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Effect of temperature on the magnetic characteristics of Ni 0.5 Co 0.5 Fe 2 O 4 nanoparticles

Materials Chemistry and Physics, ISSN: 0254-0584, Vol: 133, Issue: 2, Page: 1006-1010
2012
  • 34
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  • 32
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Metrics Details

  • Citations
    34
    • Citation Indexes
      34
  • Captures
    32

Article Description

Magnetic nanoparticles of Ni 0.5 Co 0.5 Fe 2 O 4 (size: 18 ± 3 nm) have been synthesized by chemical co-precipitation route. Coercivity ( H C ) of the particles shows an increasing behavior with decreasing temperature and observes deviation from the Kneller's law for ferromagnetic nanostructures. Exchange bias effect ( H ex ) shows an exponential increase with decreasing temperatures followed by a sharp fall below ∼5 K. The saturation magnetization ( M s ) follows modified Bloch's law in the high temperature range (100–300 K), while below 100 K it shows a decreasing trend with decreasing temperature followed by slow increase in M s at very low temperatures. Blocking behavior shows a decreasing trend in blocking temperature ( T b ) of the system as the applied field in M ( T ) measurements is increased. The results have been discussed in terms of the variation of anisotropy with temperature, modified spin-wave theory predictions, interparticle interactions, and the presence of spin glass (SG) like phase at the surface of Ni 0.5 Co 0.5 Fe 2 O 4 nanoparticles.

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