Magnetic head slider and disk drive with reduced damage to recording medium
View Patent ↗Embodiments of the invention reduce damage to a disk recording medium when a slider flying above the disk recording medium inside a magnetic disk drive comes into contact with the disk recording medium due to slider vibration. In one embodiment, a magnetic head slider includes a front pad, a rear pad, and carbon protective films. The front pad includes a step bearing surface disposed on the side of a leading end and leading side rail surfaces formed on the step bearing surface. The rear pad includes a rear step bearing surface disposed across a deep groove surface from the front pad and a trailing side rail surface formed on the rear step bearing surface. The carbon protective films are formed on regions including vertices of slider corner portions, respectively. The leading side rail surfaces and the trailing side rail surface are formed substantially on the same level. The carbon protective films are harder than a slider base material and have a small coefficient of friction. The films have a film thickness of about 10 nm or more.
1. A magnetic head slider having a magnetic transducer for writing and reading data to and from a spinning disk, the magnetic head slider comprising:
a damage preventive protective film which has a smaller coefficient of friction than a slider base material and a film thickness of about 10 nm or more, and which is formed on slider corner portions on a side of an air bearing surface on a side of a leading end, and/or on corner portions, on a side of a trailing end, of a rear pad on which the magnetic transducer is disposed; and
one or a plurality of leading side rail surfaces formed on a step bearing surface,
wherein a step surface is formed on the leading side rail surface, the step surface having a predetermined height H from the leading side rail surface and being formed continuously in a direction from the leading end toward the trailing end, and
wherein the damage preventive protective film has a film thickness equal to the predetermined height H.
2. The magnetic head slider according to claim 1 , further comprising:
a front pad including a step bearing surface disposed on a surface of the base material on a side of the leading end and one or a plurality of leading side rail surfaces formed on the step bearing surface; and
a rear pad including a rear step bearing surface disposed on the surface of the base material on the trailing end and across the front pad and a negative pressure generating deep groove surface, and a trailing side rail surface formed on the rear step bearing surface;
wherein the leading side rail surface and the trailing side rail surface are formed on substantially the same level;
wherein the step bearing surface and the rear step bearing surface are formed with a predetermined depth from the leading side rail surface and the trailing side rail surface; and
wherein the damage preventive protective film has a film thickness equal to the predetermined depth or less.
3. The magnetic head slider according to claim 2 , further comprising:
a leading pad disposed near respective vertices of the slider corner portions on the step bearing surface on the side of the leading end;
wherein the damage preventive protective film is formed in a region including a top surface of the leading pad.
4. The magnetic head slider according to claim 3 , comprising:
deep groove surfaces formed on both sides of the front pad to include the corresponding slider corner portions in a direction from the leading end toward the trailing end and to have a depth substantially the same as the negative pressure generating deep groove surface;
wherein the damage preventive protective film is formed on a region including each of the respective deep groove surfaces on the slider corner portions.
5. The magnetic head slider according to claim 4 ,
wherein the damage preventive protective film is formed continuously or intermittently along the leading end of the front pad.
6. The magnetic head slider according to claim 4 ,
wherein the step bearing surface includes a front step bearing surface and a side step bearing surface, and the side step bearing surface is formed to extend up to a point near the trailing end; and
wherein the damage preventive protective film is formed on a region including each of the vertices of the slider corner portions and the trailing end of the side step bearing surface.
7. The magnetic head slider according to claim 3 ,
wherein the damage preventive protective film is formed continuously or intermittently along the leading end of the front pad.
8. The magnetic head slider according to claim 3 ,
wherein the step bearing surface includes a front step bearing surface and a side step bearing surface, and the side step bearing surface is formed to extend up to a point near the trailing end; and
wherein the damage preventive protective film is formed on a region including each of the vertices of the slider corner portions and the trailing end of the side step bearing surface.
9. The magnetic head slider according to claim 2 ,
wherein the damage preventive protective film is formed continuously or intermittently along the leading end of the front pad.
10. The magnetic head slider according to claim 2 ,
wherein the step bearing surface includes a front step bearing surface and a side step bearing surface, and the side step bearing surface is formed to extend up to a point near the trailing end; and
wherein the damage preventive protective film is formed on a region including each of the vertices of the slider corner portions and the trailing end of the side step bearing surface.
11. The magnetic head slider according to claim 2 , comprising:
deep groove surfaces formed on both sides of the front pad to include the corresponding slider corner portions in a direction from the leading end toward the trailing end and to have a depth substantially the same as the negative pressure generating deep groove surface;
wherein the damage preventive protective film is formed on each of the respective deep groove surfaces on the slider corner portions.
12. The magnetic head slider according to claim 1 ,
wherein the damage preventive protective film has a value of Vickers hardness of 3000 Hv or higher.
13. A magnetic head slider having a magnetic transducer for writing and reading data to and from a spinning disk, the magnetic head slider comprising:
a damage preventive protective film which has a higher hardness than a slider base material and a film thickness of about 10 nm or more, and which is formed on slider corner portions on a side of an air bearing surface on a side of a leading end, and/or on corner portions, on a side of a trailing end, of a rear pad on which the magnetic transducer is disposed; and
one or a plurality of leading side rail surfaces formed on the a step bearing surface,
wherein a step surface is formed on the leading side rail surface, the step surface having a predetermined height H from the leading side rail surface and being formed continuously in a direction from the leading end toward the trailing end, and
wherein the damage preventive protective film has a film thickness equal to the predetermined height H.
