Novel frequency dispersion of permeability in nickel ferrites with different amounts of cobalt doping

Zhihong Yang, Zhengwen Li, Yanhui Yang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The effect of cobalt doping on permeability spectra of nickel ferrites with excess iron (Ni0.743-xMn0.057CoxFe 2.20O4, x = 0-0.027) has been studied. With increasing amounts of Co-doping, the static permeability μi decreases at first, then increases to the local maximum at Co substitution of x = 0.018, and finally decreases again. The permeability spectra go through a modification of relaxation-resonance-relaxation dispersions. The samples with Co substitution of x = 0.018 and 0.021 have the static permeability of ∼13, resonance frequency of 400 MHz, and sufficiently low magnetic loss tangents, over 1-250 MHz, make them promising candidates for high frequency applications.

Original languageEnglish
Article number2272577
JournalIEEE Transactions on Magnetics
Volume50
Issue number1
DOIs
StatePublished - Jan 2014
Externally publishedYes

Keywords

  • Co doping
  • Complex permeability
  • Nickel ferrite
  • Relaxation
  • Resonance

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