The magnetic ordering of the normal spinel ferrimagnet NiCr 2 O 4 below T C = 74 K was reinvestigated by neutron scattering and magnetization measurements on a powder specimen. We found another magnetic transition at T S = 31 K besides T C in both experiments. The ordering of a ferrimagnetic (longitudinal) component and that of an antiferromagnetic (transverse) component occur at T C and T S , separately. A new magnetic structure model of NiCr 2 O 4 below T S with a spontaneous magnetization of about 0.3 µ B /formula is proposed based on experimental neutron scattering intensity.
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Tomiyasu et al. (2004) studied this question.
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