Magnetic noise of a frozen ferrofluid

K. Komatsu 1 D. l'Hote 1, 2 S. Nakamae 1 F. Ladieu 1, 2 V. Mosser 3 A. Kerlain 3 M. Konczykowski 4 E. Dubois 5 V. Dupuis 5 R. Perzynski 5
1 SPHYNX - Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
2 SPEC - UMR3680 - Service de physique de l'état condensé
3 ITRON SAS
4 LSI - Laboratoire des Solides Irradiés
5 PECSA - Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques
Abstract : The magnetic noise of a frozen ferrofluid made of maghemite nanoparticles dispersed in glycerin is measured using a two-dimensional electron gas based quantum well Hall sensor QWHS with the spinning current technique. The frozen ferrofluid shows a superspin glass transition at 67 K. Below this glass transition temperature, the relation between the imaginary part of the ac susceptibility of a bulk ferrofluid sample and the magnetic noise measured with the QWHS gives an indication of a violation of the fluctuation dissipation theorem.
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K. Komatsu, D. l'Hote, S. Nakamae, F. Ladieu, V. Mosser, et al.. Magnetic noise of a frozen ferrofluid. Journal of Applied Physics, American Institute of Physics, 2010, 107, pp.09E140. ⟨10.1063/1.3366613⟩. ⟨cea-01394919⟩

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