Electric-Field-Induced Ferromagnetism via Cluster Percolation in Ion-Gel-Gated La1-xSrxCoO3-δ Films

ORAL

Abstract

Electrolyte gating techniques have proven remarkably effective in the study of charge density effects in a variety of conductors. The ability to controllably induce surface charge densities > 1014 cm-2 has led to their extensive use in the study of superconductivity, insulator-metal transitions, and magnetism. In this work we apply electrolyte gating to epitaxial films of La1-xSrxCoO3-δ (LSCO), seeking gate-control of ferromagnetism. Our previous work provided direct evidence of oxygen vacancy creation at positive bias, vs. electrostatic hole accumulation at negative bias, using transport as well as in operando X-ray synchrotron and polarized neutron reflectometry (PNR) measurements [1]. Here, we present detailed gate-control over resistivity, magnetoresistance, magnetization, and Curie temperature under hole accumulation, including gate-induced ferromagnetism verified by PNR. These are discussed in terms of recently developed theory for electrolyte-gate-induced percolation [2].
[1] Walter et al., ACS Nano 10, 7799 (2016). Walter et al., Phys. Rev. Mater., under review (2017).
[2] Orth et al., Phys. Rev. Lett. 118, 106801 (2017)

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Presenters

  • Jeffery Walter

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

Authors

  • Jeffery Walter

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

  • Biqiong Yu

    School of Physics and Astronomy, University of Minnesota

  • Guichuan Yu

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

  • Alexander Grutter

    NIST Center for Neutron Research, National Institute of Standards and Technology, National Institute of Standards & Technology, NIST Center for Neutron Research, NIST -Natl Inst of Stds & Tech, NIST -Natl Inst of Stds & Tech

  • Brian Kirby

    NIST Center for Neutron Research, NIST Center for Neutron Research, National Institute of Standards and Technology

  • Julie Borchers

    NIST Center for Neutron Research, National Institute of Standards and Technology, National Institute of Standards & Technology, NIST Center for Neutron Research, NIST -Natl Inst of Stds & Tech, NIST -Natl Inst of Stds & Tech, NIST Center for Neutron Research, NIST Center for Neutron Research, NIST

  • Zhan Zhang

    Advanced Photon Source, Argonne National Laboratory, X-ray Science Division, Argonne National Lab

  • Hua Zhou

    Advanced Photon Source, Argonne National Laboratory

  • Timothy Charlton

    Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Lab

  • Haile Ambaye

    Neutron Scattering Division, Oak Ridge National Laboratory

  • Michael Fitzsimmons

    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Lab, Oak Ridge National Laboratory

  • Peter Orth

    Department of Physics and Astronomy, Iowa State University, Iowa state university/Ames Laboratory, Department of Physics and Astronomy & Ames Laboratory, Iowa State University

  • Rafael Fernandes

    School of Physics and Astronomy, University of Minnesota, School of Physics and Astronomy , University of Minnesota, School of Physics and Astronomy, Univ of Minnesota - Twin Cities, Univ of Minn - Minneapolis, School of Phys., Univ. of Minnesota - Minneapolis, University of Minnesota

  • Boris Shklovskii

    Fine Theoretical Physics Institute, University of Minnesota

  • Turan Birol

    Chemical Engineering and Materials Science, University of Minnesota, Chemical Engineering and Material Science, University of Minnesota, CEMS, University of Minnesota, Department of chemical engineering and materials science,University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota, Univ of Minnesota - Twin Cities, Chemical Engineering and Materials Science, university of minnesota

  • Martin Greven

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

  • Chris Leighton

    University of Minnesota, Chemical Engineering and Materials Science, University of Minnesota, Chemical Engineering and Materials Science, Univ of Minnesota - Twin Cities