TY  - JOUR
AU  - Rüßmann, Philipp
AU  - Mahatha, Sanjoy K
AU  - Sessi, Paolo
AU  - Valbuena, Miguel A
AU  - Bathon, Thomas
AU  - Fauth, Kai
AU  - Godey, Sylvie
AU  - Mugarza, Aitor
AU  - Kokh, Konstantin A
AU  - Tereshchenko, Oleg E
AU  - Gargiani, Pierluigi
AU  - Valvidares, Manuel
AU  - Jiménez, Erika
AU  - Brookes, Nicholas B
AU  - Bode, Matthias
AU  - Bihlmayer, Gustav
AU  - Blügel, Stefan
AU  - Mavropoulos, Phivos
AU  - Carbone, Carlo
AU  - Barla, Alessandro
TI  - Towards microscopic control of the magnetic exchange coupling at the surface of a topological insulator
JO  - JPhys materials
VL  - 1
IS  - 1
SN  - 2515-7639
CY  - Bristol
PB  - IOP Publishing
M1  - FZJ-2018-06639
SP  - 015002
PY  - 2018
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000552655300001
DO  - DOI:10.1088/2515-7639/aad02a
UR  - https://juser.fz-juelich.de/record/857661
ER  -