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An experimental and theoretical study of the optical, electronic, and magnetic properties of novel inverted α-Cr2O3@α-Mn0.35Cr1.65O2.94 core shell nanoparticles

Published online by Cambridge University Press:  05 January 2017

Mohammad D. Hossain ,
Robert A. Mayanovic ,
Ridwan Sakidja  and
Mourad Benamara
Mohammad D. Hossain
Affiliation:
Department of Physics, Astronomy & Materials Science, Missouri State University, Springfield, MO 65897
Robert A. Mayanovic*
Affiliation:
Department of Physics, Astronomy & Materials Science, Missouri State University, Springfield, MO 65897
Ridwan Sakidja
Affiliation:
Department of Physics, Astronomy & Materials Science, Missouri State University, Springfield, MO 65897
Mourad Benamara
Affiliation:
University of Arkansas Nano-Bio Materials Characterization Facility, University of Arkansas, Fayeteville, AR 72701
*
a) Address all correspondence to this author. e-mail: robertmayanovic@missouristate.edu
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Abstract

Magnetic core–shell nanoparticles (CSNs) have potential applications in spintronic devices, drug delivery systems, and magnetic random access memory. By use of our hydrothermal nano-phase epitaxy method, we have accomplished synthesis of novel, well-ordered α-Cr2O3@α-Mn0.35Cr1.65O2.94 inverted CSNs. XRD and TEM analyses show a core–shell structure with corundum phase throughout the core and shell with a minimal amount of interface defects. TEM-EDX and XPS data show Mn having the +2 oxidation state in the shell of the CSNs. Magnetization measurements at 5 K show a weak coercivity (H C) value of 8 Oe and an exchange bias field (H E) of 293 Oe. Ab initio calculations show that Mn incorporation in α-Cr2O3 results in narrowing of the energy band gap, substantiated by UV–Vis measurements, and half metallic behavior in case of Mn(III) substitution. Our calculations substantiate that Mn substitution in α-Cr2O3 results in a combination of antiferromagnetic and weak ferrimagnetic character of our CSNs.

Keywords

core/shellmagnetic propertiesnanostructure
Type
Invited Papers
Information
Journal of Materials Research , Volume 32 , Issue 2 , 27 January 2017 , pp. 269 - 278
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Copyright
Copyright © Materials Research Society 2017 

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References

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