Regensburg 2010 – wissenschaftliches Programm

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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 Fähnle21Institut 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).

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