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Magnetization reversal induced by Mn substitution in spinel chromite NiCr 2 O 4
Author(s) -
Li Canglong,
Yan Tengyun,
Zerihun Gebru,
Fu Qingshan,
Zhang Run,
Chen Xinghan,
Huang Shuai,
Yuan Songliu
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15869
Subject(s) - magnetization , ferrimagnetism , condensed matter physics , magnetic refrigeration , spinel , materials science , remanence , crystallite , non blocking i/o , ionic radius , coupling (piping) , nuclear magnetic resonance , magnetic field , chemistry , ion , physics , metallurgy , biochemistry , organic chemistry , quantum mechanics , catalysis
Polycrystalline Ni(Cr 1− x Mn x ) 2 O 4 (0.1 ≤ x ≤ 0.325) ceramic samples were studied through different protocols of dc magnetization measurements. The samples exhibit 2 kinds of magnetic compensation effects below the ferrimagnetic transition temperature T C . Remarkable magnetization reversal is observed between the 2 compensation temperatures T comp1 and T comp2 , which is regarded as arising from the negative exchange coupling between the 2 magnetic sublattices at different crystallographic sites. The magnetization is reversed at T SR due to spin‐reorientation caused by magnetostructural coupling. The spin‐reorientation is supported by Mn substitution and T SR is increased to 96 K when x reaches 0.325. However, it is suppressed due to the strong ionic site preference and thus the magnetization is slightly increased in the negative direction of the magnetic field. Near the 2 compensation temperatures, tunable magnetic switching effects can be obtained just by changing the magnitude of the applied magnetic field. Moreover, both normal and inverse magnetocaloric effects were also demonstrated.