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

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.

Elucidating the effect of Vx doped LaFe1−xO3 for advanced optical, spintronic, and thermoelectric devices

“…The difference in the RMT values is due to different electron configuration for Fe (Z Fe = 26, 3d 6 ) compared to V (Z V = 23, 3d 3 ). For example, in the double perovskite Sr 3 OsO 6 , the ionic radii of Sr and Os differ by a factor of 2 [27]. Our result agrees with that found for the double perovskite Sr 3 OsO 6 since the ionic radius decreases as we traverse from the left to the right in the periodic table due to the electron configuration.…”

Weak ferromagnetic insulator with huge coercivity in monoclinic double perovskite La2CuIrO6

“…The saturation magnetization (~11emu/cc or 0.15μ B /f.u. at 10K) is significantly smaller than that of typical magnetic metals like Nd 2 Fe 14 B (~1280 emu/cc), and typical ferrites like CoFe 2 O 4 (~430 emu/cc), but is comparable with the very recent reported Sr 3 OsO 6 (~49 emu/cc at 1.9K) [11]. The temperature dependence of M r /M s is displayed in Fig.…”

Quantum transport evidence of Weyl fermions in an epitaxial ferromagnetic oxide

“…O 3 gas ( 15% O 3 + 85% O 2 ) was introduced through an alumina nozzle pointed at the substrate. Further information about the MBE setup and preparation of the substrates is described elsewhere 60 . The surface morphology of our SrRuO 3 films is composed of atomically flat terraces and steps, as observed by atomic force microscopy 28 .…”