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Journal Article

Unidirectional Pumping of Phonons by Magnetization Dynamics

MPS-Authors
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Yu,  T.
Kavli Institute of NanoScience, Delft University of Technology;
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

External Ressource
Fulltext (public)

PhysRevLett.125.077203.pdf
(Publisher version), 640KB

Supplementary Material (public)

Supplemental_Material.pdf
(Supplementary material), 2MB

Citation

Zhang, X., Bauer, G. E., & Yu, T. (2020). Unidirectional Pumping of Phonons by Magnetization Dynamics. Physical Review Letters, 125(7): 077203. doi:10.1103/PhysRevLett.125.077203.


Cite as: http://hdl.handle.net/21.11116/0000-0006-ED1A-3
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.