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Heterogeneous dynamics and ageing in a dense ferro-glass

Abstract : Repulsive magnetic fluids show a dynamical freezing above a volume fraction Φ*, which depends on the physico-chemistry of the system. Φ* is here determined by a magneto-optical technique. The out-of-equilibrium dynamics of a glass-forming magnetic fluid (Φ = 1.2Φ*) is studied by x-ray photon correlation spectroscopy and analyzed in terms of intensity auto-correlation functions. The relaxation is age dependent and follows a compressed exponential law with a characteristic time scaling as the inverse of the scattering vector Q. The dynamical susceptibility χ is then deduced from a time resolved correlation analysis at an intermediate Q and for ages larger than 104 s.
Mots-clés : photon magnetic fluids
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Article dans une revue
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Déposant : Migration Prodinra <>
Soumis le : samedi 30 mai 2020 - 22:39:56
Dernière modification le : mardi 15 septembre 2020 - 10:50:18




E Wandersman, E Dubois, V Dupuis, Agnès Duri, A Robert, et al.. Heterogeneous dynamics and ageing in a dense ferro-glass. Journal of Physics: Condensed Matter, IOP Publishing, 2008, 20 (20), pp.204124_1 - 204124_5. ⟨10.1088/0953-8984/20/20/204124⟩. ⟨hal-02661628⟩



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