Unidirectional Pumping of Phonons by Magnetization Dynamics
Xiang Zhang (Kavli institute of nanoscience Delft, TU Delft - QN/Blaauboer Group)
Gerrit Bauer (Tohoku University, TU Delft - QN/Bauer Group, Kavli institute of nanoscience Delft)
Tao Yu (Kavli institute of nanoscience Delft, TU Delft - QN/Bauer Group, Max Planck Institute for the Structure and Dynamics of Matter, Hamburg)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
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.