Bridging magnonics and spin-orbitronics

TL;DR

This paper demonstrates an integrated nano-magnonic device that combines spin-orbit torque and nano-magnonics to generate and enhance spin wave propagation, enabling controllable non-reciprocal magnonic functionalities.

Contribution

It introduces a novel integrated device that leverages spin-orbit torque for both spin wave generation and long-range propagation enhancement.

Findings

Efficient generation of propagating spin waves using spin-orbit torque.

Long-range enhancement of spin wave propagation.

Controllable directional asymmetry in spin wave emission.

Abstract

The emerging field of nano-magnonics utilizes high-frequency waves of magnetization - the spin waves - for the transmission and processing of information on the nanoscale. The advent of spin-transfer torque has spurred significant advances in nano-magnonics, by enabling highly efficient local spin-wave generation in magnonic nanodevices. Furthermore, the recent emergence of spin-orbitronics, which utilizes spin-orbit interaction as the source of spin torque, has provided a unique ability to exert spin torque over spatially extended areas of magnonic structures, enabling enhanced spin-wave transmission. Here, we experimentally demonstrate that these advances can be efficiently combined. We utilize the same spin-orbit torque mechanism for the generation of propagating spin waves, and for the long-range enhancement of their propagation, in a single integrated nano-magnonic device. The demonstrated system exhibits a controllable directional asymmetry of spin wave emission, which is highly beneficial for applications in non-reciprocal magnonic logic and neuromorphic computing.