Broadband Permeability Spectra of Flake-Shaped Ferromagnetic Particle Composites

Broadband permeability spectra of aligned ferromagnetic flakes embedded in a nonmagnetic polymer matrix have been measured using an APC-7 coaxial line within the frequency range 10 MHz-18 GHz. These spectra reveal two well-defined resonance lines. The low-frequency one (sub-GHz range) has previously...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2017-11, Vol.53 (11), p.1-4
Main Authors: Raolison, Z., Clement, Q., Adenot-Engelvin, A.-L, Mallejac, N., Lefevre, C., Pourroy, G., Boust, F., Vukadinovic, N.
Format: Article
Language:English
Subjects:
Analytical models
Anisotropic magnetic composite
Broadband
Electromagnetism
Engineering Sciences
ferromagnetic flake
Ferromagnetism
Flakes
Magnetic cores
Magnetic permeability
Magnetic resonance
Magnetic resonance imaging
Magnetic structure
Magnetism
Mathematical models
microwave permeability
Particle spin
Particulate composites
Permeability
Perpendicular magnetic anisotropy
Resonance lines
Resonant frequency
Spin dynamics
Spin resonance
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Summary:Broadband permeability spectra of aligned ferromagnetic flakes embedded in a nonmagnetic polymer matrix have been measured using an APC-7 coaxial line within the frequency range 10 MHz-18 GHz. These spectra reveal two well-defined resonance lines. The low-frequency one (sub-GHz range) has previously been attributed to the fundamental vortex translation mode in a multidomain magnetic structure, whereas the high-frequency resonance (beyond 1 GHz) is assigned to the natural spin resonance. A two-level analytical model combining a spin dynamics description including these two contributions at the flake scale and a Maxwell-Garnett mixing rule at the composite scale has been developed and reproduces very satisfactorily the experimental spectra in terms of resonance frequencies, resonance linewidths, and resonance mode amplitudes.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2017.2735943