Magnetic recording head with an SOT device coupled with side shield
The present disclosure generally relates to a magnetic recording head comprising a spintronic device. By electrically coupling the side shielding of the head (acting as current leads) to the spin Hall layer of the spintronic device, the current path length is optimally provided across the spin Hall layer as well as fitting within the space constraints of the overall head. In addition, by using an antiferromagnetic insulator as a spacer between the spin Hall layer and the magnetic spin torque layer of the spintronic device, electrically shunting into the magnetic spin torque layer is reduced, maximizing the spin torque and reducing loss of efficiency due to shunting. Thus, the magnetic recording head may utilize the energy assistance from the spintronic device without reducing the quality and reliability of the write head by running an undesirable current through critical components of the write head.
1. A magnetic recording head, comprising:
a main pole;
a trailing shield;
one or more side shields disposed adjacent to the main pole, at least one of the one or more side shields comprises a lead; and
a spintronic device disposed between the main pole and the trailing, the spintronic device comprising:
a spin Hall layer (SHL) is electrically coupled with the one or more side shields;
a spin torque layer (STL); and
a spacer layer disposed between the SHL and STL.
2. The magnetic recording head of claim 1 , further comprising an electrically insulating material disposed between the spintronic device and the main pole.
3. The magnetic recording head of claim 2 , wherein the SHL comprises platinum or beta-tungsten.
4. The magnetic recording head of claim 2 , wherein the spacer layer comprises antiferromagnetic material.
5. The magnetic recording head of claim 4 , wherein the antiferromagnetic material comprises nickel oxide.
6. The magnetic recording head of claim 2 , wherein the STL comprises NiFe, CoFe, CoFeNi, CoMnGe, NiCo, NiFeCu, CoFeMnGe, CoMnSi, CoFeSi, or Heusler alloys.
7. The magnetic recording head of claim 1 , further comprising an electrically insulating material disposed between the one or more side shields and the main pole.
8. The magnetic recording head of claim 1 , wherein the SHL is in contact with the trailing shield.
9. The magnetic recording head of claim 1 , wherein the STL is spaced from the main pole and the trailing shield by an insulating layer.
10. The magnetic recording head of claim 9 , wherein the spacer layer is spaced from the main pole and the trailing shield by the insulating layer.
11. A magnetic recording device comprising the magnetic recording head of claim 1 .
12. A magnetic recording head, comprising:
a main pole;
a trailing shield;
two or more side shields disposed adjacent to the main pole; and
a spintronic device disposed between the main pole and the trailing shield, wherein the two or more side shields and spintronic device are arranged to create a current path from one of the two or more side shields through the spintronic device to another of the two of more side shields.
13. The magnetic recording head of claim 12 , wherein the spintronic device comprises:
a spin torque layer (STL) having a first length in a down track direction and a first width in a cross track direction;
a spacer layer disposed on the STL and having a second length in the down track direction and a second width in the cross track direction; and
a spin Hall layer (SHL) disposed on the spacer layer and having a third length in the down track direction and a third width in the cross track direction, wherein the third length is greater than the first length and the second length.
14. The magnetic recording head of claim 13 , wherein the first width, the second width, and the third width are substantially equal.
15. The magnetic recording head of claim 13 , wherein the first length and the second length are substantially equal.
16. The magnetic recording head of claim 13 , wherein the STL is disposed at a media facing surface (MFS).
17. The magnetic recording head of claim 16 , wherein the SHL is recessed from the MFS.
18. A magnetic recording device comprising the magnetic recording head of claim 12 .