Memory in a magnetic nanoparticle system: Polydispersity and interaction effects

S. Chakraverty, M. Bandyopadhyay, S. Chatterjee, S. Dattagupta, A. Frydman, S. Sengupta, P. A. Sreeram

Research output: Contribution to journalArticlepeer-review

72 Scopus citations


We report here a theory of relaxation of single domain magnetic nanoparticles, appropriate for analyzing measurements of Mössbauer spectra, magnetization response, and hysteretic coercivity. Our special focus of attention in the theoretical formulation is the presence of dipolar interaction between the magnetic particles. We discuss in detail the effect of interaction as well as particle size distribution on the measured relaxation spectra and irreversible, nonequilibrium magnetization response in field-cooled and zero-field-cooled situations. Some of the memory effects, similar to those seen in spin glass systems, may be put to important device applications by tuning the interaction and the particle size.

Original languageEnglish
Article number054401
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number5
StatePublished - Feb 2005


Dive into the research topics of 'Memory in a magnetic nanoparticle system: Polydispersity and interaction effects'. Together they form a unique fingerprint.

Cite this