Canted ferrimagnetism and giant coercivity in the nonstoichiometric double perovskite La2Ni1.19Os0.81O6
作者： Hai L. Feng , Manfred Reehuis , Peter Adler , Zhiwei Hu , Michael Nicklas
DOI: 10.1103/PHYSREVB.97.184407
关键词: Ferrimagnetism 、 Magnetization 、 Coercivity 、 Paramagnetism 、 Crystallography 、 Crystal 、 Magnetocrystalline anisotropy 、 Neutron diffraction 、 Materials science 、 Monoclinic crystal system
摘要: The non-stoichiometric double perovskite oxide La2Ni1.19Os0.81O6 was synthesized by solid state reaction and its crystal magnetic structures were investigated powder x-ray neutron diffraction. crystallizes in the monoclinic structure (general formula A2BB'O6) with space group P21/n, where B site is fully occupied Ni B' 19 % 81 Os atoms. Using absorption spectroscopy an Os4.5+ oxidation established, suggesting presence of about 50 paramagnetic Os5+ (5d3, S = 3/2) non-magnetic Os4+ (5d4, Jeff 0) ions at sites. Magnetization diffraction measurements on provide evidence for a ferrimagnetic transition 125 K. analysis data suggests canted spin collinear Ni2+ chains extending along c axis but non-collinear alignment within ab plane. magnetization curve features hysteresis very high coercive field, HC 41 kOe, T 5 K, which explained terms large magnetocrystalline anisotropy due to together atomic disorder. Our results are encouraging search rare earth free hard magnets class oxides.
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