Towards microscopic control of the magnetic exchange coupling at the surface of a topological insulator

Philipp Rüßmann, Sanjoy K. Mahatha, Paolo Sessi, Miguel A. Valbuena, Thomas Bathon, Kai Fauth, Sylvie Godey, Aitor Mugarza, Konstantin A. Kokh, Oleg E. Tereshchenko, Pierluigi Gargiani, Manuel Valvidares, Erika Jiménez, Nicholas B. Brookes, Matthias Bode, Gustav Bihlmayer, Stefan Blügel, Phivos Mavropoulos, Carlo Carbone, Alessandro Barla

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

11 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаанглийский
Номер статьи015002
ЖурналJPhys Materials
Том1
Номер выпуска1
DOI
СостояниеОпубликовано - дек 2018

Предметные области OECD FOS+WOS

  • 2.05.PM МАТЕРИАЛОВЕДЕНИЕ, МУЛЬТИДИСЦИПЛИНАРНОЕ

Fingerprint

Подробные сведения о темах исследования «Towards microscopic control of the magnetic exchange coupling at the surface of a topological insulator». Вместе они формируют уникальный семантический отпечаток (fingerprint).

Цитировать