Well-controlled exchange bias effect in MnO@Mn3O4 core-shell nanoparticles with an inverted coupling structures

The influence of the varied thickness of antiferromagnetic (AFM) and ferrimagnetic (FiM) nanostructure in MnO@Mn3O4 core-shell nanoparticles (NPs) on the exchange bias effect has been investigated. The MnO@Mn3O4 core-shell NPs with varied radius of MnO core (R MnO ) and thickness of Mn3O4 shell (T M...

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Bibliographic Details
Published in:AIP advances 2017-04, Vol.7 (4), p.045316-045316-7
Main Authors: Song, Ningning, Yang, Haitao, Luo, Yi, Ren, Xiao, Zhou, Jun, Geng, Sai, Zhao, Guoping, Zhang, Xiangqun, Cheng, Zhaohua
Format: Article
Language:English
Subjects:
Antiferromagnetism
Bias
Core-shell particles
Coupling
Exchanging
Ferrimagnetism
Manganese oxides
Nanoparticles
Oxidation
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Summary:The influence of the varied thickness of antiferromagnetic (AFM) and ferrimagnetic (FiM) nanostructure in MnO@Mn3O4 core-shell nanoparticles (NPs) on the exchange bias effect has been investigated. The MnO@Mn3O4 core-shell NPs with varied radius of MnO core (R MnO ) and thickness of Mn3O4 shell (T Mn3O4 ) have been synthesized by in-situ oxidation of the pure MnO NPs in organic solution containing a mild oxidant at different temperatures. The exchange bias effect can be tuned by changing the R MnO (T Mn3O4 ) of the MnO@Mn3O4 core-shell NPs. The strongest exchange coupling effect of both 17.2 and 25.0 nm MnO@Mn 3 O 4 core-shell NPs occur when R MnO =T Mn3O4= R/2. It is expected that the finding of the control of exchange bias effect by varied R MnO and T Mn3O4 in inverted core-shell NPs is helpful for the further understanding of the exchange bias mechanism.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4979919