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Chin. Phys. B, 2016, Vol. 25(4): 047501    DOI: 10.1088/1674-1056/25/4/047501

Effects of Mg substitution on the structural and magnetic properties of Co0.5Ni0.5-xMgxFe2O4 nanoparticle ferrites

R M Rosnan, Z Othaman, R Hussin, Ali A Ati, Alireza Samavati, Shadab Dabagh, Samad Zare
Centre for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310 Skudai, Johor Bahru, Malaysia
Abstract  In this study, nanocrystalline Co-Ni-Mg ferrite powders with composition Co0.5Ni0.5-xMgxFe2O4 are successfully synthesized by the co-precipitation method. A systematic investigation on the structural, morphological and magnetic properties of un-doped and Mg-doped Co-Ni ferrite nanoparticles is carried out. The prepared samples are characterized using x-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and vibrating sample magnetometry (VSM). The XRD analyses of the synthesized samples confirm the formation of single-phase cubic spinel structures with crystallite sizes in a range of ~32 nm to ~36 nm. The lattice constant increases with increasing Mg content. FESEM images show that the synthesized samples are homogeneous with a uniformly distributed grain. The results of IR spectroscopy analysis indicate the formation of functional groups of spinel ferrite in the co-precipitation process. By increasing Mg2+ substitution, room temperature magnetic measurement shows that maximum magnetization and coercivity increase from ~57.35 emu/g to ~61.49 emu/g and ~603.26 Oe to ~684.11 Oe (1 Oe=79.5775 A·m-1), respectively. The higher values of magnetization Ms and Mr suggest that the optimum composition is Co0.5Ni0.4Mg0.1Fe2O4 that can be applied to high-density recording media and microwave devices.
Keywords:  co-precipitation      magnetic materials      spinel ferrite      magnetic properties  
Received:  01 October 2015      Revised:  16 December 2015      Accepted manuscript online: 
PACS:  75.47.Lx (Magnetic oxides)  
  75.60.-d (Domain effects, magnetization curves, and hysteresis)  
  75.75.-c (Magnetic properties of nanostructures)  
  81.20.Fw (Sol-gel processing, precipitation)  
Fund: Project supported by the Ibnu Sina Institute for Scientific and Industrial Research, Physics Department of Universiti Teknologi Malaysia and the Ministry of Education Malaysia (Grant Nos. Q.J130000.2526.04H65).
Corresponding Authors:  R M Rosnan     E-mail:

Cite this article: 

R M Rosnan, Z Othaman, R Hussin, Ali A Ati, Alireza Samavati, Shadab Dabagh, Samad Zare Effects of Mg substitution on the structural and magnetic properties of Co0.5Ni0.5-xMgxFe2O4 nanoparticle ferrites 2016 Chin. Phys. B 25 047501

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