Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 12: Topological insulators: mostly interaction with magnetic fields (with HL/O/TT)

MA 12.8: Vortrag

Montag, 31. März 2014, 17:30–17:45, POT 081

Strong Out-of-Plane Magnetic Anisotropy of Fe Adatoms on Bi₂Te₃ — •Thomas Eelbo¹, Marta Waśniowska¹, Marcin Sikora², Michal Dobrzański², Andrzej Kozlowski², Artem Pulkin³, Gabriel Autès³, Ireneusz Miotkowski⁴, Oleg Yazyev³, and Roland Wiesendanger¹ — ¹Institute of Applied Physics, University of Hamburg, Germany — ²Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Krakow, Poland — ³Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland — ⁴Department of Physics, Purdue University, West Lafayette, USA

Topological insulators (TIs) are currently in the focus of fundamental physics. The interaction of magnetic impurities with TIs is widely unexplored on the local scale and might potentially entail interesting properties of the TIs in view of applications in spintronics. To this end, we studied the structural, electronic, and magnetic properties of individual Fe atoms adsorbed on a Bi₂Te₃(111) surface by means of scanning tunneling microscopy/spectroscopy (STM/STS), X-ray absorption spectroscopy and X-ray magnetic circular dichroism (XMCD) at low temperatures. STM reveals the existence of two different Fe species. Density functional theory-based calculations let us assign these to atoms adsorbed on the fcc/hcp hollow sites. STS proves the existence of characteristic resonances for each type and XMCD evidences a strong magnetic out-of-plane anisotropy of the Fe moments in agreement with our calculations.