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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2008

Heterogeneous dynamics and ageing in a dense ferro-glass

Résumé

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.

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Dates et versions

hal-02661628 , version 1 (30-05-2020)

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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, 2008, 20 (20), pp.204124_1 - 204124_5. ⟨10.1088/0953-8984/20/20/204124⟩. ⟨hal-02661628⟩
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