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Evidence of an embedded vortex translation mode in flake-shaped ferromagnetic particle composites

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6 Author(s)
Neige, J. ; CEA-DAM Le Ripault, 37260 Monts, France ; Lepetit, T. ; Mallejac, N. ; Adenot-Engelvin, A.-L.
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A low-frequency resonance (sub-GHz) is observed in microwave permeability spectra of anisotropic flake-shaped ferromagnetic particle composites. The resonance frequency of this peak increases linearly with the saturation magnetization of flakes, their aspect ratio, and the amplitude of a perpendicular static magnetic field. In addition, this resonance becomes extinct for a perpendicular RF exciting magnetic field. These experimental features are reproduced by an analytical model of vortex dynamics which militates in favor of an assignment of this low-frequency signal as an embedded vortex translation mode within a multidomain magnetic structure.

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Applied Physics Letters  (Volume:102 ,  Issue: 24 )