Patent ID: 7309888

Claim:
A thin film spin-based device comprising: i) a first thin film ferromagnetic layer with a first changeable magnetization state responsive to a magnetic field coupled to the thin film spin-based device and characterized by a first coercivity; ii) a second thin film ferromagnetic layer with a second non-changeable magnetization state and characterized by a second coercivity which is substantially higher than said first coercivity; iii) a third thin film layer situated between said first thin film ferromagnetic layer and said second thin film ferromagnetic layer, said third thin film layer comprising a low transmission barrier material; wherein a spin polarized current flows in part in a path perpendicular to a magnetization plane of said first thin film ferromagnetic layer, to said third thin film layer, and to said second thin film ferromagnetic layer respectively; further wherein an impedance value of the device varies in accordance with a relationship between said first changeable magnetization state and said second non-changeable magnetization state.