Observation of superspin glass state in magnetically textured ferrofluid (γ-Fe2O3)

Sawako Nakamae (1) , Youssef Tahri (1) , Caroline Thibierge (1) , Denis L'Hôte (1) , Eric Vincent (1) , Vincent Dupuis (2) , Emmanuelle Dubois (2) , Régine Perzynski (2)

1 SPEC - UMR3680 - Service de physique de l'état condensé
2 LI2C - Liquides Ioniques et Interfaces Chargées

Magnetic properties in a magnetically textured ferrofluid made out of interacting maghemite (γ-Fe2O3) nanoparticles suspended in glycerin have been investigated. Despite the loss of uniform distribution of anisotropy axes, a superspin glass state exists at low temperature in a concentrated, textured ferrofluid as in the case of its non-textured counterpart. The onset of superspin glass state was verified from the sample's AC susceptibility. The influence of the anisotropy axis orientation on the aging behavior in the glassy states is also discussed.

Keywords: superspin glass out-of-equilibrium dynamics ferrofluid

Domains: Other [cond-mat.other]

Sawako Nakamae, Youssef Tahri, Caroline Thibierge, Denis L'Hôte, Eric Vincent, et al.. Observation of superspin glass state in magnetically textured ferrofluid (γ-Fe2O3). 53rd Conference on Magnetism and Magnetic Materials, Nov 2008, Austin, United States. pp.07E318, ⟨10.1063/1.3072383⟩. ⟨hal-00348801v2⟩