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Electrically-induced ferromagnetism in diamagnetic FeS<sub>2</sub>

ORAL

Abstract

Recent years have seen increasingly impressive demonstrations of all-electrical control of magnetism, including electrolyte-gating-induced ferromagnetism in non-ferromagnetic materials. These demonstrations, however, involve induction of ferromagnetism from some other finite-spin magnetic state, e.g., antiferromagnetic, paramagnetic, etc. In this work we use ionic liquid gating, which can induce electron densities >1014 cm-2, to achieve voltage-induced ferromagnetism in diamagnetic (i.e., zero-spin) FeS2 single crystals. Temperature-dependent transport measurements establish a remarkably reversible positive-bias-induced insulator-metal transition, accompanied by inversion of the FeS2 surface conduction channel to n-type. Anomalous Hall effect measurements then reveal an accompanying onset of voltage-induced soft 2D ferromagnetism, with Curie temperature up to ~20 K. These results are supported by DFT-based tight-binding modelling that indicates induction of Stoner FM by gate-controlled band filling.

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Presenters

  • Jeff Walter

    Department of Physics, Augsburg University

Authors

  • Jeff Walter

    Department of Physics, Augsburg University

  • Bryan Voigt

    University of Minnesota, Chemical Engineering & Materials Science, University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota

  • Ezra Day-Roberts

    University of Minnesota, School of Physics and Astronomy, University of Minnesota

  • Kei Heltemes

    Department of Physics, Augsburg University

  • Turan Birol

    Chemical Engineering and Materials Science, University of Minnesota Twin Cities, University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota, University of Minnesota, Department of Chemical Engineering and Materials Science

  • Rafael Fernandes

    University of Minnesota, Physics, University of Minnesota, School of Physics and Astronomy, University of Minnesota

  • Chris Leighton

    Chemical Engineering & Materials Science, University of Minnesota, Chemical Engineering and Materials Science, University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota