Canted ferrimagnetism and giant coercivity in the nonstoichiometric double perovskite La2Ni1.19Os0.81O6

Hai L. Feng, Manfred Reehuis, Peter Adler, Zhiwei Hu, Michael Nicklas, Andreas Hoser, Shih-Chang Weng, Claudia Felser, and Martin Jansen
Phys. Rev. B 97, 184407 – Published 7 May 2018

Abstract

The nonstoichiometric double perovskite oxide La2Ni1.19Os0.81O6 was synthesized by solid-state reaction and its crystal and magnetic structures were investigated by powder x-ray and neutron diffraction. La2Ni1.19Os0.81O6 crystallizes in the monoclinic double perovskite structure (general formula A2BBO6) with space group P21/n, where the B site is fully occupied by Ni and the B′ site by 19% Ni and 81% Os atoms. Using x-ray absorption spectroscopy an Os4.5+ oxidation state was established, suggesting the presence of about 50% paramagnetic Os5+ (5d3, S=3/2) and 50% nonmagnetic Os4+ (5d4, Jeff=0) ions at the B′ sites. Magnetization and neutron diffraction measurements on La2Ni1.19Os0.81O6 provide evidence for a ferrimagnetic transition at 125 K. The analysis of the neutron data suggests a canted ferrimagnetic spin structure with collinear Ni2+-spin chains extending along the c axis but a noncollinear spin alignment within the ab plane. The magnetization curve of La2Ni1.19Os0.81O6 features a hysteresis with a very high coercive field, HC=41kOe, at T=5K, which is explained in terms of large magnetocrystalline anisotropy due to the presence of Os ions together with atomic disorder. Our results are encouraging to search for rare-earth-free hard magnets in the class of double perovskite oxides.

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  • Received 8 February 2018

DOI:https://doi.org/10.1103/PhysRevB.97.184407

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Hai L. Feng1, Manfred Reehuis2, Peter Adler1, Zhiwei Hu1, Michael Nicklas1, Andreas Hoser2, Shih-Chang Weng3, Claudia Felser1, and Martin Jansen1,4

  • 1Max Planck Institute for Chemical Physics of Solids, Dresden, D-01187, Germany
  • 2Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, D-14109, Germany
  • 3National Synchrotron Radiation Research Center (NSRRC), Hsinchu, 30076, Taiwan
  • 4Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany

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Issue

Vol. 97, Iss. 18 — 1 May 2018

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