[Back]

G. Hrkac, M. Kirschner, F. Dorfbauer, D. Süss, O. Ertl, J. Fidler, T. Schrefl:
"Influence of eddy currents on the effective damping parameter";
Journal of Applied Physics, 99 (2006), 08B902-1 - 08B902-3.

nfluence of eddy currents on the effective damping parameter

G. Hrkac, M. Kirschner, F. Dorfbauer, D. Suess, O. Ertl, and J. Fidler
Solid State Physics, Vienna University of Technology, Vienna 1040, Austria

T. Schrefl
Department of Engineering Materials, University of Sheffield, Sheffield, United Kingdom

A method for the calculation of the effective damping parameter as a function of particle size and electric conductivity is presented. An extended three-dimensional finite element/boundary element micromagnetic model is used to solve the Landau-Lifshitz-Gilbert equation together with the eddy current diffusion equation. From the change of energy with time an effective damping parameter is derived from which the net eddy current contribution is calculated. It is shown that the eddy current effects are reduced with an increasing applied field and are increased for materials with a low resistivity. Furthermore it is shown that the size of the particles, which designates the coherence of the spin structure, is essential for the eddy current net contribution.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588229

http://dx.doi.org/10.1063/1.2168436