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Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 2011

Dynamics of paramagnetic nanostructured rods under rotating field

Résumé

The dynamical rotational behavior of magnetic nanostructured rods based on the auto-association of maghemite nanoparticles and block-copolymers is probed by optical microscopy under rotating fields i n a s imple l iquid. The reorientation of the rods by a field rotated by 90° is first studied. The measured relaxation is characteristic of param-agnetic objects. Under a stationnary rotating field, a synchronous rotational regime is observed at low field frequency. Above a frequency threshold which scales as H^2 , the dynamics becomes asynchronous with back-and-forth rotations. These behaviors are well predicted by the presented model.
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Dates et versions

hal-02678291 , version 1 (31-05-2020)

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Bruno Frka-Petesic, Kaspars Erglis, Jean-Francois Berret, Andrejs Cebers, Vincent Dupuis, et al.. Dynamics of paramagnetic nanostructured rods under rotating field. Journal of Magnetism and Magnetic Materials, 2011, 323 (10), pp.1309-1313. ⟨10.1016/j.jmmm.2010.11.036⟩. ⟨hal-02678291⟩
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