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Unidirectional Pumping of Phonons by Magnetization Dynamics

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arxiv 2003.02519 v2 pith:CXLWOM3Z submitted 2020-03-05 cond-mat.mes-hall

Unidirectional Pumping of Phonons by Magnetization Dynamics

classification cond-mat.mes-hall
keywords dynamicsmagneticmagnetizationoppositepumpingsawssurfaceunidirectional
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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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