Probing high-frequency dynamics of a single ferromagnetic flake using a broadband micro-loop permeameter

The permeability spectra of single NiFeMo flakes have been measured within the frequency range 10 MHz–20 GHz using a high-sensitivity micro-permeameter, which we have developed. It is shown that the permeability spectrum of single flakes exhibits two resonance lines at 45 MHz and 2.8 GHz and resembl...

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Bibliographic Details
Published in:Applied physics letters 2014-04, Vol.104 (16)
Main Authors: Neige, J., Ledieu, M., Le Bihan, T., Estrade, E., Adenot-Engelvin, A.-L., Belleville, P., Vukadinovic, N.
Format: Article
Language:English
Subjects:
Applied physics
Broadband
Domain walls
Ferromagnetism
Flakes
Particulate composites
Permeability
Resonance lines
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Summary:The permeability spectra of single NiFeMo flakes have been measured within the frequency range 10 MHz–20 GHz using a high-sensitivity micro-permeameter, which we have developed. It is shown that the permeability spectrum of single flakes exhibits two resonance lines at 45 MHz and 2.8 GHz and resembles the one of flake-shaped particle composites. These two excitations exist whatever the geometrical irregularity of the flake. In addition, a comparison with the permeability spectrum of a square-shaped element suggests that the shouldering appearing in the low-frequency side of the high-frequency resonance could be attributed to domain wall resonances.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4871985