Patent ID: 8203389

Claim:
An RF signal generation device, comprising: (a) a spin torque oscillator (STO) with a top surface and having at least one magnetic reference layer (MRL), a magnetic oscillation layer (MOL), and a first junction layer formed between the MRL and MOL; (b) a magnetoresistive (MR) sensor having at least one magnetic sensing layer that is magnetostatically coupled with said MOL, a second magnetic reference layer with an in-plane pinned magnetization, and a second junction layer formed between the magnetic sensing layer and the second magnetic reference layer; and (c) a non-magnetic conductive spacer layer that is sandwiched between said MOL layer and said magnetic sensing layer wherein an oscillation state having an oscillation frequency is induced in said MOL when a magnetic field is applied to said STO and MR sensor in a direction perpendicular to the STO top surface concurrently with a first electric current flowing from said conductive spacer layer through the MOL to the MRL, and said magnetostatic coupling generates magnetic oscillation with an RF frequency in said magnetic sensing layer that produces a varying voltage across the MR sensor when a second electric current flows through the MR sensor layers.