MAMR stack shape optimization for magnetic recording
The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a main pole, a trailing shield, and a MAMR stack including at least one magnetic layer. The magnetic layer has a surface facing the main pole, and the surface has a first side at a media facing surface (MFS) and a second side opposite the first side. The length of the second side is substantially less than the length of the first side. By reducing the length of the second side, the area to be switched at a location recessed from the MFS is reduced as a current flowing from the main pole to the trailing shield or from the trailing shield to the main pole. With the reduced area of the magnetic layer, the overall switch time of the magnetic layer is decreased.
1. A magnetic recording head, comprising:
a trailing shield;
a main pole; and
a stack disposed between the trailing shield and the main pole at a media facing surface, wherein the stack comprises at least a layer having a surface facing the main pole, wherein the surface has a first side at the media facing surface and a second side opposite the first side, wherein the stack consists essentially of:
a seed layer contacting the main pole;
a magnetic layer contacting the seed layer; and
a spacer layer contacting the magnetic layer, wherein the spacer layer contacts a notch and wherein the notch comprises a magnetic material, wherein the main pole has:
a first track width at the media facing surface, the first track width being less than a length of the first side of the surface,
a second track width adjacent to the second side of the surface, the second track width being greater than the first track width, and
a third track width that is substantially equal to a length of the surface at a location disposed between the first and second sides of the surface.
2. The magnetic recording head of claim 1 , wherein the surface is substantially symmetric with respect to a central axis of the surface.
3. The magnetic recording head of claim 2 , wherein the surface further comprises the second side connecting the first side and a third side opposite the second side.
4. The magnetic recording head of claim 3 , wherein the second side forms a first angle with respect to the central axis, and the third side forms a second angle with respect to the central axis, wherein the first angle and the second angle each ranges from about five degrees to about 30 degrees.
5. The magnetic recording head of claim 1 , wherein the seed layer comprises Ta, Cr, Cu, NiAl, Ru, Rh, or combinations thereof.
6. The magnetic recording head of claim 1 , wherein the spacer layer is disposed between the at least a layer and the trailing shield.
7. The magnetic recording head of claim 1 , wherein the spacer layer comprises copper or silver tin alloy.
8. The magnetic recording head of claim 1 , wherein the trailing shield comprises the notch.
9. The magnetic recording head of claim 1 , wherein the at least a layer comprises a magnetic material.
10. The magnetic recording head of claim 9 , wherein the magnetic material comprises NiFe, CoMnGe, CoFe, or combinations thereof.
11. The magnetic recording head of claim 1 , wherein the at least a layer is a spin torque layer (STL).
12. The magnetic recording head of claim 1 , wherein the main pole comprises FeCo or FeCo(N).
13. The magnetic recording head of claim 1 , further comprising a leading shield.
14. The magnetic recording head of claim 13 , wherein the leading shield comprises FeCo or NiFe alloy.
15. A data storage device comprising the magnetic recording head of claim 1 .