Out-of-equilibrium dynamics in superspin glass state of strongly interacting magnetic nanoparticle assemblies

Sawako Nakamae (1)

1 SPHYNX - Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes

Interacting magnetic nanoparticles display a wide variety of magnetic behaviors ranging from modified superparamagnetism, superspin glass to possibly, superferromagnetism. The superspin glass state is described by its slow and out-of-equilibrium magnetic behaviors akin to those found in atomic spin glasses. In this article, recent experimental findings on superspin correlation length growth and the violation of the fluctuation-dissipation theorem obtained in concentrated frozen ferrofluids are presented to illustrate certain out-of-equilibrium dynamics behavior in superspin glasses.

Mots clés: Magnetic nanoparticles; Superspin glass; Out-of-equilibrium dynamics

Domaines: Physique [physics]

Sawako Nakamae. Out-of-equilibrium dynamics in superspin glass state of strongly interacting magnetic nanoparticle assemblies. Journal of Magnetism and Magnetic Materials, 2014, 355, pp.225 - 229. ⟨10.1016/j.jmmm.2013.12.018⟩. ⟨cea-01384258⟩