Antiferromagnetic stabilized storage layers in GMRAM storage devices
A giant magnetoresistive memory device includes a magnetic sense layer, a magnetic storage layer, a non-magnetic spacer layer between the magnetic sense layer and the magnetic storage layer, and an antiferromagnetic layer formed in proximity to the magnetic storage layer. The antiferromagnetic layer couples magnetically in a controlled manner to the magnetic storage layer such that the magnetic storage layer has uniform and/or directional magnetization. Additionally or alternatively, an antiferromagnetic layer may be formed in proximity to the magnetic sense layer. The antiferromagnetic layer in proximity to the magnetic sense layer couples magnetically in a controlled manner to the magnetic sense layer such that the magnetic sense layer has uniform and/or directional magnetization.
1. A method of fabricating a giant magnetoresistive memory device comprising:
forming a non-magnetic spacer layer between a magnetic sense layer and a magnetic storage layer;
forming a first antiferromagnetic layer between the magnetic storage layer and the non-magnetic spacer layer whereby the first antiferromagnetic layer couples magnetically in a controlled manner to the magnetic storage layer such that the magnetic storage layer has uniform and/or directional magnetization; and
forming a second antiferromagnetic layer between the magnetic sense layer and the non-magnetic spacer layer whereby the second antiferromagnetic layer couples magnetically in a controlled manner to the magnetic sense layer such that the magnetic sense layer has uniform and/or directional magnetization.
2. The method of claim 1 wherein the magnetic storage layer comprises a ferromagnetic alloy.
3. The method of claim 1 wherein the magnetic storage layer comprises ferromagnetic multilayers.
4. The method of claim 1 wherein the magnetic sense layer comprises a ferromagnetic alloy.
5. The method of claim 1 wherein the magnetic sense layer comprises ferromagnetic multilayers.
6. The method of claim 1 wherein the magnetic sense layer comprises a first ferromagnetic alloy, and wherein the magnetic storage layer comprises a second ferromagnetic alloy.
7. The method of claim 1 wherein the magnetic sense layer comprises first ferromagnetic multilayers, and wherein the magnetic storage layer comprises second ferromagnetic multilayers.
8. The method of claim 1 wherein the forming of a non-magnetic spacer layer between a magnetic sense layer and a magnetic storage layer comprises forming a non-magnetic spacer layer between a ferromagnetic storage layer and a ferromagnetic sense layer.
9. A method of fabricating a giant magnetoresistive memory device comprising:
forming a non-magnetic spacer layer between a magnetic sense layer and a magnetic storage layer;
forming first and second storage antiferromagnetic layers in proximity to the magnetic storage layer; and
forming first and second sense antiferromagnetic layers in proximity to the magnetic sense layer, wherein the storage layer is between the first and second storage antiferromagnetic layers, wherein the second storage antiferromagnetic layer is between the storage layer and the non-magnetic spacer layer, wherein the sense layer is between the first and second sense antiferromagnetic layers, and wherein the second sense antiferromagnetic layer is between the sense layer and the non-magnetic spacer layer.
10. The method of claim 9 wherein the second storage antiferromagnetic layer is thinner than the first storage antiferromagnetic layer.
11. The method of claim 9 wherein the second sense antiferromagnetic layer is thinner than the first sense antiferromagnetic layer.
12. The method of claim 11 wherein the second storage antiferromagnetic layer is thinner than the first storage antiferromagnetic layer.
13. The method of claim 9 wherein the magnetic storage layer comprises a ferromagnetic alloy.
14. The method of claim 9 wherein the magnetic storage layer comprises ferromagnetic multilayers.
15. The method of claim 9 wherein the magnetic sense layer comprises a ferromagnetic alloy.
16. The method of claim 9 wherein the magnetic sense layer comprises ferromagnetic multilayers.
17. The method of claim 9 wherein the magnetic sense layer comprises a first ferromagnetic alloy, and wherein the magnetic storage layer comprises a second ferromagnetic alloy.
18. The method of claim 9 wherein the magnetic sense layer comprises first ferromagnetic multilayers, and wherein the magnetic storage layer comprises second ferromagnetic multilayers.
19. The method of claim 9 wherein the forming of a non-magnetic spacer layer between a magnetic sense layer and a magnetic storage layer comprises forming a non-magnetic spacer layer between a ferromagnetic storage layer and a ferromagnetic sense layer.