Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 41: CE: Spin Systems and Itinerant Magnets 1
TT 41.4: Vortrag
Mittwoch, 16. März 2011, 19:00–19:15, HSZ 105
Spin Transfer Torques in MnSi at Ultra-low Current Densities — •F. Jonietz1, S. Mühlbauer1,2, C. Pfleiderer1, A. Neubauer1, W. Münzer1, A. Bauer1, T. Adams1, T. Schulz1, M. Wagner1, R. Georgii1,2, P. Böni1, R. A. Duine3, K. Everschor4, M. Garst4, and A. Rosch4 — 1Physik-Department E21, Technische Universität München, D-85748 Garching, Germany — 2Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universität München, D-85748 Garching, Germany — 3Institute for Theoretical Physics, Utrecht University, 3584 CE Utrecht, The Netherlands — 4Institute of Theoretical Physics, University of Cologne, D-50937 Cologne, Germany
Spin manipulation using electric currents is one of the most promising directions in the field of spintronics. We used neutron scattering to observe the influence of an electric current on the magnetic structure in a bulk material. In the skyrmion lattice of MnSi, where the spins form a lattice of magnetic vortices similar to the vortex lattice in type II superconductors [1], we observe the rotation of the diffraction pattern in response to currents [2] which are over five orders of magnitude smaller than those typically applied in experimental studies on current-driven magnetization dynamics in nanostructures. We attribute our observations to an extremely efficient coupling of inhomogeneous spin currents to topologically stable knots in spin structures.
S. Mühlbauer, et al. Science 323, 5916 (2009)
F. Jonietz, et al. Science, in press (2010)