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Ferromagnetism above 1000 K in a highly cation-ordered double-perovskite insulator Sr3OsO6

Author

Listed:
  • Yuki K. Wakabayashi

    (NTT Corporation)

  • Yoshiharu Krockenberger

    (NTT Corporation)

  • Naoto Tsujimoto

    (The University of Tokyo)

  • Tommy Boykin

    (NTT Corporation)

  • Shinji Tsuneyuki

    (The University of Tokyo)

  • Yoshitaka Taniyasu

    (NTT Corporation)

  • Hideki Yamamoto

    (NTT Corporation)

Abstract

Magnetic insulators have wide-ranging applications, including microwave devices, permanent magnets and future spintronic devices. However, the record Curie temperature (TC), which determines the temperature range in which any ferri/ferromagnetic system remains stable, has stood still for over eight decades. Here we report that a highly B-site ordered cubic double-perovskite insulator, Sr3OsO6, has the highest TC (of ~1060 K) among all insulators and oxides; also, this is the highest magnetic ordering temperature in any compound without 3d transition elements. The cubic B-site ordering is confirmed by atomic-resolution scanning transmission electron microscopy. The electronic structure calculations elucidate a ferromagnetic insulating state with Jeff = 3/2 driven by the large spin-orbit coupling of Os6+ 5d2 orbitals. Moreover, the Sr3OsO6 films are epitaxially grown on SrTiO3 substrates, suggesting that they are compatible with device fabrication processes and thus promising for spintronic applications.

Suggested Citation

  • Yuki K. Wakabayashi & Yoshiharu Krockenberger & Naoto Tsujimoto & Tommy Boykin & Shinji Tsuneyuki & Yoshitaka Taniyasu & Hideki Yamamoto, 2019. "Ferromagnetism above 1000 K in a highly cation-ordered double-perovskite insulator Sr3OsO6," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-08440-6
    DOI: 10.1038/s41467-019-08440-6
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