Calculation of Damping Rates in Thin Inhomogeneous Ferromagnetic Films Due to Coupling to Lattice Vibrations

Authors

R. D. McMichael, National Institute of Standards & Technology
Andrew Kunz, Marquette UniversityFollow

Document Type

Article

Language

eng

Publication Date

5-2002

Publisher

American Institute of Physics

Source Publication

Journal of Applied Physics

Source ISSN

0021-8979

Abstract

This article describes calculations of ferromagnetic resonance damping rates due to coupling between the magnetization and lattice vibrations through inhomogeneities. The mechanisms we have explored include generation of shear phonons through inhomogeneous anisotropy and generation of both longitudinal and shear phonons through inhomogeneous magnetostriction. In both cases, inhomogeneities couple the uniform precession to finite wave vector phonons. For both coupling mechanisms, the predicted damping rate is on the order of 10⁶ s^-21 in transition metals. The damping rate by these mechanisms is inversely proportional to the fifth power of the shear phonon velocity, and may play a significant role in mechanically softer materials such as magnet/polymer nanocomposites.

Comments

Published version. Journal of Applied Physics, Vol. 91, No. 10 (May 2002). DOI. © 2002 American Institute of Physics. Used with permission.

Recommended Citation

McMichael, R. D. and Kunz, Andrew, "Calculation of Damping Rates in Thin Inhomogeneous Ferromagnetic Films Due to Coupling to Lattice Vibrations" (2002). Physics Faculty Research and Publications. 134.
https://epublications.marquette.edu/physics_fac/134