The synthesis of Co sub(1-x)Dy sub(x)Fe sub(2)O sub(4) nanoparticles and thin films as well as investigating their magnetic and magneto-optical properties

• Published in: Journal of magnetism and magnetic materials 2014-01, Vol.366, p.44-49
• Main Authors: Mohammadifar, Y, Shokrollahi, H, Karimi, Z, Karimi, L
• Format: Article
• Language: English
• Subjects: Categories; Cobalt ferrites; Dysprosium; Ferrite; Magnetic properties; Magnetism; Nanoparticles; Thin films
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2014.04.017

The modification and optimization of the magnetic and magneto-optical properties of cobalt ferrite are of great importance due to their various applications in well-known scientific and industrial categories. In order to observe the effect of adding Dy super(3+) to the cobalt ferrite composition, Co sub(1-x)Dy sub(x)Fe sub(2)O sub(4) (0 < or = x < or = 0.1) ceramic nanoparticles were synthesized by the co-precipitation chemical method and then their microstructure and magnetism were investigated through x-ray diffractometry, TEM micrography, IR spectroscopy and VSM magnetometry. The polar magneto-optical Kerr effect of the thin film specimens was also studied. The results reveal that the doping of Dy super(3+) ions could effectively alter the inversion degree of the spinel structure and the following magnetic and magneto-optical features. The ferrite coercivity was enhanced by 150% after adding Dy. The perceptible shifts of peak rotations were observed in the Kerr spectra for the Dy-doped CoFe sub(2)O sub(4) films. Furthermore, T sub(c) had a descending trend with the addition of Dy from 440 [degrees]C to 420 [degrees]C for Co sub(0.05)Dy sub(0.05)Fe sub(2)O sub(4).