Techniques for reducing Neel coupling in toggle switching semiconductor devices
View Patent ↗The present invention provides techniques for data storage. In one aspect of the invention, a semiconductor device is provided. The semiconductor device comprises at least one free layer and at least one fixed layer, with at least one barrier layer therebetween. At least one pinned magnetic layer is separated from the at least one free layer by at least one non-magnetic layer, the at least one pinned magnetic layer and non-magnetic layer being configured to cancel out at least a portion of a Neel coupling between the at least one free layer and the at least one fixed layer.
1. A semiconductor device, comprising:
at least one free layer;
at least one fixed layer comprising at least one magnetic layer pinned to at least one anti-ferromagnetic layer;
at least one barrier layer between the at least one free layer and the at least one fixed layer; and
at least one pinned magnetic layer separated from the at least one free layer by at least one non-magnetic layer, the at least one pinned magnetic layer and non-magnetic layer being configured to cancel out at least a portion of a Neel coupling between the at least one free layer and the at least one fixed layer.
2. The device of claim 1 , wherein the at least one free layer comprises an alloy selected from the group consisting of NiFe alloys, CoFeB alloys and combinations comprising at least one of the foregoing alloys.
3. The device of claim 1 , wherein the at least one pinned magnetic layer comprises at least one magnetic layer pinned to at least one anti-ferromagnetic layer.
4. The device of claim 3 , wherein the at least one magnetic layer comprises two or more magnetic layers anti-parallel coupled to each other by at least one spacer layer.
5. The device of claim 3 , wherein the at least one anti-ferromagnetic layer comprises a metal alloy selected from the group consisting of PtMn, IrMn and combinations comprising at least one of the foregoing alloys.
6. The device of claim 3 , wherein the at least one magnetic layer comprises two or more magnetic layers anti-parallel coupled to each other by at least one non-magnetic spacer layer.
7. The device of claim 3 , wherein the at least one magnetic layer comprises two or more magnetic layers anti-parallel coupled to each other by at least one spacer layer, the at least one spacer layer comprising Ru.
8. The device of claim 1 , wherein the at least one pinned magnetic layer comprises at least one ferromagnetic layer pinned to at least one anti-ferromagnetic layer.
9. The device of claim 3 , wherein the at least one magnetic layer comprises CoFe.
10. The device of claim 1 , wherein the at least one non-magnetic layer comprises a material selected from the group consisting of Ta, TaN and combinations comprising at least one of the foregoing materials.
11. The device of claim 1 , wherein the at least one barrier layer comprises a material selected from the group consisting of aluminum oxides, tantalum oxides, magnesium oxides and combinations comprising at least one of the foregoing materials.
12. The device of claim 1 , wherein the at least one free layer comprises two or more magnetic layers anti-parallel coupled to each other by at least one spacer layer.
13. The device of claim 1 , wherein the at least one fixed layer comprises two or more magnetic layers anti-parallel coupled to each other by at least one spacer layer.
14. The device of claim 1 , wherein a thickness of the at least one non-magnetic layer is configured to cancel out at least a portion of the Neel coupling between the at least one free layer and the at least one fixed layer.
15. The device of claim 1 , wherein the at least one non-magnetic layer is configured to have a thickness relative to a thickness of the at least one barrier layer such that at least a portion of the Neel coupling between the at least one free layer and the at least one fixed layer is canceled out.
16. The device of claim 1 , wherein the at least one non-magnetic layer is configured to have a thickness that is substantially similar to a thickness of the at least one barrier layer such that at least a portion of the Neel coupling between the at least one free layer and the at least one fixed layer is canceled out.
17. An integrated circuit including at least one magnetic memory cell, the at least one magnetic memory cell comprising:
at least one free layer;
at least one fixed layer comprising at least one magnetic layer pinned to at least one anti-ferromagnetic layer;
at least one barrier layer between the at least one free layer and the at least one fixed layer; and
at least one pinned magnetic layer separated from the at least one free layer by at least one non-magnetic layer, the at least one pinned magnetic layer and non-magnetic layer being configured to cancel out at least a portion of a Neel coupling between the at least one free layer and the at least one fixed layer.
18. A magnetic random access memory device, comprising:
a plurality of magnetic memory cells configured in an array, at least one of the plurality of magnetic memory cells comprising:
at least one free layer;
at least one fixed layer comprising at least one magnetic layer pinned to at least one anti-ferromagnetic layer;
at least one barrier layer between the at least one free layer and the at least one fixed layer; and
at least one pinned magnetic layer separated from the at least one free layer by at least one non-magnetic layer, the at least one pinned magnetic layer and non-magnetic layer being configured to cancel out at least a portion of a Neel coupling between the at least one free layer and the at least one fixed layer.
19. A semiconductor device, comprising:
at least one free layer comprising two or more magnetic layers anti-parallel coupled to each other by at least one spacer layer;
at least one fixed layer comprising at least one magnetic layer pinned to at least one anti-ferromagnetic layer;
at least one barrier layer between the at least one free layer and the at least one fixed layer; and
at least one pinned magnetic layer separated from the at least one free layer by at least one non-magnetic layer, the at least one pinned magnetic layer comprising at least one magnetic layer pinned to at least one anti-ferromagnetic layer, the at least one pinned magnetic layer and non-magnetic layer being configured to cancel out at least a portion of a Neel coupling between the at least one free layer and the at least one fixed layer.
20. The device of claim 19 , wherein the at least one fixed layer comprises two or more magnetic layers anti-parallel coupled to each other by at least one spacer layer.
21. The device of claim 19 , wherein the at least one pinned magnetic layer comprises two or more magnetic layers anti-parallel coupled to each other by at least one spacer layer.