein the damper layer is made of any one of fluororesin, porous (porous) SiO _{2 and} porous ZrO ₂ . Contact type magnetic disk device. 5. The contact type magnetic disk device according to claim 1, wherein the contact pad has a mass of 0.1 g or less.