Canted ferrimagnetism and giant coercivity in the nonstoichiometric double perovskite L a2 N i1.19 O s0.81 O6
Feng HL, Reehuis M, Adler P, Hu Z, Nicklas M, Hoser A, Weng SC, Felser C, Jansen M (2018)
Publication Type: Journal article
Publication year: 2018
Journal
Book Volume: 97
Article Number: 184407
Journal Issue: 18
DOI: 10.1103/PhysRevB.97.184407
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 A2BB′O6) 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.
Involved external institutions
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
Germany (DE)
National Synchrotron Radiation Research Center (NSRRC)
Taiwan (TW)
Germany (DE)
Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
Germany (DE)
National Synchrotron Radiation Research Center (NSRRC)
Taiwan (TW)
How to cite
APA:
Feng, H.L., Reehuis, M., Adler, P., Hu, Z., Nicklas, M., Hoser, A.,... Jansen, M. (2018). Canted ferrimagnetism and giant coercivity in the nonstoichiometric double perovskite L a2 N i1.19 O s0.81 O6. Physical Review B, 97(18). https://doi.org/10.1103/PhysRevB.97.184407
MLA:
Feng, Hai L., et al. "Canted ferrimagnetism and giant coercivity in the nonstoichiometric double perovskite L a2 N i1.19 O s0.81 O6." Physical Review B 97.18 (2018).
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