Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 14: Surface Magnetism – Skyrmions (jointly with MA, O)
TT 14.5: Vortrag
Montag, 16. März 2015, 10:30–10:45, EB 301
Emergent electrodynamics in Mn1−xFexSi — •Christoph Schnarr, Felix Rucker, Christian Franz, Robert Ritz, Andreas Bauer, and Christian Pfleiderer — Lehrstuhl für Topologie korrelierter Systeme, Technische Universität München, Garching, Germany
The emergent electrodynamics of the skyrmion lattice phase in chiral magnets comprise of an emergent magnetic field of one flux quantum per skyrmion that gives rise to an emergent electric field, when the skyrmion lattice moves under the application of spin currents exceeding a critical current density jc [1,2]. We report a study of the emergent electrodynamics in Mn1−xFexSi, where we exploit a well understood increase of the topological Hall resistivity by an order of magnitude with increasing Fe concentration [3]. On the one hand, this allows us to track jc for increasing emergent magnetic field in the presence of increasing disorder. On the other hand, we observe evidence for emergent electric fields even in the magnetoresistance, reflecting, in combination with the emergent electric field in the Hall signal, the direction of motion of the skyrmion lattice.
F. Jonietz et al., Science 330, 6011, 1648-1651 (2010)
T. Schulz et al., Nature Physics 8, 4, 301-304 (2012)
C. Franz et al., Physical review letters 112, 18, 186601 (2014)