Magnetic interactions in an ensemble of cubic nanoparticles: A Monte Carlo study

Woińska M. , J. Szczytko , A. Majhofer , Jacek Gosk , A. Twardowski


The ensemble of spatially disordered and randomly oriented spherical monodispersed single-domain magnetic nanoparticles with cubic anisotropy was studied by the Monte Carlo method. In the presence of dipole-dipole interactions, the effect of both particle volume and interparticle separation was investigated with respect to the characteristic parameters of hysteresis loops and zero field cooled and field cooled magnetization curves. The coercive field and remanent magnetic moment were shown to depend strongly on the dimensionless parameter β=kBT/(K1V) (T temperature, V particle volume, K1 cubic anisotropy constant). It was revealed that strong dipole-dipole interactions suppress both the coercive field and the remanent magnetic moment of densely packed nanoparticles. Yet, the effect quickly diminishes with the increasing interparticle distances and becomes rather insignificant for separations exceeding three particle diameters. The blocking temperature was found to be weakly affected by dipolar interactions, but mainly governed via β, i.e., by the nanoparticle volume and the strength of crystalline anisotropy. The role of dipole-dipole interactions on magnetic properties of nanoparticles was further elucidated by a comparison of the simulation results for a single cluster with an infinite periodic arrangement of such clusters. © 2013 American Physical Society.
Author Woińska M.
Woińska M.,,
, J. Szczytko
J. Szczytko,,
, A. Majhofer
A. Majhofer,,
, Jacek Gosk (FP / SRD) - [University of Warsaw (UW)]
Jacek Gosk,,
- Structural Research Division
- Uniwersytet Warszawski
, A. Twardowski
A. Twardowski,,
Journal seriesPhysical Review B, ISSN 1098-0121
Issue year2013
ASJC Classification3104 Condensed Matter Physics; 2504 Electronic, Optical and Magnetic Materials
Score (nominal)35
Score sourcejournalList
ScoreMinisterial score = 35.0, 10-06-2020, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 10-06-2020, ArticleFromJournal
Publication indicators Scopus Citations = 26; Scopus SNIP (Source Normalised Impact per Paper): 2013 = 1.326; WoS Impact Factor: 2013 = 3.664 (2) - 2013=3.564 (5)
Citation count*4 (2015-04-09)
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