Patent ID: 7215570

Claim:
A spin-based device including a thin film stack comprising: i) a first ferromagnetic layer characterized by a first coercivity and a first magnetization that is responsive to a switching magnetic field imposed on the spin-based device; ii) a second ferromagnetic layer characterized by a second magnetization and a second coercivity which is substantially greater than said first coercivity, such that said second magnetization does not change in response to said switching magnetic field; wherein an impedance of the spin-based device to a spin based current varies in accordance with a magnetization orientation relationship between said first ferromagnetic layer and said second ferromagnetic layer; iii) a third layer including at least one of gold, silver, aluminum and/or copper situated between said first ferromagnetic layer and said second ferromagnetic layer; iv) a fourth layer located in said thin film stack which is adapted to promote isotropic flow for said spin based current.