Patent ID: 8824200

Claim:
A memory device comprising an array of cells, each cell comprising: a first ferromagnetic layer with a fixed magnetic polarity; a second ferromagnetic layer with a magnetic polarity modifiable by a spin torque transfer current; at least one conductor operatively connected to the first and second ferromagnetic layers; a barrier layer between the first and second ferromagnetic layers forming a magnetic tunnel junction; a third ferromagnetic layer magnetically coupled to the second magnetic layer; the third magnetic layer having tunable permittivity; a heater element operatively associated with the third magnetic layer which selectively provides heat to the third ferromagnetic layer; the third ferromagnetic layer having a first permeable amorphous state; the third ferromagnetic layer capable of being heated to a second state which is crystalline to thereby decrease the permittivity of the third magnetic layer; whereby changes in the permittivity of the third magnetic layer effect the response of the second ferromagnetic layer to a spin polarized current.