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DF: Fachverband Dielektrische Festkörper
DF 9: Poster I - Biomagnetism, FePt Nanoparticles, Magnetic Particles/Clusters, Magnetic Materials, Magnetic Semiconductors, Half-metals/Oxides, Multiferroics, Topological Insulators, Spin structures/Phase transitions, Electron theory/Computational micromagnetics, Magnetic coupling phenomena/Exchange bias, Spin-dependent transport, Spin injection/spin currents, Magnetization/Demagnetization dynamics, Magnetic measurement techniques
DF 9.50: Poster
Dienstag, 27. März 2012, 12:15–15:15, Poster A
Micromagnetic Simulations of Spin Dynamics in Magnetic Nanodots — •Robert Rückriem1, Philipp Krone1, Thomas Schrefl2, and Manfred Albrecht1 — 1Institute of Physics, Chemnitz University of Technology, Chemnitz, Germany — 2St. Pölten University of Applied Science, St. Pölten, Austria
Micromagnetic simulations were performed to investigate the spin dynamics in a single magnetic nanodot varying diameter (50−150 nm), thickness (5−20 nm), saturation magnetization (0.5−2.0 T) and uniaxial anisotropy (0−250 kJ/m3). Using a finite element based three step simulation technique, the spatial distribution of excited spin waves as well as their frequency spectra was obtained. The occurring spin wave modes were identified as edge modes which are strongly influenced by demagnetizing field effects [1] and center modes which oscillate in the whole nanodot. By changing the magnetic and geometric parameters of the nanostructure, the precession frequency can be tuned which is important for magnetic engineering for instance in the field of microwave assisted magnetic recording [2].
[1] J. Jorzick, S. O. Demokritov, B. Hillebrands, M. Bailleul, C. Fermon, K. Y. Guslienko, A. N. Slavin, D. V. Berkov and N. L. Gorn, Phys. Rev. Lett. 88, 047204 (2002)
[2] J.-G. Zhu, X. Zhu, Y. Tang, IEEE Trans. Magn. 44, 125 (2008)