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
- 34Citations
- 32Captures
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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.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0254058412001605; http://dx.doi.org/10.1016/j.matchemphys.2012.02.007; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84862794601&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0254058412001605; https://dx.doi.org/10.1016/j.matchemphys.2012.02.007
Elsevier BV
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