Resolving the controversy of a possible relationship between perpendicular magnetic anisotropy and the magnetic damping parameter

Published

August 13, 2014

Author(s)

Justin M. Shaw, Hans T. Nembach, Thomas J. Silva

Abstract

We use broadband ferromagnetic resonance spectroscopy to systematically measure the Landau- Lifshitz damping parameter, perpendicular anisotropy, and the orbital moment asymmetry in Co90Fe10/Ni multilayers. No relationship is found between perpendicular magnetic anisotropy and the damping parameter in this material. However, inadequate accounting for inhomogeneous linewidth broadening, spin-pumping, and two-magnon scattering could give rise to an apparent relationship between anisotropy and damping. In contrast, the orbital-moment asymmetry and the perpendicular anisotropy are linearly proportional to each other. These results demonstrate a fundamental mechanism by which perpendicular anisotropy can be varied independently of the damping parameter.

Citation

Applied Physics Letters

Volume

105

Issue

6

Pub Type

Journals

Download Paper

https://doi.org/10.1063/1.4892532

Keywords

FERROMAGNETIC-RESONANCE LINEWIDTH, MAGNETOCRYSTALLINE ANISOTROPY, MICROSCOPIC ORIGIN, THIN- FILMS, MULTILAYERS, RELAXATION, SCATTERING, CONSTANT, METALS

Citation

Shaw, J. , Nembach, H. and Silva, T. (2014), Resolving the controversy of a possible relationship between perpendicular magnetic anisotropy and the magnetic damping parameter, Applied Physics Letters, [online], https://doi.org/10.1063/1.4892532 (Accessed December 22, 2024)