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

  • Trevor P. AlmeidaEmail author
  • Fabrizio MoroEmail author
  • Michael W. Fay
  • Yanqiu Zhu
  • Paul D. Brown
Research Paper


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.


Hydrothermal synthesis Spinel ferrites Core/shell nanoparticles Magnetic properties 



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

Supplementary material

11051_2014_2395_MOESM1_ESM.pdf (800 kb)
Supplementary material 1 (PDF 800 kb)


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Division of Materials, Mechanics and Structures, Department of Mechanical, Materials and Manufacturing Engineering, Faculty of EngineeringUniversity of NottinghamNottinghamUK
  2. 2.Department of Earth Science and EngineeringImperial College LondonLondonUK
  3. 3.School of ChemistryUniversity of NottinghamNottinghamUK
  4. 4.Nottingham Nanotechnology and Nanoscience CentreUniversity of NottinghamNottinghamUK
  5. 5.College of Engineering, Mathematics and Physical SciencesUniversity of ExeterExeterUK

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