Neutron as a probe to study magnetization reversal in a spinel compound, CoCr^sub 1.9^Fe^sub 0.1^O^sub 4

Neutron depolarization and neutron diffraction techniques have been employed to investigate the origin of magnetization reversal in CoCr1.9Fe0.1O4 spinel compound. The spinel compound crystallizes in a face centered cubic (space group: Fd-3m) structure where Co2+ and (Cr/Fe)3+ ions occupy the tetrah...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2018-12, Vol.551, p.104
Main Authors: Kumar, Amit, Yusuf, SM
Format: Article
Language:English
Subjects:
Antiferromagnetism
Chromium
Cobalt
Crystal structure
Depolarization
Diffraction
Iron
Lattices (mathematics)
Magnetic moments
Magnetism
Magnetization curves
Magnetization reversal
Neutron diffraction
Neutrons
Spinel
Subgroups
Temperature
Temperature dependence
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Summary:Neutron depolarization and neutron diffraction techniques have been employed to investigate the origin of magnetization reversal in CoCr1.9Fe0.1O4 spinel compound. The spinel compound crystallizes in a face centered cubic (space group: Fd-3m) structure where Co2+ and (Cr/Fe)3+ ions occupy the tetrahedral 8a and octahedral 16d sites, respectively. The temperature dependent magnetization curves for magnetic fields = 1 kOe show a magnetization reversal below the compensation temperature (Tcomp ~ 40 K). The neutron depolarization measurements infer that the average magnetization of each domain becomes negligibly small at the TComp. Temperature dependent neutron diffraction study, a microscopic tool to understand sublattice magnetization, infers an antiparallel coupling between the tetrahedral (Co) and octahedral (Cr/Fe) site moments with ordered magnetic moments of -3.1(1) and 1.0(1) µB, respectively, at 30 K. Our neutron diffraction study also reveals that the unequal growth of the antiferromagnetically coupled tetrahedral and octahedral site moments across the TComp plays an important role in realizing the magnetization reversal in this spinel compound.
ISSN:0921-4526
1873-2135