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; and
a spin torque layer (STL) between the spin Hall layer and the trailing shield, the STL comprising a negative magnetic anisotropy material.
2. The magnetic recording head of claim 1 , wherein the STL has a thickness from about 3 nm to about 5 nm.
3. 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.
4. The magnetic recording head of claim 1 , wherein a thickness of the spin Hall layer is from about 3 nm to about 8 nm.
5. The magnetic recording head of claim 1 , wherein the spin Hall layer and the STL form a flat surface at a media facing surface of the magnetic recording head.
6. The magnetic recording head of claim 1 , wherein the spin Hall layer, the STL, the trailing shield, and the main pole form a flat surface at a media facing surface of the magnetic recording head.
7. The magnetic recording head of claim 1 , further comprising:
a first charge current blocking layer between the STL and the spin Hall layer and the trailing shield; and
a second charge current blocking layer between the spin Hall layer and the trailing shield.
8. The magnetic recording head of claim 1 , further comprising a charge current blocking layer between the STL and the spin Hall layer, the charge current blocking layer comprising a material that is a charge current insulator and a spin current conductor, wherein the charge current blocking layer has a thickness from about 0.5 nm to about 1.5 nm.
9. A magnetic media drive, comprising:
a magnetic recording head, comprising:
a trailing shield;
a main pole;
a spin Hall layer between the trailing shield and the main pole; and
a spin torque layer (STL) between the spin Hall layer and the trailing shield, the STL comprising a negative magnetic anisotropy material.
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; and
a trailing-shield-facing spin torque layer (STL) between the spin Hall layer and the trailing shield, 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.
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.
14. The magnetic recording head of claim 13 , wherein the in-plane switching of the magnetization direction of the trailing-shield-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 comprises a negative magnetic anisotropy material.
17. A magnetic media drive, comprising:
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; and
a trailing-shield-facing spin torque layer (STL) between the spin Hall layer and the trailing shield, 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 spin torque layer (STL) between the spin Hall layer and the trailing shield; and
a charge current blocking layer between the STL and the spin Hall layer.
19. The magnetic recording head of claim 18 , wherein the charge current blocking layer comprises a material that is a charge current insulator and a spin current conductor.
20. The magnetic recording head of claim 18 , wherein the charge current blocking layer 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 charge current blocking layer has 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 STL 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, comprising:
a trailing shield;
a main pole;
a spin Hall layer between the trailing shield and the main pole;
a spin torque layer (STL) between the spin Hall layer and the trailing shield; and
a charge current blocking layer between the STL and the spin Hall layer.