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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
R. Kumar, M. Kar 
Corresponding Authors:
Manoranjan Kar 
DOI #:
http://dx.doi.org/10.1016/j.jmmm.2016.05.035 
Title:
Lattice strain induced magnetism in substituted nanocrystalline cobalt ferrite 
Journal:
Journal of Magnetism and Magnetic Materials 
Year:
2016 
Volume:
416 
Page:
335 
Keywords:
Spinel, Ferrite, Magnetic anisotropy, XRD, Rietveld, Crystal structure 
Abstract:
Strontium (Sr) substituted cobalt ferrite i.e. Co1-xSrxFe2O4 (x=0.00, 0.01, 0.015, 0.02, 0.05, 0.1) have been synthesized by the citric acid modified sol-gel method.Crystal structure and phase purity have been studied by the X-ray powder diffraction technique. The Rietveld refinement of XRD pattern using the space groupFd m3 shows monotonically increasing of lattice parameter with the increase in Sr concentration. 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. Magnetocystalline anisotropy constant were calculated by employing the Law of Approach (LA) to the saturation. It is observed that magnetocrystalline anisotropy has anomaly for x=0.01 (Co0.99Sr0.01Fe2O4) sample. Strain mediated modification of magnetic properties in Sr substituted cobalt ferrite has been observed. The saturation magnetization for doping concentration i.e. x=0.01 abruptly increase while for x>0.01 decreases with the increase in Sr concentration. A correlation between lattice strain and magnetic behaviour in non-magnetic Sr- substituted nano-crystalline cobalt ferrite has been reported. 
Entered by:
Venkata Dantham on 2020-08-02 
 
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