Structural, magnetic, and electrical properties of sol–gel derived cobalt ferrite nanoparticles
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This work reports the synthesis and studies of semi-soft ferrimagnetic CoFe2O4 nanoparticles using sol–gel method. The X-ray diffraction patterns confirm the formation of cubic spinel CoFe2O4 nanoparticles. The average crystallite size was found from XRD data is about 30 nm. The high resolution transmission electron microscopy analysis shows that nanoparticles are highly crystalline. The magnetic properties reveal that the particles are ferrimagnetically ordered soft magnetic materials with coercive field of 620 Oe and saturation magnetization Ms = 60 emug− 1. The higher value of saturation magnetization is due to the ordered single-domains magnetic nanoparticles and lower magnitude of coercivity is attributed to the decrease of interparticle interactions and magneto-elastic anisotropy. The value of remanence ratio R < 0.5 is responsible for magnetostatic interactions of the particles. The nanoparticles possess low values of dielectric constant which decreased with increasing frequency. The low dielectric constant makes the nanoparticles as a promising candidate for high frequency magnetic devices.
The authors would like to acknowledge the Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, P. R. China to provide the facility for measuring XRD, SEM and HRTEM measurements. This work was supported by the UGC grant no. A-843-5/52/UGC/Science-10/2015. The authors are thankful to the International Science Programs (ISP), Uppsala University, Sweden and Bangladesh University of Engineering and Technology (BUET) for technical support related to magnetic and electrical properties studies.
- 3.N. Spaldin, Magnetic Materials (Cambridge University Press, Cambridge, 2003)Google Scholar
- 8.K.W. Wagner, Ann. Phys. 40, 317 (1973)Google Scholar
- 13.P. Scherrer, Göttinger Nachrichten Gesell. 2, 98 (1918)Google Scholar
- 20.A. Gatelyte, D. Jasaitis, A. Beganskiene, A. Kareiva, Mater. Sci. 17, 3 (2011)Google Scholar
- 27.M.G. Naseri, E.B. Saion, H.A. Ahangar, A.H. Shaari, M. Hashim, J. Nanomater. 2010 (2010) (article ID: 907686)Google Scholar
- 28.Z.L. Wang, Y. Liu, Z. Zhang, Materials Systems and Applications I, vol. III (Kluwer Academic, Boston, Mass, USA, 2003) (Plenum, New York)Google Scholar
- 32.M.C. Dimri, A. Verma, S.C. Kashyap, D.C. Dube, O.P. Thakur, C. Prakash, Mater. Sci. Eng. B 42, 133 (2006)Google Scholar