Veranstaltungsdetails

24.1.2012, 17:00
Jungiusstr. 11, Hörsaal AP

SFB 668 - Kolloquium

Prof. Dr. J.-C. Levy (University Paris-7):

Magnetic vortices in dots: stability and dynamics

Analytical considerations on magnetic vortices in 2D dots as well as numerical computations from Langevin spin dynamics and from the dynamical matrix diagonalization enable us to derive the phase diagram of 2D dots, including the occurrence of out-of-plane and in-plane vortices. Analytical considerations also show that non linear effects are strictly localized at domain walls and vortices, and that such systems with dipolar interactions enjoy wave packet magnons with special localization properties as confirmed when solving the dynamical matrix. This last point has consequences on Brillouin linewidth spectrum. Langevin spin dynamics show the evolution of an out-of-equilibrium condition and thus the vortex gyrotropic motion as well as the full magnon spectrum.