Journal
SOLID STATE COMMUNICATIONS
Volume 152, Issue 5, Pages 403-406Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2011.11.047
Keywords
Surfaces and interfaces; Magnetically ordered materials; Spin-orbit effects
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Funding
- MEC-Spain [MAT07-67845, FIS2010-21883-C02-01, CSD2007-0010]
- Proyecto de Iniciacion en Investigacion Fondecyt [11070008]
- Nude Cientifico Milenio Magnetismo Basic y/o Aplicado [P06022-F]
- Universidad de Alicante
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We consider dilute magnetic doping in the surface of a three dimensional topological insulator where a two dimensional Dirac electron gas resides. We find that exchange coupling between magnetic atoms and the Dirac electrons has a strong and peculiar effect on both. First, the exchange-induced single ion magnetic anisotropy is very large and favors off-plane orientation. In the case of a ferromagnetically ordered phase, we find a colossal magnetic anisotropy energy, of the order of the critical temperature. Second, a persistent electronic current circulates around the magnetic atom and, in the case of a ferromagnetic phase, around the edges of the surface. (C) 2011 Elsevier Ltd. All rights reserved.
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