Colossal anisotropy in diluted magnetic topological insulators |
| |
| Authors: | AS Núñez J Fernández-Rossier |
| |
| Institution: | 1. Leibniz-Institute for Solid State and Material Research, IFW-Dresden, 01171 Dresden Germany;2. Research Center for Environmentally Friendly Materials Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, Hokkaido, 050-8585, Japan;3. Center for Transport and Devices of Emergent Materials, Technische Universität Dresden, 01069 Dresden, Germany;4. Institut für Festkörperphysik, Technische Universität Dresden, 01069 Dresden, Germany;1. Institute of Automation and Control Processes FEB RAS, 5 Radio Street, 690041 Vladivostok, Russia;2. School of Natural Sciences, Far Eastern Federal University, 690950 Vladivostok, Russia;3. Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei, Taiwan;4. Department of Electronics, Vladivostok State University of Economics and Service, 690600 Vladivostok, Russia |
| |
| Abstract: | 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. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
