Frequency dispersion model of the complex permeability of soft ferrites in the microwave frequency range

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 106 to 109 H...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2022-04, Vol.105 (4), p.2725-2734
Main Authors: Barba‐Juan, Antonio, Mormeneo‐Segarra, Andrés, Vicente, Nuria, Jarque, Juan Carlos, Clausell‐Terol, Carolina
Format: Article
Language:English
Subjects:
complex magnetic permeability
Domain walls
domain‐wall motion
Ferrites
Frequency ranges
Grain size
Magnetic permeability
magnetizing mechanism
Mathematical models
Microstructure
Microwave frequencies
Ni‐Zn ferrites
Permeability
spin rotation
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Summary: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 106 to 109 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.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.18267