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MA: Fachverband Magnetismus

MA 29: Magnetization Dynamics II

MA 29.11: Vortrag

Mittwoch, 2. April 2014, 17:45–18:00, HSZ 401

Energy dissipation of moved magnetic vortices — •Martin Magiera — Fakultät für Physik, Universität Duisburg-Essen

A two-dimensional easy-plane ferromagnetic substrate, interacting with a dipolar tip which is magnetized perpendicularly with respect to the easy plane is studied numerically by solving the Landau-Lifshitz Gilbert equation. The dipolar tip stabilizes a vortex structure which is dragged through the system and dissipates energy [EPL 100, 27004 (2012)]. Based on Thiele’s equation, an analytical expression for the energy dissipation for the limiting case of a vanishing scanning velocity as well as its validity are discussed [EPL 103, 57004 (2013)]. A magnetic friction number is defined which represents a general criterion for the validity of Thiele’s equation and quantifies the degree of nonlinearity in the response of a driven spin configuration.