Regensburg 2019 – wissenschaftliches Programm
MA 7.15: Vortrag
Montag, 1. April 2019, 19:00–19:15, H37
Magnetic force microscopy investigation of spin textures in the ferromagnetic semimetal Fe3Sn2 — •Markus Altthaler1, Dennis Meier2, Mohammed Kassem3, Vladimir Tsurkan1, Stephan Krohns1, and István Kézsmárki1 — 1Experimentalphysik V, EKM, Universität Augsburg, 86135 Augsburg — 2Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway — 3Department of Physics, Assiut University, Assiut 71516, Egypt
Recently, Fe3Sn2 has been reported to exhibit a giant anomalous Hall effect  as well as a topological electronic structure  and to host magnetic skyrmions . Z. Hou et al.  suggested that both uniaxial magnetic anisotropy and frustration due to the Kagome lattice play a significant role in the formation of skyrmions at room temperature in this compound. Our goal was to specify in more details the driving force of skyrmion formation, namely whether exchange frustration or uniaxial anisotropy competing with long-range dipolar interactions stabilize the skyrmions. In contrast to former observations of magnetic spirals and skyrmions in sub-micron thin lamellas, on the surface of bulk crystals we did not find such modulated structures, instead a dendrite pattern with fascinating magnetic field evolution was observed. The fact that the stability of skyrmions is restricted to thin lamellas implies that the uniaxial anisotropy competing with dipolar interactions is the main drive of skyrmion formation in Fe3Sn2.
L. Ye et al., Nature 555 (2018), 638;  J.-X. Yin et al., Nature 562 (2018), 91;  Z. Hou et al., Adv. Mater. (2017), 1701144