[SEMINARI] SEMINAR: Charles Campbell, Magnetic Vorticity and Anti-vorticity in Ferromagnets

[German Rodrigo Garcia]

Magnetic Vorticity and Anti-vorticity in Ferromagnets

Charles Campbell
School of Physics and Astronomy, Univ. of Minnesota
Thursday, 26 of April of 2007     10:30 AM
Committe hall of IFIC

Abstract

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.