Effect of nonlinear superparamagnetic response on susceptibility curves for nanoparticle assemblies - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2013

Effect of nonlinear superparamagnetic response on susceptibility curves for nanoparticle assemblies

Résumé

We examine the effect of the applied magnetic field amplitude on zero field-cooled/field-cooled (ZFC/FC) curves, through the nonlinear susceptibility of superparamagnetic particles (i.e., at thermondynamic equilibrium, but taking into account the magnetic anisotropy). This nonlinear effect is shown to be the first to manifest itself when going away from the linear response regime (i.e., when the magnetic moment is simply proportional to the applied field), largely before the modification of the macrospin switching energy due to the external field. We demonstrate that it has a significant impact on ZFC/FC curves, especially for the low-temperature behavior of the FC curve, even in usual experimental conditions. We then show how this nonlinearity can be taken into account, in an easy way, to obtain a better modeling of the susceptibility curves and consequently a more reliable determination of the nanoparticles’ magnetic properties. The theoretical considerations are confronted in a series of experimental measurements on Co nanoparticles.
Fichier principal
Vignette du fichier
Tournus_nonlinear_ZFC_FC_PhysRevB.87.174404.pdf (298.34 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03048691 , version 1 (15-02-2021)

Identifiants

Citer

Florent Tournus, Arnaud Hillion, Alexandre Tamion, Véronique Dupuis. Effect of nonlinear superparamagnetic response on susceptibility curves for nanoparticle assemblies. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 87 (17), pp.174404. ⟨10.1103/PhysRevB.87.174404⟩. ⟨hal-03048691⟩
17 Consultations
66 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More