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Frequency dispersion model of the complex permeability of soft ferrites in the microwave frequency range
Author(s) -
BarbaJuan Antonio,
MormeneoSegarra Andrés,
Vicente Nuria,
Jarque Juan Carlos,
ClausellTerol Carolina
Publication year - 2022
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.18267
Subject(s) - microstructure , permeability (electromagnetism) , materials science , grain size , relative permeability , crystallite , microwave , nickel , composite material , nuclear magnetic resonance , condensed matter physics , porosity , chemistry , metallurgy , physics , membrane , biochemistry , quantum mechanics
The complex permeability of Cu‐doped nickel‐zinc polycrystalline ferrites is strongly dependent on microstructure, particularly, on relative density ( ϕ $\phi $ ) and average grain size ( G $G$ ). In this study, a mathematical model, able to fit the measured magnetic permeability spectra from 10 6 to 10 9 Hz, is proposed and validated for a width range of average grain sizes (3.40–23.15 μm) and relative densities (0.83–0.96). To the authors’ knowledge, domain‐wall motion and spin rotation contributions to magnetic permeability have been integrated jointly with the microstructure for the first time in the proposed model, highlighting the relative influence of each magnetizing mechanism and microstructure on the magnetic permeability at different angular frequencies.