Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Magnetization Dynamics II of 3
MA 43.9: Vortrag
Donnerstag, 14. März 2013, 17:00–17:15, H22
Temperature Dependence of Nutation in Magnetic Nanostructures — •Danny Böttcher1,2 and Jürgen Henk2 — 1Max Planck Institute of Microstructure Physics, Halle, Germany — 2Martin Luther University Halle-Wittenberg, Halle, Germany
The dynamics of magnetic moments in nanostructures is closely linked to that of gyroscopes. The Landau-Lifshitz-Gilbert equation describes precession and relaxation but does not include nutation. Both precession and relaxation have been observed in experiments, in contrast to nutation. We have extended the atomistic Landau-Lifshitz-Gilbert equation as well as the Landau-Lifshitz-Miyazaki-Seki equation, that specifies the temperature in strong time correlated systems, by a nutation term. This allows us to study the significance of nutation in magnetization dynamics of nanostructures: for a single magnetic moment, a chain of Fe atoms, Co islands on Cu(111) as well as finite temperature. We find that nutation is significant at low-coordination sites and on the timescale of about 100 fs in systems with low time correlation at finite temperatures; its observation challenges todays experimental techniques.