Spin orbital torque via spin hall effect based energy assisted magnetic recording
A magnetic recording head includes a trailing shield, a main pole, and a spin Hall layer. The spin Hall layer is disposed between the trailing shield and the main pole. A first spin torque layer is disposed between the spin Hall layer and the trailing shield. A second spin torque layer is disposed between the spin Hall layer and the main pole.
1. A magnetic recording head, comprising:
a trailing shield;
a main pole;
a spin Hall layer between the trailing shield and the main pole;
a first spin torque layer (STL) between the spin Hall layer and the trailing shield; and
a second spin torque layer (STL) between the spin Hall layer and the main pole.
2. The magnetic recording head of claim 1 , wherein the first STL and the second STL each comprises a negative magnetic anisotropy material.
3. The magnetic recording head of claim 1 , wherein the first STL and the second STL each have a thickness from about 3 nm to about 5 nm.
4. The magnetic recording head of claim 1 , wherein the spin Hall layer comprises a heavy metal selected from a group consisting of beta phase tungsten (β-W), beta phase tantalum (β-Ta), platinum (Pt), hafnium (Hf), an alloy of tungsten, an alloy of tellurium (Te), bismuth doped copper, antiferromagnetic materials, and multiple layers thereof.
5. The magnetic recording head of claim 1 , wherein the thickness of the spin Hall layer is from about 3 nm to about 8 nm.
6. The magnetic recording head of claim 1 , wherein the spin Hall layer, the first STL, and the second STL form a flat surface at a media facing surface of the magnetic recording head.
7. The magnetic recording head of claim 1 , wherein the spin Hall layer, the first STL, the second STL, the trailing shield, and the main pole form a flat surface at a media facing surface of the magnetic recording head.
8. The magnetic recording head of claim 1 , further comprising:
a first charge current blocking layer between the first STL and the spin Hall layer and the trailing shield; and
a second charge current blocking layer between the second STL and the spin Hall layer and the trailing shield.
9. A magnetic media drive, comprising:
a magnetic recording head, the magnetic recording head comprising:
a trailing shield;
a main pole;
a spin Hall layer between the trailing shield and the main pole;
a first spin torque layer (STL) between the spin Hall layer and the trailing shield; and
a second spin torque layer (STL) between the spin Hall layer and the main pole.
10. A magnetic recording head, comprising:
a trailing shield;
a main pole;
a coil around the main pole:
a spin Hall layer between the trailing shield and the main pole;
a trailing-shield-facing spin torque layer (STL) between the spin Hall layer and the trailing shield; and
a main-pole-facing spin torque layer (STL) between the spin Hall layer and the main pole,
wherein the spin Hall layer is adapted to transmit a charge current in a cross-track direction between the trailing shield and the main pole.
11. The magnetic recording head of claim 10 , wherein the coil is adapted to excite the main pole in a main pole magnetization direction and to excite the trailing shield in a trailing shield magnetization direction.
12. The magnetic recording head of claim 10 , wherein the spin Hall layer is adapted to transmit a spin orbital torque to switch a magnetization of the trailing-shield-facing STL in a direction similar to a trailing shield magnetization direction and to switch a magnetization of the main-pole-facing STL in a direction similar to a main pole magnetization direction.
13. The magnetic recording head of claim 10 , wherein the spin Hall layer is adapted to transmit a spin orbital torque to cause in-plane switching of a magnetization direction of the trailing-shield-facing STL and to cause in-plane switching of a magnetization direction of the main-pole-facing STL.
14. The magnetic recording head of claim 13 , wherein the in-plane switching of the magnetization direction of the trailing-shield-facing STL and the in-plane switching of the magnetization direction of the main-pole-facing STL generates a DC field in a same direction as a write field between the main pole and the trailing shield.
15. The magnetic recording head of claim 10 , wherein the spin Hall layer comprises beta phase tungsten (β-W), beta phase Tantalum (β-Ta), platinum (Pt), or combinations thereof.
16. The magnetic recording head of claim 10 , wherein the trailing-shield-facing STL and the main-pole-facing STL each comprises a negative magnetic anisotropy material.
17. A magnetic media drive, comprising:
a magnetic recording head, the magnetic recording head comprising:
a trailing shield;
a main pole;
a coil around the main pole:
a spin Hall layer between the trailing shield and the main pole;
a trailing-shield-facing spin torque layer (STL) between the spin Hall layer and the trailing shield; and
a main-pole-facing spin torque layer (STL) between the spin Hall layer and the main pole,
wherein the spin Hall layer is adapted to transmit a charge current in a cross-track direction between the trailing shield and the main pole.
18. A magnetic recording head, comprising:
a trailing shield;
a main pole;
a spin Hall layer between the trailing shield and the main pole;
a first spin torque layer (STL) between the spin Hall layer and the trailing shield;
a second spin torque layer (STL) between the spin Hall layer and the main pole; a first charge current blocking layer between the first STL and the spin Hall layer; and a second charge current blocking layer between the second STL and the spin Hall layer.
19. The magnetic recording head of claim 18 , wherein the first charge current blocking layer and the second charge current blocking layer each comprises a material that is a charge current insulator and a spin current conductor.
20. The magnetic recording head of claim 18 , wherein the first charge current blocking layer and the second charge current blocking layer each comprises a material selected from a group consisting of magnesium oxide and yttrium iron garnet.
21. The magnetic recording head of claim 18 , wherein the first charge current blocking layer and the second charge current blocking layer are each formed to a thickness from about 0.5 nm to about 1.5 nm.
22. The magnetic recording head of claim 18 , wherein the spin Hall layer comprises beta phase tungsten (β-W), beta phase Tantalum (β-Ta), platinum (Pt), or combinations thereof, and wherein the first STL and the second STL each comprises one or more layers of CoFe, CoIr, NiFe, CoFeX alloy wherein X is chosen from B, Ta, Re, Ir, or combinations thereof.
23. A magnetic media drive, comprising:
a magnetic recording head, the magnetic recording head comprising:
a trailing shield;
a main pole;
a spin Hall layer between the trailing shield and the main pole;
a first spin torque layer (STL) between the spin Hall layer and the trailing shield;
a second spin torque layer (STL) between the spin Hall layer and the main pole;
a first charge current blocking layer between the first STL and the spin Hall layer; and
a second charge current blocking layer between the second STL and the spin Hall layer.