Magnetic Vorticity and Anti-vorticity in Ferromagnets

por Charles Campbell (School of Physics and Astronomy, Univ. of Minnesota)

jueves 26 abr. 2007 10:30 → 11:30 Europe/Madrid

Sala de Juntas del IFIC (Edf. Institutos de Investigación)

We describe the structure of a magnetic vortex, a magnetic anti-vortex, and assemblies of these topological objects, which are stable or metastable structures found in small ferromagnetic systems. These structures and the related dynamics are well-described by the Landau-Lifshitz-Gilbert equation, which is a local torque equation that includes dipolar and ferromagnetic interactions. Simulations and solutions of linearized versions of this equation are employed to study these structures and their spin waves and core dynamics. Direct comparisons are made with magnetic force microscopy and magneto-optical Kerr effect experiments on some of the same systems.