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K: Fachverband Kurzzeitphysik
K 1: Optische Methoden und Verfahren
K 1.4: Talk
Monday, February 25, 2013, 15:00–15:15, HS 4
Magnetization oscillations and rapid transient states in ferromagnetic nano-half-balls and wire systems with shape modifications — •Tomasz Blachowicz1 and Andrea Ehrmann2 — 1Institute of Physics, Silesian University of Technology, Gliwice, Poland — 2Hochschule Niederrhein, Faculty of Textile and Clothing Technology, Mönchengladbach, Germany
Hysteresis loops of 3D ferromagnetic nano-half-balls with 100 nm base diameter and different shape modifications have been examined using LLG micromagnetic simulations and finite element methods [1]. Depending on the direction of the externally applied field, strong oscillations of the magnetization can be recognized.
Comparing hysteresis loops with demagnetization and exchange energy densities and taking into account "snapshots" of the space-resolved magnetization, these oscillations can be attributed to different mechanisms, such as vortex precessions or domain wall oscillations. It can be shown that precession frequencies give rise to identification of the respective oscillation / precession mechanisms.
By taking into account different shape modifications, the simulations show feasible ways to diminish these oscillations, which can be critical in spin-valve systems, magnetic storage systems and other applications.
[1] T. Blachowicz, A. Ehrmann: Anatomy of Demagnetizing and Exchange Fields in Magnetic Nanodots Influenced by 3D Shape Modifications, Condensed Matter/Mesoscale and Nanoscale Physics arXiv.org preprint, cond-mat arXiv:1207.4673 (2012)