Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 91: Poster IIIb (Joint session of DS and HL, organized by HL)

HL 91.5: Poster

Donnerstag, 10. März 2016, 16:00–19:00, Poster A

Magnetization dynamics of the Skyrmion cuprate Cu₂OSeO₃ — •Evgeniia Slivina¹, Prashant Padmanabhan¹, Rolf B. Versteeg¹, Petra Becker², and Paul H. M. van Loosdrecht¹ — ¹Physics Institute 2, University of Cologne, 50937 Cologne, Germany — ²Institute for Crystallography, University of Cologne, 50939 Cologne, Germany

In chiral crystal structures, the competition between the Heisenberg exchange and Dzyaloshinskii-Moriya exchange leads to a helimagnetic ground state ordering. Interestingly, under the presence of an external magnetic field, the Zeeman interaction energy stabilizes the formation of topologically robust nanometer-sized Skyrmion spin-vortices. Recently, ultrafast inverse Faraday effect measurements have been used to address the fundamental magnetic relaxation processes of the Skyrmion lattice in the cuprate material Cu₂OSeO₃. Here, we extend upon these findings by employing the time-resolved magneto-optical Kerr effect (TR-MOKE). In addition, we investigate the time-domain dynamics of the weakly fluctuating regime at the boundary between the helical, conical, and paramagnetic phase.