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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.70: Poster

Friday, March 27, 2009, 11:00–14:00, P1A

Magnetization dynamics of nanoparticles subject to continuous magnetic fields or ultra short magnetic pulses — •Alexander Sukhov^1,2 and Jamal Berakdar² — ¹Max-Planck-Institut für Mikrostrukturphysik, Halle/Saale — ²Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Halle/Saale

We study the magnetization dynamics of a Stoner nanoparticle using the Landau-Lifshitz-Gilbert equation of motion extended for finite temperatures. In case of continuous static or time-dependent magnetic fields we are interested in switching properties of the nanoparticles: Critical fields and the corresponding reversal times as a function of damping and temperature for various anisotropy types [1]. In the scheme proposed for ultra short magnetic pulses we show both analytically and numerically that not only switching but also a certain stabilization of the magnetization ("freezing") can be achieved regardless the anisotropy type and temperature. In contrast to the continuous fields additional parameters arise: Dynamics and control strongly depend upon an angle shift between the magnetization and the pulse, the duration and the form of pulses.
A. Sukhov and J. Berakdar, J. Phys.: Condens. Matter 20, 125226 (2008).