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Tuneable magnetic properties of hydrothermally synthesised core/shell CoFe2O4/NiFe2O4 and NiFe2O4/CoFe2O4 nanoparticles

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Abstract

Core/shell hetero-nanostructures of hydrothermally synthesised cobalt and nickel ferrites are shown to exhibit novel magnetic properties. The compositions and phase distributions of homogeneous Co0.5Ni0.5Fe2O4, and core/shell NiFe2O4-Core/CoFe2O4-Shell and CoFe2O4-Core/NiFe2O4-Shell nanoparticles (NPs) are confirmed using high-resolution transmission electron microscopy and electron energy loss spectroscopy. SQUID magnetometry investigations demonstrate that, at room temperature, homogeneous Co0.5Ni0.5Fe2O4 NPs (~8 nm in diameter) are in the super-paramagnetic state, the magnetisation of NiFe2O4-Core/CoFe2O4-Shell NPs (~11 nm in diameter) is partially blocked, whilst CoFe2O4-Core/NiFe2O4-Shell NPs (~11 nm in diameter) are in a blocked state. In particular, NiFe2O4-Core/CoFe2O4-Shell NPs exhibit twice the out-of-phase χ″ susceptibility of CoFe2O4-Core/NiFe2O4-Shell NPs, being dominated by the magnetisation of the core ferrite phase. Hence, when exposed to a high-frequency magnetic field, it is considered that the high χ″ susceptibility of NiFe2O4-Core/CoFe2O4-Shell NPs will promote large magnetically induced heating effects, making these core/shell NPs strong candidates for hyperthermia applications.

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Acknowledgment

The authors would like to thank the Engineering and Physical Science research Council for financial support.

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  1. Trevor P. Almeida

    Present address: Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK

Authors and Affiliations

  1. Division of Materials, Mechanics and Structures, Department of Mechanical, Materials and Manufacturing Engineering, Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK

    Trevor P. Almeida & Paul D. Brown

  2. School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK

    Fabrizio Moro

  3. Nottingham Nanotechnology and Nanoscience Centre, University of Nottingham, University Park, Nottingham, NG7 2RD, UK

    Michael W. Fay

  4. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Streatham Campus, Northcote House, Exeter, EX4 4QJ, UK

    Yanqiu Zhu

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  1. Trevor P. Almeida
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Correspondence to Trevor P. Almeida or Fabrizio Moro.

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Almeida, T.P., Moro, F., Fay, M.W. et al. Tuneable magnetic properties of hydrothermally synthesised core/shell CoFe2O4/NiFe2O4 and NiFe2O4/CoFe2O4 nanoparticles. J Nanopart Res 16, 2395 (2014). https://doi.org/10.1007/s11051-014-2395-1

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