Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 24: Topological insulators: mostly interaction with magnetic fields (with MA/TT)

HL 24.8: 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 Wiesendanger11Institute 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.

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