14. The magnetic head slider according to claim 13 , further comprising:
a front pad including a step bearing surface disposed on a surface of the base material on a side of the leading end and one or a plurality of leading side rail surfaces formed on the step bearing surface; and
a rear pad including a rear step bearing surface disposed on the surface of the base material on the trailing end and across the front pad and a negative pressure generating deep groove surface, and a trailing side rail surface formed on the rear step bearing surface;
wherein the leading side rail surface and the trailing side rail surface are formed on substantially the same level;
wherein the step bearing surface and the rear step bearing surface are formed with a predetermined depth from the leading side rail surface and the trailing side rail surface; and
wherein the damage preventive protective film has a film thickness equal to the predetermined depth or less.
15. The magnetic head slider according to claim 14 , further comprising:
a leading pad disposed near respective vertices of the slider corner portions on the step bearing surface on the side of the leading end;
wherein the damage preventive protective film is formed in a region including a top surface of the leading pad.
16. The magnetic head slider according to claim 15 , comprising:
deep groove surfaces formed on both sides of the front pad to include the corresponding slider corner portions in a direction from the leading end toward the trailing end and to have a depth substantially the same as the negative pressure generating deep groove surface;
wherein the damage preventive protective film is formed on a region including each of the respective deep groove surfaces on the slider corner portions.
17. The magnetic head slider according to claim 16 , wherein the damage preventive protective film is formed continuously or intermittently along the leading end of the front pad.
18. The magnetic head slider according to claim 16 ,
wherein the step bearing surface includes a front step bearing surface and a side step bearing surface, and the side step bearing surface is formed to extend up to a point near the trailing end; and
wherein the damage preventive protective film is formed on a region including each of the vertices of the slider corner portions and the trailing end of the side step bearing surface.
19. The magnetic head slider according to claim 15 ,
wherein the damage preventive protective film is formed continuously or intermittently along the leading end of the front pad.
20. The magnetic head slider according to claim 15 ,
wherein the step bearing surface includes a front step bearing surface and a side step bearing surface, and the side step bearing surface is formed to extend up to a point near the trailing end; and
wherein the damage preventive protective film is formed on a region including each of the vertices of the slider corner portions and the trailing end of the side step bearing surface.
21. The magnetic head slider according to claim 14 ,
wherein the damage preventive protective film is formed continuously or intermittently along the leading end of the front pad.
22. The magnetic head slider according to claim 14 ,
wherein the step bearing surface includes a front step bearing surface and a side step bearing surface, and the side step bearing surface is formed to extend up to a point near the trailing end; and
wherein the damage preventive protective film is formed on a region including each of the vertices of the slider corner portions and the trailing end of the side step bearing surface.
23. The magnetic head slider according to claim 14 , comprising:
deep groove surfaces formed on both sides of the front pad to include the corresponding slider corner portions in a direction from the leading end toward the trailing end and to have a depth substantially the same as the negative pressure generating deep groove surface;
wherein the damage preventive protective film is formed on each of the respective deep groove surfaces on the slider corner portions.
24. The magnetic head slider according to claim 13 ,
wherein the damage preventive protective film has a value of Vickers hardness of 3000 Hv or higher.
25. A magnetic disk drive, comprising:
a spinning disk;
a magnetic head slider including a magnetic transducer for writing and reading data to and from the disk;
a suspension configured to hold the magnetic head slider;
an arm configured to support the suspension; and
a driving portion configured to drive the arm;
wherein the magnetic head slider includes a damage preventive protective film which has a smaller coefficient of friction than a slider base material and a film thickness of about 10 nm or more, and which is formed on slider corner portions on a side of an air bearing surface on a side of a leading end, and/or on corner portions, on a side of a trailing end, of a rear pad on which the magnetic transducer is disposed, the magnetic head slider further comprising
one or a plurality of leading side rail surfaces formed on a step bearing surface,
wherein a step surface is formed on the leading side rail surface, the step surface having a predetermined height H from the leading side rail surface and being formed continuously in a direction from the leading end toward the trailing end, and
wherein the damage preventive protective film has a film thickness equal to the predetermined height H.
26. The magnetic disk drive according to claim 25 , wherein the magnetic head slider comprises:
a front pad including a step bearing surface disposed on a surface of the base material on a side of a leading end and one or a plurality of leading side rail surfaces formed on the step bearing surface; and
a rear pad including a rear step bearing surface disposed on the surface of the base material on a trailing end and across the front pad and a negative pressure generating deep groove surface, and a trailing side rail surface formed on the rear step bearing surface;
wherein the leading side rail surface and the trailing side rail surface are formed on substantially the same level;
wherein the step bearing surface and the rear step bearing surface are formed with a predetermined depth from the leading side rail surface and the trailing side rail surface; and
wherein the damage preventive protective film has a film thickness equal to the predetermined depth or less.