Air bearing surface of a head slider in a hard disk drive
View Patent ↗A head slider for supporting a head over a magnetic disk in a hard disk drive, and a method of making the head slider are disclosed. The air bearing surface (ABS) of the head slider includes a relatively deep recess in front of a trailing pad and an island pad. A recess is formed between the trailing pad and the island pad of the ABS. In operation, the recess may reduce the peak pressure of the ABS, resulting in a reduced mid disk (MD) hump without a reduction in other performance parameters. The reduction in peak pressure may also reduce lubrication pick-up from the magnetic disk.
1. A head slider for supporting a magnetic head above a surface of a magnetic storage disk in a hard disk drive, the head slider comprising:
a leading edge;
a trailing edge;
a transverse channel disposed between the leading edge and the trailing edge;
first and second side edges extending between the leading and trailing edges;
an air bearing surface (ABS), comprising:
a trailing pad comprising:
a rear portion adjacent the trailing edge of the slider;
first and second arms extending from the rear portion toward the leading edge of the slider and forming a channel there between, wherein the first and second arms are connected to the trailing pad; and
an island pad between the first and second arms, wherein the island pad is in the same plane as the ABS; and
the head slider further comprising a recess formed between the first and second arms and between the island pad and the rear portion of the trailing pad, wherein the recess extends to a depth below the air bearing surface that is greater than a depth the transverse channel is below the air bearing surface.
2. The head slider of claim 1 wherein the recess has a bottom surface that is between 10 nm and 10 μm below a top surface of the pads.
3. The head slider of claim 1 wherein the recess has a top with a first area, a bottom surface with a second area and side surfaces, and the side surfaces are tapered, such that the first area is greater than the second area.
4. A head slider for supporting a magnetic head above a surface of a magnetic storage disk in a hard disk drive, the head slider comprising:
a leading edge;
a trailing edge;
first and second side edges extending between the leading and trailing edges; and
an air bearing surface (ABS), comprising:
a trailing pad comprising a rear portion adjacent the trailing edge of the slider; and first and second arms extending from the rear portion toward the leading edge of the slider and forming a channel there between;
an island pad between the first and second arms; and
a recess formed between the first and second arms and between the island pad and the rear portion of the trailing pad, wherein the recess comprises:
a first portion, the first portion having a first bottom surface;
a second portion, the second portion having a second bottom surface; and
a third portion the third portion having a third bottom surface; wherein
the first and second bottom surfaces are a first distance below a top surface of the pads;
the third bottom surface is a second distance below the top surface of the pads, the second distance being less than the first distance; and
the third portion is between the first and second portions.
5. The head slider of claim 4 wherein the first distance is between 10 nm and 10 μm and the second distance is between 10 nm and 10 μm.
6. A head slider for supporting a magnetic head above a surface of a magnetic storage disk in a hard disk drive, the head slider comprising:
a leading edge;
a trailing edge;
first and second side edges extending between the leading and trailing edges; and
an air bearing surface (ABS), comprising:
a trailing pad comprising a rear portion adjacent the trailing edge of the slider; and first and second arms extending from the rear portion toward the leading edge of the slider and forming a channel there between;
an island pad between the first and second arms; and
a recess formed between the first and second arms and between the island pad and the rear portion of the trailing pad, wherein the recess has a top with a first area, a bottom surface with a second area and side surfaces, and the side surfaces are vertical, such that the first area is substantially equal to the second area.
7. A hard disk drive having a magnetic storage disk and a head slider for supporting a magnetic head above a surface of the magnetic storage disk, the head slider comprising:
a leading edge;
a trailing edge;
a transverse channel disposed between the leading edge and the trailing edge;
first and second side edges;
an air bearing surface (ABS) facing, and adjacent to, the surface of the disk, the ABS comprising:
a trailing pad comprising:
a rear portion adjacent the trailing edge of the slider;
first and second arms extending from the rear portion toward the leading edge of the slider and forming a channel there between, wherein the first and second arms are connected to the trailing pad; and
an island pad between the first and second arms, wherein the island pad is in the same plane as the ABS; and
the head slider further comprising a recess between the first and second arms and between the island pad and the rear portion of the trailing pad, wherein the recess extends to a depth below the air bearing surface that is greater than a depth the transverse channel is below the air bearing surface.
8. The hard disk drive of claim 7 wherein the recess has a bottom surface that is between 10 nm and 10 μm below a top surface of the pads.
9. The hard disk drive of claim 7 , wherein the recess has a top with a first area, a bottom surface with a second area and side surfaces, and the side surfaces are tapered, such that the first area is greater than the second area.
10. A hard disk drive having a magnetic storage disk and a head slider for supporting a magnetic head above a surface of the magnetic storage disk, the head slider comprising:
a leading edge;
a trailing edge;
first and second side edges; and
an air bearing surface (ABS) facing, and adjacent to, the surface of the disk, the ABS comprising:
a trailing pad comprising a rear portion adjacent the trailing edge of the slider; and first and second arms extending from the rear portion toward the leading edge of the slider and forming a channel there between;
an island pad between the first and second arms; and
a recess between the first and second arms and between the island pad and the rear portion of the trailing pad, wherein the recess comprises:
a first portion, the first portion having a first bottom surface;
a second portion, the second portion having a second bottom surface; and
a third portion the third portion having a third bottom surface; wherein
the first and second bottom surfaces are a first distance below a top surface of the pads;
the third bottom surface is a second distance below the top surface of the pads, the second distance being less than the first distance; and
the third portion is between the first and second portions.
11. The hard disk drive of claim 10 wherein the first distance is between 10 nm and 10 μm and the second distance is between 10 nm and 10 μm.
12. A hard disk drive having a magnetic storage disk and a head slider for supporting a magnetic head above a surface of the magnetic storage disk, the head slider comprising:
a leading edge;
a trailing edge;
first and second side edges; and
an air bearing surface (ABS) facing, and adjacent to, the surface of the disk, the ABS comprising:
a trailing pad comprising a rear portion adjacent the trailing edge of the slider; and first and second arms extending from the rear portion toward the leading edge of the slider and forming a channel there between;
an island pad between the first and second arms; and
a recess between the first and second arms and between the island pad and the rear portion of the trailing pad, wherein the recess has a top with a first area, a bottom surface with a second area and side surfaces, and the side surfaces are vertical, such that the first area is substantially equal to the second area.