Memory in nanomagnetic systems: Superparamagnetism versus Spinglass behavior

Abstract

The slow dynamics and concomitant memory (aging) effects seen in nanomagnetic systems are analyzed on the basis of two separate paradigms : superparamagnets and spinglasses. It is argued that in a large class of aging phenomena it suffices to invoke superparamagnetic relaxation of individual single domain particles but with a distribution of their sizes. Cases in which interactions and randomness are important in view of distinctive experimental signatures, are also discussed.

11 pages and 19 figures

References in corpus (5)

• Aging and Memory Effects in Superparamagnets and Superspin Glasses
• Non-equilibrium dynamics in an interacting nanoparticle system
• Comment on "Memory Effects in an Interacting Magnetic Nanoparticle System"
• Non-equilibrium Magnetic Properties of Single Crystalline La0.7Ca0.3CoO3
• A Comment on "Memory Effects in an Interacting Magnetic Nanoparticle System"

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