This article is cited in 19 papers

CONDENSED MATTER

Carrier mediated ferromagnetism on the surface of a topological insulator

V. N. Men'shov^a, V. V. Tugushev^a, E. V. Chulkov<sup>b

a</sup> Russian Research Centre "Kurchatov Institute", Moscow
^b Departamento de Física de Materiales, Facultad de Quimica, UPV/EHU, San Sebastian, Basque Country

Abstract: We study the effect of magnetic doping at the surface of a three dimensional topological insulator (TI) on emergence of ferromagnetic ordering at the TI-surface assuming the exchange coupling between the Dirac fermions and the dilute magnetic ions. We show that this coupling results in an uniaxial magnetic anisotropy with out-of-plane magnetization direction. It is found that the system under consideration is unstable with respect to a spontaneous uniform magnetization along the easy axis, which is accompanied by opening a gap in a spectrum of the Dirac surface states. In the framework of a mean-field approach, we study the possibility of ferromagnetic order on the magnetically doped surface of TI at different temperatures and positions of the chemical potential.

Received: 06.09.2011

Language: English

 English version: Journal of Experimental and Theoretical Physics Letters, 2011, 94:8, 629–634

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