Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Postersession Correlated Electrons: Metal Insulator Transition, Spin Systems and Itinerant Magnets
TT 33.23: Poster
Mittwoch, 25. März 2009, 14:00–18:00, P1A
Manipulating magnetic structures in chiral metals by currents — •Karin Everschor1, Achim Rosch1, and Rembert Duine2 — 1Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln — 2Institute for Theoretical Physics, Department of Physics and Astronomy Faculteit Betawetenschappen, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands
We investigate how currents can modify magnetic structures in bulk materials. In magnets without inversion symmetry, weak spin-orbit coupling leads to the formation of magnetic helices with a long pitch. These helices pin only very weakly to disorder and the underlying crystalline lattice. We start from the Landau-Lifshitz-Gilbert equation including adiabatic and non-adiabatic spin transfer torques. We investigate a variational approach to determine equations of motion for different magnetic structures. Especially interesting is the influence of currents on the so-called ``A-phase'' of MnSi, where a lattice of skyrmions forms.