Magnetization reversal induced by Mn substitution in spinel chromite NiCr2O4

Polycrystalline Ni(Cr1−xMnx)2O4 (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 TC. Remarkable magnetization reversal is observed b...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2018-12, Vol.101 (12), p.5571-5577
Main Authors: Li, Canglong, Yan, Tengyun, Zerihun, Gebru, Fu, Qingshan, Zhang, Run, Chen, Xinghan, Huang, Shuai, Yuan, Songliu
Format: Article
Language:English
Subjects:
Chromite
Compensation
Coupling
Crystallography
Ferrimagnetism
Magnetic fields
Magnetic switching
Magnetism
Magnetization reversal
magnetocaloric effect
Manganese
Materials substitution
Nickel
site preference
Site preference (crystals)
spinel chromite
switching effect
Transition temperature
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Summary:Polycrystalline Ni(Cr1−xMnx)2O4 (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 TC. Remarkable magnetization reversal is observed between the 2 compensation temperatures Tcomp1 and Tcomp2, which is regarded as arising from the negative exchange coupling between the 2 magnetic sublattices at different crystallographic sites. The magnetization is reversed at TSR due to spin‐reorientation caused by magnetostructural coupling. The spin‐reorientation is supported by Mn substitution and TSR 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.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.15869