Unidirectional Pumping of Phonons by Magnetization Dynamics

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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.

Original languageEnglish
Article number077203
Number of pages6
JournalPhysical Review Letters
Volume125
Issue number7
DOIs
Publication statusPublished - 2020

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