Spin-orbit torque induced magnetization switching in a magnetic recording head
The present disclosure generally relates to magnetic media devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The recording head includes a main pole, a trailing shield hot seed layer, a spin Hall layer disposed between the main pole and the trailing shield hot seed layer, and a spin-torque layer disposed between the main pole and the trailing shield hot seed layer. Spin-orbit torque (SOT) is generated from the spin Hall layer. The spin-torque layer magnetization switching or precession is induced by the SOT. The SOT based head reduces the switching current and the V jump due to higher spin polarization ratio, which improves energy efficiency. In addition, the spin Hall layer and the spin-torque layer are easier to form compared to the conventional pseudo spin-valve structure.
1. A magnetic recording head, comprising:
a main pole;
a trailing shield;
a spin Hall means for generating a spin-orbital torque; and
a spin torque means for precessing from the spin-orbital torque, wherein the spin Hall means and the spin torque means are disposed between the main pole and the trailing shield.
2. The magnetic recording head of claim 1 , wherein the spin Hall means and the spin torque means wrapped around at least three sides of the main pole.
3. The magnetic recording head of claim 1 , wherein the trailing shield is a notchless trailing shield.
4. The magnetic recording head of claim 1 , wherein the spin Hall means is recessed from a media facing surface of the main pole.
5. The magnetic recording head of claim 1 , wherein the spin Hall means comprises beta phase tantalum, beta phase tungsten, platinum, hafnium, an alloy of tungsten with hafnium, iridium, or bismuth doped copper, (Bi,Sb)Te, MnIr, XMn (X=Fe, Pd, Ir, and Pt), or antiferromagnets.
6. The magnetic recording head of claim 1 , wherein the spin torque means is disposed on the spin Hall means.
7. The magnetic recording head of claim 1 , wherein the spin Hall means is configured to injected electrical current to a spin current at a spin injection efficiency (β) of 0.3 to 1.75.
8. The magnetic recording head of claim 1 , further comprising a dielectric material between the spin torque means and the main pole.
9. A method of writing data to a magnetic medium, comprising:
providing a spin torque structure proximate a main pole and a trailing shield, the spin torque structure disposed over a spin Hall structure;
injecting an electrical current to the spin Hall structure;
generating a spin-orbit torque from the spin Hall structure; and
inducing precession of the spin torque structure from the spin-orbital torque.
10. The method of claim 9 , wherein the spin Hall structure is recessed from a media facing surface of the main pole.
11. The method of claim 9 , wherein the spin Hall structure comprises beta phase tantalum, beta phase tungsten, platinum, hafnium, an alloy of tungsten with hafnium, iridium, or bismuth doped copper, (Bi,Sb)Te, MnIr, XMn (X=Fe, Pd, Ir, and Pt), or antiferromagnets.
12. The method of claim 9 , wherein the spin torque structure is disposed on the spin Hall structure.
13. The method of claim 9 , wherein the electrical current injected to the spin Hall structure is converted to a spin current at a spin injection efficiency (β) of 0.3 to 1.75.
14. The method of claim 9 , further comprising providing a dielectric material between the spin torque structure and the main pole.
15. The method of claim 9 , wherein the spin Hall structure and the spin torque structure are wrapped around at least three sides of the main pole.
16. A method of writing data to a magnetic medium, comprising:
providing a spin torque structure between a main pole and a notchless trailing shield, the spin torque structure disposed over a spin Hall structure;
injecting an electrical current to the spin Hall structure;
generating spin-orbit torque from the spin Hall structure; and
inducing precession of the spin torque structure from the spin-orbital torque.
17. The method of claim 16 , wherein the spin Hall structure is recessed from a media facing surface of the main pole.
18. The method of claim 16 , wherein the spin Hall structure comprises beta phase Tantalum, beta phase tungsten, platinum, hafnium, an alloy of tungsten with hafnium, iridium, or bismuth doped copper, (Bi,Sb)Te, MnIr, XMn (X=Fe, Pd, Ir, and Pt), or antiferromagnets.
19. The method of claim 16 , wherein the spin torque structure is disposed to the spin Hall structure.
20. The method of claim 16 , wherein the electrical current injected to the spin Hall structure is converted to a spin current at a spin injection efficiency (β) of 0.3 to 1.75.