Writer having a recessed trailing shield and nonmagnetic refill
View Patent ↗A magnetic apparatus has a media-facing surface (MFS), a pole, a write gap at the MFS, a trailing shield, coil(s) and a nonmagnetic refill material. The pole includes a pole tip proximate to the MFS. The trailing shield includes a pedestal and a recessed portion. The pedestal occupies a portion of the MFS. The recessed portion has a front surface at an acute angle from the MFS and is recessed from the MFS by a distance of not more than 0.8 micrometers. The write gap is between the pedestal and the pole tip. The coil(s) energize the pole and have at least one turn. The coil(s) are between the recessed portion of the trailing shield and the pole. The trailing shield is between the nonmagnetic refill material and the pole. A portion of the nonmagnetic refill material is between the recessed portion and the MFS.
1. A magnetic write apparatus having a media-facing surface (MFS), the magnetic write apparatus comprising:
a pole;
a write gap at the MFS positioned directly over the pole;
a trailing shield comprising a pedestal portion and a recessed portion, the pedestal portion occupying a portion of the MFS and further comprising a bottom portion directly over the write gap and a top portion directly over the bottom portion, wherein a saturation magnetization of the bottom portion is greater than a saturation magnetization of the top portion, wherein the top portion and the bottom portion extend to the MFS, the recessed portion having a front surface recessed from the MFS, wherein the bottom portion further comprises a first portion extending from and perpendicular to the MFS and a back surface recessed from the MFS and at an angle with a plane extending parallel to the MFS;
at least one coil for energizing the pole, the at least one coil between the recessed portion of the trailing shield and the pole, wherein the bottom portion does not extend over the at least one coil; and
a nonmagnetic refill material, the trailing shield being between the nonmagnetic refill material and the pole, a portion of the nonmagnetic refill material being between the recessed portion and the MFS.
2. The magnetic write apparatus of claim 1 wherein the trailing shield has a first lapping rate, the nonmagnetic refill material has a second lapping rate and the first lapping rate is substantially equal to the second lapping rate.
3. The magnetic write apparatus of claim 1 wherein the portion of the nonmagnetic refill material that is between the recessed portion and the MFS is recessed from the MFS.
4. The magnetic write apparatus of claim 3 , wherein the nonmagnetic refill material that is between the recessed portion and the MFS is recessed from the MFS by no more than five nanometers.
5. The magnetic write apparatus of claim 1 wherein the portion of the nonmagnetic refill material that is between the recessed portion and the MFS occupies a portion of the WS.
6. The magnetic write apparatus of claim 1 wherein the front surface of the recessed portion forms an acute angle with a plane extending parallel to the MFS.
7. The magnetic write apparatus of claim 1 wherein the front surface of the recessed portion is substantially parallel to the MFS.
8. The magnetic write apparatus of claim 1 , wherein the bottom portion of the pedestal portion has a thickness in a down track direction that is less than a thickness of the top portion in the down track direction.
9. The magnetic write apparatus of claim 1 , wherein the top portion extends farther away from the MFS than the bottom portion.
10. The magnetic write apparatus of claim 9 , wherein part of the top portion that extends farther away from the bottom portion is separated from the pole by the write gap only.
11. The magnetic write apparatus of claim 1 , wherein the top portion has a nominal thickness of 0.8 microns.
12. The magnetic write apparatus of claim 1 , wherein the saturation magnetization of the bottom portion is 2.0T and the saturation magnetization of the top portion is 1.6T.
13. The magnetic write apparatus of claim 1 , further comprising an auxiliary pole on a leading side of the pole and recessed from the MFS, and wherein a back surface of the pole and a back surface of the auxiliary pole are at substantially same distance from the MFS.
14. The magnetic write apparatus of claim 1 , wherein the front surface of the recessed portion is recessed from the MFS by at least 0.2 micrometers and not more than 0.6 micrometers.
15. A data storage device comprising:
a media; and
a slider having a media-facing surface (MFS), the slider comprising a pole, a write gap positioned directly over the pole, a trailing shield, at least one coil, and a nonmagnetic refill material, the trailing shield comprising a pedestal portion and a recessed portion, the pedestal portion occupying a portion of the MFS and further comprising a bottom portion directly over the write gap and a top portion directly over the bottom portion, wherein a saturation magnetization of the bottom portion is greater than a saturation magnetization of the top portion, wherein the top portion and the bottom portion extend to the MFS, the recessed portion having a front surface recessed from the MFS, the at least one coil for energizing the pole and located between the recessed portion of the trailing shield and the pole, wherein the bottom portion does not extend over the at least one coil and comprises a first portion extending from and perpendicular to the MFS and a back surface recessed from the MFS and at an angle with a plane extending parallel to the MFS, the trailing shield being between the nonmagnetic refill material and the pole, a portion of the nonmagnetic refill material being between the recessed portion and the MFS.
16. The data storage device of claim 15 wherein the trailing shield has a first lapping rate, the nonmagnetic refill material has a second lapping rate and the first lapping rate is substantially equal to the second lapping rate.
17. The data storage device of claim 15 wherein the nonmagnetic refill material is a nonmagnetic metal.
18. The data storage device of claim 17 wherein the nonmagnetic metal is NiP.
19. The data storage device of claim 15 wherein the nonmagnetic refill material is aluminum oxide.
20. The data storage device of claim 15 wherein the front surface of the recessed portion forms an acute angle with a plane extending parallel to the MFS.