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 language | English |
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Article number | 2272577 |
Journal | IEEE Transactions on Magnetics |
Volume | 50 |
Issue number | 1 |
DOIs | |
State | Published - Jan 2014 |
Externally published | Yes |
Keywords
- Co doping
- Complex permeability
- Nickel ferrite
- Relaxation
- Resonance