Modulation of single and double spin torque oscillators

Abstract

We discuss modulation of metallic spin torque oscillators (STOs) based on single and double nano‐contacts. The modulation behavior of both types of devices is characterized by equally spaced multiple sidebands, which can be ascribed mostly to a frequency modulation phenomenon. However, quantitative examination reveals that amplitude modulation is also present in both types of devices. We also show the feasibility of modulating the synchronized state of a double nano‐contact STO. The synchronized state can be treated as a single oscillator, which is a very promising feature for future applications of STO arrays.z