Patent ID: 7616412

Claim:
A magnetic oscillator comprising: a magnetic reference stack that comprises: a reference stack magnetic layer having a material-intrinsic non-in-plane magnetic anisotropy; and a reference stack spin torque enhancing layer exchange coupled to the reference stack magnetic layer; a magnetic oscillating stack that comprises; a spin torque driven layer; and an oscillating stack magnetic layer exchange coupled to the spin torque driven layer, wherein the oscillating stack magnetic layer has a strong material-intrinsic magnetic anisotropy with a perpendicular easy axis; and an interlayer between the reference stack and the oscillating stack such that the reference stack and oscillating stack are exchange coupled, and wherein the spin torque driven layer is between the interlayer and the oscillating stack magnetic layer, and wherein the reference stack spin torque enhancing layer is between the reference layer magnetic stack and the interlayer, wherein the reference stack has a sufficient perpendicular magnetic anisotropy such that the oscillating stack produces sustained gyromagnetic oscillation when the oscillating stack and the reference stack have opposite perpendicular magnetizations, and when there is a direct current flowing in the magnetic oscillator from the oscillating stack to the reference stack.