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).

–

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