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Heterogeneous dynamics and ageing in a dense ferro-glass

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Wandersman, E | Dubois, E | Dupuis, V | Duri, Agnès | Robert, A | Perzynski, R

Edité par CCSD ; IOP Publishing [1989-....] -

International audience. 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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