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Highly crystalline core-shell FeCo-CoFe2O4 nanostructures

Published online by Cambridge University Press:  27 September 2013

Brigitte Paterson ,
Parshu Gyawali ,
David McKeown ,
Andrew Buechele ,
Ian L. Pegg  and
John Philip
Brigitte Paterson
Affiliation:
Department of Physics, The Catholic University of America, Washington, DC 20064, USA The Vitreous State Laboratory, The Catholic University of America, Washington, DC 20064, USA
Parshu Gyawali
Affiliation:
The Vitreous State Laboratory, The Catholic University of America, Washington, DC 20064, USA
David McKeown
Affiliation:
The Vitreous State Laboratory, The Catholic University of America, Washington, DC 20064, USA
Andrew Buechele
Affiliation:
The Vitreous State Laboratory, The Catholic University of America, Washington, DC 20064, USA
Ian L. Pegg
Affiliation:
Department of Physics, The Catholic University of America, Washington, DC 20064, USA The Vitreous State Laboratory, The Catholic University of America, Washington, DC 20064, USA
John Philip*
Affiliation:
Department of Physics, The Catholic University of America, Washington, DC 20064, USA The Vitreous State Laboratory, The Catholic University of America, Washington, DC 20064, USA
*
a e-mail: [email protected]
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Abstract

Highly crystalline core-shell FeCo-CoFe2O4 nanowires were obtained from a three step process. Initially, CoFe2O4 nanowires were grown using electrospinning and annealing at higher temperatures. Through a thermal reduction under controlled conditions, CoFe2O4 nanostructures were converted to FeCo alloy nanowires. Then by natural oxidation, a highly crystalline shell of CoFe2O4 formed over the FeCo core structure. Structural and magnetic characterizations revealed the presence of highly crystalline FeCo-Co2FeO4 core-shell structure. Magnetically, the soft FeCo phase switches at a lower magnetic field compared to the hard CoFe2O4 phase, yielding an irregular hysteresis loop with a squeezed loop in the middle. The FeCo/CoFe2O4 core-shell is stable and it retains its structure for a prolonged duration.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 63 , Issue 3 , September 2013 , 30401
Copyright
© EDP Sciences, 2013

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