Room Temperature Ferromagnetism on the Topological Insulators Surface by Proximity Effect

ORAL

Abstract

Generating exchange-induced ferromagnetism on the surface of a topological insulator (TI) with a ferromagnetic layer (FM) provides a cleaner approach for realizing a ferromagnetic TI that may lead to exhibiting other quantum functionality.$^{\mathrm{1}}$ Here we demonstrate further that room temperature magnetic state may be reached in the TI and FM heterostructures through magnetic proximity-induced time reversal symmetry breaking on the TI surface. Using different magnetic characterization methods we provide evidence of this enhanced proximity-induced magnetism in TI. We show that such effects persist up to room temperature, far above the Curie temperature of the FM, signifying a significantly different behavior in TI. The project supported by grants NSF (DMR-1207469), MIT MRSEC through the MRSEC Program of the NSF (DMR-0819762) and NSF (ECCS-1402738). 1. ``Exchange-Coupling-Induced Symmetry Breaking in Topological Insulators'', Peng Wei, et al, PRL. 110, 186807 (2013).

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Authors

  • Ferhat Katmis

    • Francis Bitter Magnet Lab, MIT
    • MIT

  • Valeria Lauter

    • Oak Ridge National Lab.
    • Oak Ridge National Laboratory, Oak Ridge, USA

  • Vahid Sazgari

    • Sabanci University

  • Ismet I. Kaya

    • Sabanci University

  • Don Heiman

    • Northeastern University
    • Department of Physics, Northeastern University, Boston, USA

  • Jagadeesh Moodera

    • Department of Physics and Francis Bitter Magnet Lab, MIT
    • MIT
    • Deparment of Physics, MIT, Cambridge, MA-02139, USA
    • Massachusetts Institute of Technology