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Park, Jongnam
Materials and Chemistry Lab (MCL)
Research Interests
  • Inorganic synthesis, microfluidics, nanomaterials, surface engineering, bioimaging

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Exchange bias behavior of monodisperse Fe3O4/gamma-Fe2O3 core/shell nanoparticles

Cited 11 times inthomson ciCited 8 times inthomson ci
Title
Exchange bias behavior of monodisperse Fe3O4/gamma-Fe2O3 core/shell nanoparticles
Author
Hwang, YosunAngappane, SPark, JongnamAn, KwangjinHyeon, TPark, Je-Geun
Issue Date
2012-05
Publisher
ELSEVIER SCIENCE BV
Citation
CURRENT APPLIED PHYSICS, v.12, no.3, pp.808 - 811
Abstract
We have carried out systematic studies on well-characterized monodisperse Fe3O4/gamma-Fe2O3 core/shell nanoparticles of 2-30 nm having a very narrow size distribution and possessing a uniquely mono-layer of surface gamma-Fe2O3. This unique core-shell structure, probably having a disordered magnetic surface state, leads us to three key observations of unusual magnetic properties: i) a very large magnetic exchange anisotropy reaching over 7 x 10(6) erg/cm(3) for the smaller particles, ii) exchange bias behavior in the magnetization data of the core/shell Fe3O4/gamma-Fe2O3 nanoparticles, and iii) the temperature dependence of the coercive field following an unusual exponential behavior. (C) 2011 Elsevier B.V. All rights reserved.
URI
https://scholarworks.unist.ac.kr/handle/201301/12826
URL
http://www.sciencedirect.com/science/article/pii/S1567173911005840
DOI
10.1016/j.cap.2011.11.011
ISSN
1567-1739
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ECHE_Journal Papers
BME_Journal Papers
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