Spin orbital torque based microwave assisted magnetic recording with dual spin hall layers or wrap around spin hall layer
A magnetic recording head includes a trailing shield and a main pole. A trailing shield gap is between the trailing shield and the main pole. A spin orbital torque structure is within the trailing shield gap. The spin orbital torque structure includes a spin torque layer having a first side and a second side at a media facing surface. A first spin Hall layer is along the first side of the spin torque layer. A second spin Hall layer is along the second side of the spin torque layer. The first spin Hall layer comprises a heavy metal material having a positive spin Hall angle. The second spin Hall layer comprises a heavy metal material having a negative spin Hall angle.
1. A magnetic recording head, comprising:
a trailing shield;
a main pole;
a trailing shield gap between the trailing shield and the main pole; and
a spin orbital torque structure within the trailing shield gap, the spin orbital torque structure comprising:
a spin torque layer having a first side and a second side at a media facing surface,
a first spin Hall layer along the first side of the spin torque layer,
a second spin Hall layer along the second side of the spin torque layer,
a first charge current blocking layer separating the first spin Hall layer and the spin torque layer, and
a second charge current blocking layer separating the second spin Hall layer and the spin torque layer,
wherein the first spin Hall layer comprises a heavy metal material having a positive spin Hall angle and wherein the second spin Hall layer comprises a heavy metal material having a negative spin Hall angle.
2. The magnetic recording head of claim 1 , further comprising a first electrical lead coupled to the first spin Hall layer and the second spin Hall layer, and a second electrical lead coupled to the first spin Hall layer and the second spin Hall layer.
3. The magnetic recording head of claim 2 , wherein the first electrical lead and the second electrical lead are configured to direct charge current in a cross-track direction across the trailing shield gap.
4. The magnetic recording head of claim 1 , wherein the first spin Hall layer comprises platinum.
5. The magnetic recording head of claim 1 , wherein the second spin Hall layer comprises beta phase tungsten or beta phase tantalum.
6. The magnetic recording head of claim 1 , wherein a magnetization direction of a spin current of the first spin Hall layer adjacent the first side of the spin torque layer is in a same direction as a magnetization direction of a spin current of the second spin Hall layer adjacent the second side of the spin torque layer.
7. A data storage device, comprising the magnetic recording head of claim 1 .
8. A magnetic recording head, comprising:
a trailing shield;
a main pole;
a trailing shield gap between the trailing shield and the main pole; and
a spin orbital torque structure within the trailing shield gap, the spin orbital torque structure comprising:
a spin torque layer having a first side and a second side at a media facing surface,
a first spin Hall layer along the first side of the spin torque layer, and
a second spin Hall layer along the second side of the spin torque layer,
wherein the first spin Hall layer comprises a heavy metal material having a positive spin Hall angle and wherein the second spin Hall layer comprises a heavy metal material having a negative spin Hall angle,
wherein the main pole and trailing shield are configured to act as electrical leads for flowing charge current across the first spin Hall layer and across the second spin Hall layer.
9. The magnetic recording head of claim 8 , wherein the main pole and trailing shield are configured to act as electrical leads for flowing charge current across the first spin Hall layer and across the second spin Hall layer in a track direction.
10. The magnetic recording head of claim 8 , wherein the first spin Hall layer comprises platinum.
11. The magnetic recording head of claim 8 , wherein the second spin Hall layer comprises beta phase tungsten or beta phase tantalum.
12. The magnetic recording head of claim 8 , wherein a magnetization direction of a spin current of the first spin Hall layer adjacent the first side of the spin torque layer is in a same direction as a magnetization direction of a spin current of the second spin Hall layer adjacent the second side of the spin torque layer.
13. A data storage device, comprising the magnetic recording head of claim 8 .
14. A magnetic recording head, comprising:
a trailing shield;
a main pole;
a trailing shield gap between the trailing shield and the main pole;
a spin torque layer within the trailing shield gap, the spin torque layer having a media facing surface;
a spin Hall means for producing two or more ampere magnetic fields and spin current in the same direction along at least two sides of the spin torque layer at the media facing surface, the spin Hall means disposed within the trailing shield gap; and
a charge current blocking means for reducing a charge current through the spin Hall means layers from electrically shunting through the spin torque layer, the charge current blocking means separating the spin torque layer and the spin Hall means.
15. The magnetic recording head of claim 14 , further comprising a first electrical lead and a second electrical lead configured to direct a charge current flow in a cross-track direction through the spin Hall means.
16. The magnetic recording head of claim 14 , wherein the spin Hall means and the spin torque layer form a flat surface at the media facing surface.
17. A data storage device, comprising the magnetic recording head of claim 14 .
18. A magnetic recording head, comprising:
a trailing shield;
a main pole;
a trailing shield gap between the trailing shield and the main pole;
a spin torque layer within the trailing shield gap, the spin torque layer having a media facing surface; and
a spin Hall means for producing two or more ampere magnetic fields and spin current in the same direction along at least two sides of the spin torque layer at the media facing surface, the spin Hall means disposed within the trailing shield gap,
wherein the main pole and the trailing shield are configured as electrical leads for directing one or more charge current flows through the spin Hall means.
19. The magnetic recording head of claim 18 , further comprising a first electrical lead and a second electrical lead configured to direct a charge current flow in a track direction through the spin Hall means.
20. The magnetic recording head of claim 18 , wherein the spin Hall means and the spin torque layer form a flat surface at the media facing surface.
21. A data storage device, comprising the magnetic recording head of claim 18 .