Ultra-wide-band millimeter-wave generator using spin torque oscillator with strong interlayer exchange couplings.

ABSTRACT: Recent increased development interest in millimeter-wave oscillator devices has necessitated realization of small oscillators with high frequency, wide frequency tunability, and room-temperature operation. Spin-torque oscillators (STOs) are fascinating candidates for such applications because of their nanometer size and suitability for room-temperature operation. However, their oscillation frequency and tunable range are limited to the order of 100 MHz-10 GHz. Here, we propose use of bilinear (J₁) and biquadratic (J₂) interlayer exchange couplings between ferromagnets in STOs to overcome these problems. The bilinear coupling contributes to oscillation frequency enhancement, whereas the biquadratic coupling facilitates frequency tunability via a current. Using micromag

SUBMITTER: Kurokawa Y 

PROVIDER: S-EPMC9296563 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature