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Electronic structure of Fe and Co magnetic adatoms on Bi_{2}Te_{3} surfaces

DOI: 10.1103/PhysRevB.86.081304 DOI Help

Authors: L. Shelford (Diamond Light Source) , T. Hesjedal (University of Oxford) , L. Collins-mcintyre (University of Oxford) , F. Maccherozzi (Diamond Light Source) , S. Dhesi (Diamond Light Source) , G. Van Der Laan (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 86 (8)

State: Published (Approved)
Published: August 2012
Diamond Proposal Number(s): 7345

Abstract: Magnetic doping of topological insulators (TIs) is a prerequisite for their application as spin-based devices. Using x-ray magnetic circular dichroism (XMCD) we investigate the influence of an ultralow coverage (0.5% of a ml) of magnetic atoms on a TI substrate. For Fe and Co adatoms on Bi2 Te3 at 1.5 K we find an orbital-to-spin magnetic moment ratio of 0.45. The magnetization curve of the Fe atoms recorded by XMCD is in quantitative agreement with a paramagnetic behavior with no indication of long-range magnetic order. The spectral shape of the XMCD indicates that the adatoms are weakly hybridized with the substrate and form narrowband states. The results show that the adatoms are not capable of breaking time-reversal symmetry.

Subject Areas: Chemistry

Instruments: I06-Nanoscience

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