Patent ID: 9577653
Date: 2017-02-21
CPC Classifications: H03B,H03L

Claim:
1. A spin-torque oscillator device for generating an RF or microwave oscillation signal, comprising: a substrate; a magnetic spin-torque structure formed on the substrate and structured to include a multi-layer stack of layers on the substrate to exhibit a spin-torque effect, wherein the multi-layer stack is shaped to have a shape anisotropy in each layer and includes a thin magnetic free layer and a thick magnetic reference layer; a circuit coupled to the magnetic spin-torque structure to apply a DC bias current to flow through the magnetic spin-torque structure; and a magnetic field module configured to apply a bias magnetic field to the magnetic spin-torque structure, wherein the magnetic spin-torque structure, the DC bias current and the bias magnetic field are configured to control a magnetic precession in the magnetic spin-torque structure to convert the DC bias current into an RF or microwave oscillation signal and effectuate a negative spin torque feedback to reduce a coupling between an amplitude and an oscillation frequency of the RF or microwave signal, and wherein the magnetic field module is structured to apply the bias magnetic field to the magnetic spin-torque structure below a magnetic field threshold value that produces a relatively uniform internal field distribution, thus causing the RF or microwave oscillation signal to be in a single mode.