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

• Published in: Journal of magnetism and magnetic materials Vol. 368; pp. 438 - 442
• Main Author: Nakamae, Sawako
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.11.2014; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Diamagnetism, paramagnetism and superparamagnetism; Exact sciences and technology; Magnetic nanoparticles; Magnetic properties and materials; Magnetic properties of nanostructures; Out-of-equilibrium dynamics; Physics; Superspin glass; Superspin glass; Magnetic nanoparticles; Out-of-equilibrium dynamics; Ferromagnetic fluid; Spin glasses; Particle cluster; Strong interactions; Superparamagnetism; Magnetic nanomaterial; Superferromagnetism; Nanoparticles; Magnetic particles; Fluctuation dissipation theorem; Temperature effects; Particle interactions; Correlation length
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2014.05.045

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. •Recent experimental findings on superspin glass dynamics in magnetic nanoparticle systems.•Advantages of magnetic nanoparticles for the study of spin glass physics.•Open questions and future directions in superspin glass research.