Regensburg 2007 – scientific programme
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MA: Fachverband Magnetismus
MA 7: Micromagnetism/Computational Magnetics
MA 7.3: Talk
Monday, March 26, 2007, 17:30–17:45, H10
Influence of spin waves on the dynamics of magnetization processes — •Sebastian Macke, Dagmar Goll, and Gisela Schütz — Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart, Germany
Spin wave influenced switching of the magnetization of thin Co and permalloy films is studied by micromagnetic simulations. Therefore standing spin waves are superimposed on the magnetization configuration in the ground state. The dependence of magnetization reversal is analyzed for variable frequencies and phases with amplitudes up to 30∘. Most spin waves cause an increase of the switching time but not all of them. The variation of switching times depends strongly on the external field. In the field range in which the switching time increases a significant dependence on the spin wave phase is oberserved. Thermally excited spin waves with Bose-Einstein distribution reduce the saturation magnetization by the well-known Bloch T3/2 -law. In order to take care of the role of the spectrum of spin waves the effect of a discrete number of spin waves with different frequencies is determined quantitatively.