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MA: Fachverband Magnetismus

MA 43: Magnetization / Demagnetization Dynamics III

MA 43.9: Vortrag

Donnerstag, 19. März 2015, 11:45–12:00, EB 301

Microscopic theory of Gilbert damping in metallic ferromagnets — •Antonio Costa and Roberto Muniz — Universidade Federal Fluminense, Niteroi, RJ, Brazil

We present a microscopic theory for magnetization relaxation in metallic ferromagnets of nanoscopic dimensions that is based on the dynamic response function in the presence of spin-orbit coupling. Our approach allows the calculation of the Gilbert damping parameter even in perfectly crystalline systems, where other approaches fail. We demonstrate that the relaxation properties are not completely determined by the transverse susceptibility alone, and that the damping rate has a non-negligible frequency dependency in experimentally relevant situations.