Patterned magnetic recording head having a gap pattern with substantially elliptical or substantially diamond-shaped termination pattern
A thin-film magnetic recording head utilizing a timing based servo pattern is fabricated by sputtering a magnetically permeable thin film onto a substrate. A gap pattern, preferably a timing based pattern, is defined by the thin film. The gap pattern includes termination patterns or endpoints that are elliptical or diamond-shaped.
1. A magnetic recording head for generating servo tracks on a magnetic medium, the magnetic recording head comprising:
a substrate having a generally planar first surface;
a magnetically-permeable thin film disposed on the first surface; and
a gap pattern defined by the thin film, the gap pattern having at least one termination pattern, the termination pattern being at least one of substantially elliptical or substantially diamond-shaped.
2. The device of claim 1 , wherein the gap has nearly parallel side walls.
3. The device of claim 1 , wherein the termination pattern is substantially elliptical and has a length that is non-orthogonal to a width of the gap pattern.
4. The device of claim 1 , wherein the termination pattern is substantially elliptical and has a length substantially orthogonal to the width of the gap pattern.
5. The device of claim 1 , wherein the gap pattern is formed by removing a portion of the thin film using a focused ion beam oriented in a plane perpendicular to the plane of the first surface.
6. The device of claim 1 , wherein the gap pattern is a timing-based servo pattern.
7. The device of claim 1 , wherein the gap pattern is an amplitude-based servo pattern.
8. A gap pattern for a magnetic recording head, the gap pattern comprising a pair of non-parallel, longitudinally extending gaps having a width and terminating in at least one termination pattern, wherein the shape of the termination pattern comprises at least one of an ellipse and a diamond.
9. The gap pattern of claim 8 , wherein the shape of the termination pattern is an ellipse having a length that is non-orthogonal to the width of the gaps.
10. The gap pattern of claim 8 , wherein the shape of the termination pattern is an ellipse having a length substantially perpendicular to the width of the gaps.
11. The gap pattern of claim 8 , wherein the shape of the termination pattern is a diamond, wherein the outside corners of the diamond are rounded.
12. The gap pattern of claim 11 , wherein the rounded corners correspond to a circle having a diameter of from about 10% to about 50% of the length of a side of the termination pattern.
13. The gap pattern of claim 12 , wherein the rounded corners correspond to a circle having a diameter of about 30% of the length of a side of the termination pattern.
14. The gap pattern of claim 8 , wherein the gap pattern is a timing-based servo pattern.
15. The gap pattern of claim 8 , wherein the gap pattern is an amplitude-based servo pattern.
16. Magnetic media imprinted with a servo pattern comprising a plurality of gap patterns which comprise a pair of non-parallel, longitudinally extending gaps having a width, and terminating at least one gap pattern with at least one termination pattern, wherein a width of the termination pattern is greater than the width of the longitudinally extending gap of the at least one gap pattern terminated with the at least one termination pattern.
17. The magnetic media of claim 16 , wherein the termination pattern is generally elliptical.
18. The magnetic media of claim 16 , wherein the termination pattern is generally diamond-shaped.
19. The magnetic media of claim 16 , wherein the servo pattern is a timing-based servo pattern.