Patent ID: 7973349
Filing Date: 2011-07-05
Classification: B82Y,G11B,G11C,H01F,H01L

Abstract:
1. A magnetic memory device, comprising: a substrate; a magnetic cell configured to have a memory bit with two states, the magnetic cell formed on the substrate and comprising: a circuit coupled to the magnetic cell, the circuit configured to perform a read operation and a write operation, wherein the circuit is configured such that in the read operation the circuit applies a read electric current passing perpendicularly through the magnetic cell that is insufficient to switch the magnetization direction of the multilayered free ferromagnetic stack, and wherein the circuit is configured such that in the write operation the circuit applies the write electric current greater than the read electric current to the magnetic cell sufficient to switch the magnetization direction of the multilayered free ferromagnetic stack based on spin transfer effect caused by the write electric current passing perpendicularly through the magnetic cell, and wherein the magnetic biasing layer is configured such that a switched magnetization direction of the multilayered free ferromagnetic stack is maintained after removal of the write electric current.