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arXiv · 2003.02519

Unidirectional Pumping of Phonons by Magnetization Dynamics

Xiang Zhang·Gerrit E. W. Bauer·Tao Yu
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Abstract

We propose a method to control surface phonon transport by weak magnetic fields based on the pumping of surface acoustic waves (SAWs) by magnetostriction. We predict that the magnetization dynamics of a nanowire on top of a dielectric films injects SAWs with opposite angular momenta into opposite directions. Two parallel nanowires form a phononic cavity that at magnetic resonances pump a unidirectional SAW current into half of the substrate.

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Xiang Zhang, Gerrit E. W. Bauer, Tao Yu. 2020-03-05. Unidirectional Pumping of Phonons by Magnetization Dynamics. https://doi.org/10.1103/physrevlett.125.077203

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