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Please use this identifier to cite or link to this item: http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/3250
Title: The magnetic proximity effect in a ferrimagnetic Fe3O4 core/ferrimagnetic γ-Mn2O3 shell nanoparticle system
Authors: Basu, Mrinmoyee
Keywords: Chemistry
Magnetic proximity
Ferrimagnetic Fe3O4 core/ferrimagnetic
Issue Date: 2011
Publisher: IOP
Abstract: We report the magnetic proximity effect in a ferrimagnetic Fe3O4 core/ferrimagnetic γ-Mn2O3 shell nanoparticle system, in terms of an enhancement of the Curie temperature (Tc) of the γ-Mn2O3 shell (∼66 K) compared to its bulk value (∼40 K), and the presence of magnetic ordering in its so-called paramagnetic region (i.e. above 66 K). The ferrimagnetic nature of both core and shell has been found from a neutron diffraction study. The origin of these two features of the magnetic proximity effect has been ascribed to the proximity of the γ-Mn2O3 shell with a high-Tc Fe3O4 core (∼858 K in bulk form) and an interface exchange coupling between core and shell. Interestingly, we did not observe any exchange bias effect, which has been interpreted as a signature of a weak interface exchange coupling between core and shell. The present study brings out the importance of the relative strength of the interface coupling in governing the simultaneous occurrence of the magnetic proximity effect and the exchange bias phenomenon in a single system.
URI: https://iopscience.iop.org/article/10.1088/0953-8984/23/50/506004
http://dspace.bits-pilani.ac.in:8080/xmlui/handle/123456789/3250
Appears in Collections:Department of Chemistry

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