Patent ID: 11917926
Assignee: INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY
Field: Computer technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 6:
7. A multibit memory comprising:
a first synthetic antiferromagnetic material;
a first tunnel barrier layer formed on the first synthetic antiferromagnetic material;
a second synthetic antiferromagnetic material formed on the first tunnel barrier layer;
a second tunnel barrier layer formed on the second synthetic antiferromagnetic material; and
a third synthetic antiferromagnetic material formed on the second tunnel barrier layer,
wherein each of the synthetic antiferromagnetic materials comprises:
a lower ferromagnetic layer;
a Ruderman-Kittel-Kasuya-Yosida (RKKY) inducing layer formed on the lower ferromagnetic layer; and
an upper ferromagnetic layer formed on the RKKY inducing layer,
wherein due to a program current applied in parallel to a surface of the RKKY inducing layer, the lower ferromagnetic layer and the upper ferromagnetic layer have perpendicular magnetic anisotropy and have magnetic moments in opposite directions,
wherein the upper ferromagnetic layer of the first synthetic antiferromagnetic material, the first tunnel barrier layer formed on the upper ferromagnetic layer of the first synthetic antiferromagnetic material, and a lower ferromagnetic layer of the second synthetic antiferromagnetic material in contact with the first tunnel barrier layer form a first resistance unit, and
the upper ferromagnetic layer of the second synthetic antiferromagnetic material, the second tunnel barrier layer formed on the upper ferromagnetic layer of the second synthetic antiferromagnetic material, and a lower ferromagnetic layer of the third synthetic antiferromagnetic material in contact with the second tunnel barrier layer form a second resistance unit.