Damping of magnetization dynamics by phonon pumping

Simon Streib, Hedyeh Keshtgar, Gerrit E. W. Bauer

Published 2018-04-19Version 1

We theoretically investigate pumping of phonons by the dynamics of a magnetic film into a non-magnetic contact. The enhanced damping due to the loss of energy and angular momentum does not obey the Gilbert orthodoxy. The phonon pumping depends on magnetization direction as well as geometrical and material parameters and could be observable, e.g., in thin films of yttrium iron garnet on a thick dielectric substrate.