The influences of Zn2+ and some rare-earth ions on the magnetic properties of nickel–zinc ferrites

• Published in: Journal of magnetism and magnetic materials 2004-10, Vol.281 (2-3), p.173-177
• Main Authors: Sun, Ge-Liang, Li, Jian-Bao, Sun, Jing-Jing, Yang, Xiao-Zhan
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Domain effects, magnetization curves, and hysteresis; Exact sciences and technology; Magnetic properties; Magnetic properties and materials; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Nickel–zinc ferrites; Physics; Rare earth
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2004.04.099

The influence of Zn content on the magnetic properties of Ni–Zn ferrites (Ni1−xZnxFe2O4, x=0.5∼0.7) is investigated in a wide frequency range (1M–1.8GHz). With increasing Zn content, the initial permeability (μ′) and the relative loss factor (RLF, tgδ/μ′) increase while the cut-off frequency decreases. In addition, the effects of rare earth (RE) ions on the properties of Ni0.5Zn0.5Fe1.98RE0.02O4 (RE=Y, Eu or Gd) are also investigated in the frequency range of 1M–1.8GHz. The partial substitution of Fe3+ with a small amount of RE ions increases the electrical resistivity and RLF, whereas it slightly decreases Curie temperature. Results have shown that Y and Eu substitution tend to decrease μ′ while Gd does not reduce μ′.