TY - JOUR
T1 - Memory in a magnetic nanoparticle system
T2 - Polydispersity and interaction effects
AU - Chakraverty, S.
AU - Bandyopadhyay, M.
AU - Chatterjee, S.
AU - Dattagupta, S.
AU - Frydman, A.
AU - Sengupta, S.
AU - Sreeram, P. A.
PY - 2005/2
Y1 - 2005/2
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=15744398915&partnerID=8YFLogxK
U2 - 10.1103/physrevb.71.054401
DO - 10.1103/physrevb.71.054401
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:15744398915
SN - 1098-0121
VL - 71
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 5
M1 - 054401
ER -