Open AccessWell-controlled exchange bias effect in MnO@Mn3O4 core-shell nanoparticles with an inverted coupling structures
Author(s) -
Ningning Song,
Haitao Yang,
Yi Luo,
Xiao Ren,
Jùn Zhou,
Sai Geng,
Guoping Zhao,
Xiang-Qun Zhang,
ZhaoHua Cheng
Publication year - 2017
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4979919
Subject(s) - ferrimagnetism , exchange bias , nanoparticle , shell (structure) , antiferromagnetism , nanostructure , materials science , core (optical fiber) , coupling (piping) , nanotechnology , chemical engineering , condensed matter physics , magnetization , composite material , physics , magnetic anisotropy , quantum mechanics , magnetic field , engineering
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 (RMnO) and thickness of Mn3O4 shell (TMn3O4) 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 RMnO (TMn3O4) of the MnO@Mn3O4 core-shell NPs. The strongest exchange coupling effect of both 17.2 and 25.0 nm MnO@Mn3O4 core-shell NPs occur when RMnO=TMn3O4=R/2. It is expected that the finding of the control of exchange bias effect by varied RMnO and TMn3O4 in inverted core-shell NPs is helpful for the further understanding of the exchange bias mechanism
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