Bistability and relaxor ferrimagnetism in off-stoichiometric NiCrO3
Bistability and relaxor ferrimagnetism in off-stoichiometric NiCrO3
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DOI：
10.1016/j.jmmm.2017.07.045
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发表时间：
2017-12
影响因子：
2.7
通讯作者：
A. Kusmartseva;Á. Arévalo-López;M. Halder;J. Attfield
中科院分区：
文献类型：
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作者：
A. Kusmartseva;Á. Arévalo-López;M. Halder;J. Attfield
NiCrO3has been proposed as a likely candidate for antiferromagnetic half metallic behaviour. A sample prepared at high pressure adopts the corundum structure with Ni/Cr cation disorder, and is found to have off-stoichiometric composition Ni0.80Cr1.20O3. This material shows complex local magnetic ordering phenomena at temperatures below 120 K but without any long range spin order observed by neutron diffraction. The transition to local ferrimagnetism occurs at 50–100 K, with two distinct regimes atTC1= 95 andTC2= 53 K evidencing electronic phase separation driven by variations in local composition. At low temperature the system undergoes a further transition atTC3= 22 K, assigned to potential freezing of a cluster glass-like state, that results in a substantial increase in magnetic anisotropy. Ni0.80Cr1.20O3is a bistable relaxor ferrimagnet where magnetic properties are linked to the lattice strain manifold that is determined by the peculiarities in the local chemical composition.
