Room-temperature ferromagnetic insulating state in highly cation-ordered Sr<sub>2</sub>Fe<sub>1+x</sub>Re<sub>1-x</sub>O<sub>6</sub> films

ORAL

Abstract

Ferromagnetic insulators with high Curie temperatures are critical components for developing quantum electronic/spintronic devices. However, since ferromagnetism generally accompanies metallicity, ferromagnetic insulators have been very limited in nature. Here, we report a highly insulating ferromagnetic state found in 3d-5d double perovskite Sr2Fe1+xRe1-xO6 (-0.2<x<0.2) epitaxial films by modifying the Fe/Re ratio. Beyond the original ferromagnetic metallic ground state in a stoichiometric film, Fe-rich films showed demanding ferromagnetic insulating states with three orders of higher room-temperature resistance than that of the metallic film, a high Curie temperature about 400 K, and a large saturated magnetization about 1.8 uB/f.u. In this presentation, we discuss about the growth, related physical properties, and the origin of the emerging ferromagnetic insulating state based on x-ray and optical spectroscopy.

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This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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Presenters

  • Chang Hee Sohn

    • Materials Science and Technology Division, Oak Ridge National Laboratory

Authors

  • Chang Hee Sohn

    • Materials Science and Technology Division, Oak Ridge National Laboratory

  • Elizabeth Skoropata

    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Materials Sciences and Technology Division, Oak Ridge National Laboratory

  • Yongseong Choi

    • Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory
    • Advanced Photon Source
    • Argonne National Lab

  • Xiang Gao

    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Materials Sciences and Technology Division, Oak Ridge National Laboratory

  • Ankur Rastogi

    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Materials Sciences and Technology Division, Oak Ridge National Laboratory

  • Amanda Huon

    • Department of Materials Science & Engineering, Drexel University

  • Michael A McGuire

    • Oak Ridge National Lab
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory

  • Lauren Nuckols

    • Department of Materials Science and Engineering, University of Tennessee

  • Yanwen Zhang

    • Materials Science and Technology Division, Oak Ridge National Laboratory

  • John William Freeland

    • Advanced Photon Source, Argonne National Laboratory
    • Advanced Photon Source

  • Daniel Haskel

    • Advanced Photon Source, Argonne National Laboratory
    • Advanced Photon Source
    • Argonne National Lab

  • Ho Nyung Lee

    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Materials Sciences and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory