Antiferromagnetically stabilized pseudo spin valve for memory applications
View Patent ↗The invention relates to improving the switching reliability of a magnetic memory cell in a magnetic random access memory (MRAM). Embodiments of the invention add an antiferromagnet to a magnetic memory cell. An antiferromagnetic layer can be formed adjacent to a soft layer in the MRAM on a side of the soft layer that is opposite to a hard layer of the MRAM. One embodiment further includes an additional interlayer of non-antiferromagnetic material between the antiferromagnetic layer and the soft layer.
1. A memory device comprising:
a plurality of cells arranged into an array, where the array includes a plurality of word lines and a plurality of bit lines, where a cell in the plurality of cells further comprises:
an antiferromagnetic layer disposed adjacent to a soft layer of ferromagnetic material, where the antiferromagnetic layer is also disposed on a side of the soft layer that is opposite to a hard layer of ferromagnetic material; and
a spacer layer of non-ferromagnetic material disposed between the hard layer and the soft layer.
2. The memory device as defined in claim 1 , wherein the antiferromagnetic layer comprises at least one alloy of manganese.
3. The memory device as defined in claim 1 , wherein the antiferromagnetic layer comprises ferro manganese (FeMn).
4. The memory device as defined in claim 1 , wherein a thickness of the antiferromagnetic layer is within a range of about 10 Angstroms (Å) to about 70 Å.
5. The memory device as defined in claim 1 , wherein the soft layer is in direct contact with the antiferromagnetic layer, where the spacer layer is in direct contact with the soft layer, and where the hard layer is in direct contact with the spacer layer.