Array of Synchronized Nano-Oscillators Based on Repulsion between Domain Wall and Skyrmion

Abstract

Spin-transfer nano-oscillators (STNOs) have a lot of potential as memory devices or microwave sources, but low output power limits their application. Reliable synchronization of a collection of many STNOs would improve a device's power. The authors propose a dumbbell-shaped STNO in which the repulsive force between a magnetic domain wall and a skyrmion provides mechanical synchronization, rather than the traditional phase-locking approach. In principle, there is no limit to the number of STNOs that can be synchronized via this mechanism.