Magnetic writer having convex trailing surface pole and conformal write gap
A magnetic write apparatus has a media-facing surface (MFS), a pole, a write gap, a top shield and coil(s). The pole includes a yoke and a pole tip. The pole tip includes a bottom, a top wider than the bottom and first and second sides. The pole tip has a height between the top and the bottom. At least part of the top of the pole tip is convex in a cross-track direction between the first and second sides such that the height at the MFS is larger between the first and second sides than at the first and second sides. The height increases in a yoke direction perpendicular to the MFS. The write gap is adjacent to and conformal with the top of the pole at the MFS and is between part of the top shield and the pole. The top shield is concave at the MFS.
1. A magnetic write apparatus having a media-facing surface (MFS), the magnetic write apparatus comprising:
a pole having a yoke and a pole tip between the yoke and the MFS, the pole tip including a bottom, a top wider than the bottom, a first side and a second side, the pole tip having a height between the top and the bottom, at least a portion of the top of the pole tip being convex in a cross-track direction between the first side and the second side such that the height of the pole tip is larger between the first side and the second side than at the first side and at the second side, the top of the pole tip being beveled such that the height increases in a yoke direction perpendicular to the MFS,
wherein an angle between the top and a plane along the cross-track direction at the MFS is substantially equal to an angle between the top and the plane along the cross-track direction at a position recessed from the MFS.
2. The magnetic write apparatus of claim 1 further comprising:
a top shield separated from the top of the pole by a write gap; and
at least one side shield separated from the first side and the second side of the pole by a side gap.
3. The magnetic write apparatus of claim 1 wherein the top is a convex curved surface.
4. The magnetic write apparatus of claim 1 wherein the top is a convex peaked surface.
5. The magnetic write apparatus of claim 1 wherein a location of a largest height of the pole tip at the MFS is evenly spaced between the first side and the second side.
6. The magnetic write apparatus of claim 1 wherein a largest height of the pole tip at the MFS is closer to the first side than the second side.
7. The magnetic write apparatus of claim 1 wherein the angle between the top and the plane along the cross-track direction at the MFS and the angle between the top and the plane along the cross-track direction at the position recessed from the MFS are greater than zero degrees and not more than twenty degrees.
8. The magnetic write apparatus of claim 7 wherein the angles are at least five degrees and not more than ten degrees.
9. The magnetic write apparatus of claim 1 wherein the pole has a width between the first side and the second side in the cross-track direction, the width increasing for the pole tip in the yoke direction from the MFS.
10. The magnetic write apparatus of claim 1 wherein the pole tip has a width between the first side and the second side in a cross-track direction at the MFS, the width being at least forty and not more than sixty nanometers, and wherein the tallest portion is not more than one hundred nanometers.
11. A data storage device comprising:
a slider comprising a magnetic write apparatus, the magnetic write apparatus comprising a pole, the pole comprising a yoke and a pole tip between the yoke and a media facing surface (MFS), the pole tip comprising a bottom, a top wider than the bottom, a first side and a second side, wherein at least a portion of the top of the pole tip is convex in a cross-track direction, and the top of the pole tip is beveled such that a height of the pole tip between the top and the bottom of the pole increases in a yoke direction perpendicular to the MFS,
wherein an angle between the top and a plane along the cross-track direction at the MFS is substantially equal to an angle between the top and the plane along the cross-track direction at a position recessed from the MFS.
12. The data storage device of claim 11 wherein the top has a shape selected from a convex curved surface and a convex peaked surface.
13. The data storage device of claim 11 wherein the angle between the top and the plane along the cross-track direction at the MFS and the angle between the top and the plane along the cross-track direction at the position recessed from the MFS are at least five degrees and not more than ten degrees.
14. The data storage device of claim 13 wherein the pole has a width between the first side and the second side in the cross-track direction, the width increasing for the pole tip in the yoke direction from the MFS.
15. A method for fabricating a magnetic write apparatus having a media-facing surface (MFS), the method comprising:
providing a pole having a yoke and a pole tip between the yoke and the MFS, the pole tip comprising a bottom, a top wider than the bottom, a first side and a second side, the pole tip having a height between the top and the bottom, at least a portion of the top of the pole tip being convex in a cross-track direction between the first side and the second side such that the height of the pole tip at the MFS is larger between the first side and the second side than at the first side and at the second side, the top of the pole tip being beveled such that the height increases in a yoke direction perpendicular to the MFS, wherein an angle between the top and a plane along the cross-track direction at the MFS is substantially equal to an angle between the top and the plane along the cross-track direction at a position recessed from the MFS;
providing a write gap adjacent to and conformal with the top of the pole at the MFS; and
providing a top shield, the write gap being between a portion of the top shield and the top of the pole, the portion of the top shield being concave at the MFS.
16. The method of claim 15 wherein the write gap further comprises an overhang extending beyond a side gap separating the first side and the second side of the pole from a side shield.
17. The method of claim 15 wherein a location of a largest height of the pole tip is evenly spaced between the first side and the second side.
18. The method of claim 15 wherein the angle between the top and the plane along the cross-track direction at the MFS and the angle between the top and the plane along the cross-track direction at the position recessed from the MFS are at least five degrees and not more than ten degrees.
19. The method of claim 18 wherein the pole has a width between the first side and the second side in the cross-track direction, the width increasing for the pole tip in the yoke direction from the MFS.