Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)
MA 18.63: Poster
Dienstag, 26. Februar 2008, 15:15–18:30, Poster E
Numerical investigation of geometrically confined domain walls and spin torque using the Heisenberg model — •C. Schieback1, U. Nowak2, M. Kläui1, D. Backes1,3, L. J. Heydermann3, U. Rüdiger2, and P. Nielaba1 — 1Department of Physics, University of Konstanz, 78457 Konstanz, Germany — 2Department of Physics, University of York, York YO10 5DD, UK — 3Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, CH-5232 Villingen PSI, Switzerland
Computer simulations are preformed on a classical spin model. Thermal activation of the system is taken into account by numerically solving the Landau-Lifshitz-Gilbert equation with Langevin dynamics.
Using this model, we study systematically the influence of lateral constrictions on the spin structure of transverse domain walls in permalloy nano-structures. The domain wall width is strongly correlated with the constriction width. Reduced constriction width leads to a superlinear scaling of the wall width [1]. Furthermore we calculate the response of a domain wall to a current due to a spin transfer torque resulting in current-induced domain wall motion. We compute the behavior of domain walls in a one dimensional chain when currents are injected using adiabatic and non-adiabatic spin torque terms [2]. Our results are compared to analytical calculations and are found to agree very well for small current density predictions.
[1] D. Backes et al., APL 91, 112502 (2007). [2] C. Schieback et al., EPJ B, DOI:10.1140/epjb/e2007-00062-2