Magneto-acoustic oscillator

We demonstrate a hybrid oscillator system that combines the tunability of spin torque oscillators (STOs) with the exceptional quality factor (Q) of a high-overtone bulk acoustic resonator (HBAR) in a 2-chip system. The demonstrated magneto-acoustic oscillator (MAO) has a tuning range of 5% at 4 GHz with 175 kHz 3 dB linewidth. When compared to STOs we achieve a 200× reduction in linewidth, while retaining the original tuning range.