Abstract
The electronic and magnetic properties of individual Fe atoms adsorbed on the surface of the topological insulator (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 meV/atom and meV/atom. These values are well in line with the results of calculations.
- Received 8 October 2013
- Revised 6 March 2014
DOI:https://doi.org/10.1103/PhysRevB.89.104424
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