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

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 nontextured 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. [ABSTRACT FROM AUTHOR]