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MA: Fachverband Magnetismus
MA 18: Magnetic Thin Films II
MA 18.1: Vortrag
Mittwoch, 24. März 2010, 15:15–15:30, H3
Dzyaloshinskii-Moriya interactions due to internal strains in nanostructures: An ab-initio study — •Philipp Beck1 and Manfred Fähnle2 — 1Institut für Theoretische und Angewandte Physik, Universität Stuttgart — 2Max-Planck-Institut für Metallforschung, Stuttgart
Artificial nanostructures such as ferromagnetic thin films, multilayers, nanowires etc. often lack structural inversion symmetry, giving rise to a chiral asymmetry of the exchange couplings due to Dzyaloshinskii-Moriya interactions and to single-handed spin structures [1,2,3]. Thereby, one source for the structural symmetry breaking are
internal strains originating from relaxation effects at free surfaces and interfaces or from lattice mismatches in epitaxial films. In the present contribution the strain-induced Dzyaloshinskii-Moriya interactions in iron are determined by a combination of the ab-initio density functional electron theory with a micromagnetic model.
[1] A.N. Bogdanov, U.K. Rössler, Phys.Rev.Lett. 87, 037203 (2001).
[2] M. Bode et al., Nature 447, 190 (2007).
[3] M. Heide, G. Bihlmayer, S. Blügel, Phys.Rev.B 78, 140403 (2008).