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arXiv · 1403.7621

Strong out-of-plane magnetic anisotropy of Fe adatoms on Bi$_2$Te$_3$

T. Eelbo·M. Waśniowska·M. Sikora·M. Dobrzański·A. Kozłowski·A. Pulkin·G. Autès·I. Miotkowski·O. V. Yazyev·R. Wiesendanger
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Abstract

The electronic and magnetic properties of individual Fe atoms adsorbed on the surface of the topological insulator Bi$_2$Te$_3$(111) are investigated. Scanning tunneling microscopy and spectroscopy prove the existence of two distinct types of Fe species, while our first-principles calculations assign them to Fe adatoms in the hcp and fcc hollow sites. The combination of x-ray magnetic circular dichroism measurements and angular dependent magnetization curves reveals out-of-plane anisotropies for both species with anisotropy constants of $K_{\text{fcc}} = (10 \pm 4)$ meV/atom and $K_{\text{hcp}} = (8 \pm 4)$ meV/atom. These values are well in line with the results of calculations.

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T. Eelbo, M. Waśniowska, M. Sikora, M. Dobrzański, A. Kozłowski, A. Pulkin, G. Autès, I. Miotkowski, O. V. Yazyev, R. Wiesendanger. 2014-03-29. Strong out-of-plane magnetic anisotropy of Fe adatoms on Bi$_2$Te$_3$. https://doi.org/10.1103/physrevb.89.104424

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