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

Yuki K. Wakabayashi (), Yoshiharu Krockenberger, Naoto Tsujimoto, Tommy Boykin, Shinji Tsuneyuki, Yoshitaka Taniyasu and Hideki Yamamoto
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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

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-08440-6

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