Journal Article

FZJ-2018-06639

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Towards microscopic control of the magnetic exchange coupling at the surface of a topological insulator

Rüßmann, P. (Corresponding author)FZJ* ; Mahatha, S. K. ; Sessi, P. ; Valbuena, M. A. ; Bathon, T. ; Fauth, K. ; Godey, S. ; Mugarza, A. ; Kokh, K. A. ; Tereshchenko, O. E. ; Gargiani, P. ; Valvidares, M. ; Jiménez, E. ; Brookes, N. B. ; Bode, M. ; Bihlmayer, G.FZJ* ; Blügel, S.FZJ* ; Mavropoulos, P.FZJ* ; Carbone, C. ; Barla, A. (Corresponding author)

2018
IOP Publishing Bristol

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Please use a persistent id in citations: http://hdl.handle.net/2128/20971  doi:10.1088/2515-7639/aad02a

Abstract: Magnetically doped topological insulators may produce novel states of electronic matter, where for instance the quantum anomalous Hall effect state can be realized. Pivotal to this goal is a microscopic control over the magnetic state, defined by the local electronic structure of the dopants and their interactions. We report on the magnetic coupling among Mn or Co atoms adsorbed on the surface of the topological insulator Bi2Te3. Our findings uncover the mechanisms of the exchange coupling between magnetic atoms coupled to the topological surface state in strong topological insulators. The combination of x-ray magnetic circular dichroism and ab initio calculations reveals that the sign of the magnetic coupling at short adatom–adatom distances is opposite for Mn with respect to Co. For both elements, the magnetic exchange reverses its sign at a critical distance between magnetic adatoms, as a result of the interplay between superexchange, double exchange and Ruderman–Kittel–Kasuya–Yoshida interactions.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IAS-1)
2. Quanten-Theorie der Materialien (PGI-1)
3. JARA-FIT (JARA-FIT)
4. JARA - HPC (JARA-HPC)

Research Program(s):

1. 142 - Controlling Spin-Based Phenomena (POF3-142) (POF3-142)
2. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)
3. Scattering of topologically protected states off defects in topological insulators (jara0078_20131101) (jara0078_20131101)

Appears in the scientific report 2018

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