Equilibrium and dynamic behaviour of (weakly) interacting assemblies of magnetic nanoparticles

8th International Conference on Fine Particle Magnetism

Vernay, F.^1 ; Sabsabi, Z.^1 ; Iglesias, O.^2 ; Kachkachi, H.^1

Laboratoire PROMES-CNRS UPR 8521, Université de Perpignan Via Domitia, Rambla de la thermodynamique - Tecnosud, 66100 Perpignan, France^1

Department de Fisica Fonamental, Institut de Nanociencia i Nanotecnologia, Universitat de Barcelona, Av. Diagonal 647, Spain^2

关键词: Dynamic behaviours;    Ferromagnetic nanoparticles;    Inter-particle interaction;    Magnetic nano-particles;    Optimal magnetic properties;    Physical parameters;    Semi-analytical approaches;    Spatial arrangements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/521/1/012010/pdf
DOI  :  10.1088/1742-6596/521/1/012010

来源: IOP

【 摘 要 】

A still open issue related with the study of assemblies of magnetic nanoparticles, deposited on a substrate or embedded in a matrix, is that of the interplay between intrinsic features of the nanoparticles pertaining to their finite-size and boundary effects, and the collective effects entailed by their mutual interactions and their interactions with the hosting matrix or substrate. In this work we develop a semi-analytical approach that allows us to derive expressions for the magnetization and the susceptibility of interacting assemblies of single-domain ferromagnetic nanoparticles. We find that upon tuning the physical parameters pertaining to each nanoparticle or the shape of the assembly and its spatial arrangement, surface and inter-particle interactions may be set up to play additive or comptetive roles leading to assemblies with optimal magnetic properties.