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  Physics Express 2013, 3: 21
  Research Article
Comparative studies on magnetocrystalline anisotropy constant of CoFe1.5M0.5O4, M=Al & Cr
  Lawrence Kumara,b, Pawan Kumara, Manoranjan Kara  
a Department of Physics, Indian Institute of Technology Patna, Patna-800013, India
b Centre for Nanotechnology, Central University of Jharkhand, Ranchi-835205, India

  Nanocrystalline CoFe1.5Al0.5O4 and CoFe1.5Cr0.5O4 have been synthesized by the standard citrate precursor method. Crystal structure and phase purity have been studied by X-ray powder diffraction method. All the XRD Patterns have been analyzed by Rietveld refinement technique using the Fd3m space group. Magnetic hysteresis loops measurement has been carried out at room temperature using a vibrating sample magnetometer (VSM) over a field range of ± 1.5 T. It has been observed that the saturation magnetisation, remanant magnetisation and magnetocrystalline anisotropy constants are larger in Cr substituted sample than that of Al substituted one irrespective of the particle size (almost same for both samples). The magnetic data in high field region have been analyzed by employing law of approach to saturation (LA) technique. The anisotropy constants have been obtained from the LA analysis and found to be dependent upon crystal structure parameters, crystallite sizes, bond lengths and bond angles. The coercivity is lower in Cr substituted sample than that of Al substituted one.
  Spinel; Ferrite; Magnetic anisotropy; XRD; Rietveld  

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