What is it about?
Iron loss and permeability spectrum are key properties of soft magnetic materials. We confirmed that both exhibit Cole-Cole type relaxation behavior in the reversible process. Using DC permeability, relaxation frequency, and the peak value of the imaginary part of permeability, we formulated their characteristics. Additionally, our analysis predicted a change in magnetization behavior around 100 kHz, which was verified through domain observations.
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Why is it important?
We focused on the relationship between iron loss and the permeability spectrum and applied the analysis method used for the permittivity of dielectric materials, known as the "Cole-Cole plot," to magnetic permeability. This approach enables a quantitative treatment of the frequency dependence of permeability, which had previously been analyzed qualitatively.
Perspectives
The physical mechanism of AC magnetization behavior in soft magnetic materials, including iron loss characteristics, has not yet been fully elucidated. We hope that this study will contribute to the advancement of this field.
Yuya Tomita
Daido steel Co. Ltd.,
Read the Original
This page is a summary of: Analysis of iron loss and complex permeability spectra for transverse-field-annealed Fe-based nanocrystalline core, AIP Advances, March 2025, American Institute of Physics,
DOI: 10.1063/9.0000892.
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