%0 Journal Article %T Magnetic noise of a frozen ferrofluid %+ Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes (SPHYNX) %+ Service de physique de l'état condensé (SPEC - UMR3680) %+ ITRON SAS %+ Laboratoire des Solides Irradiés (LSI) %+ Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques (PECSA) %A Komatsu, K. %A L'Hote, D. %A Nakamae, S. %A Ladieu, F. %A Mosser, V. %A Kerlain, A. %A Konczykowski, M. %A Dubois, Emeric %A Dupuis, V. %A Perzynski, R. %< avec comité de lecture %@ 0021-8979 %J Journal of Applied Physics %I American Institute of Physics %V 107 %P 09E140 %8 2010 %D 2010 %R 10.1063/1.3366613 %Z Physics [physics]Journal articles %X 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. %G English %2 https://cea.hal.science/cea-01394919/document %2 https://cea.hal.science/cea-01394919/file/201000005202.pdf %L cea-01394919 %U https://cea.hal.science/cea-01394919 %~ CEA %~ X %~ UPMC %~ ESPCI %~ CNRS %~ X-LSI %~ X-DEP %~ X-DEP-PHYS %~ PARISTECH %~ PECSA %~ INC-CNRS %~ IRAMIS-SPEC %~ PSL %~ SORBONNE-UNIVERSITE %~ ESPCI-PSL %~ SU-TI %~ IRAMIS %~ GS-PHYSIQUE %~ ALLIANCE-SU %~ TEST2-HALCNRS