Studies about the attempt frequency influence on the effective relaxation time in a system of nanoparticles for magnetic hyperthermia

International Conference on Applied Sciences 2014

Cacciola, M.^1 ; Osaci, M.^2

University Mediterranea of Reggio Calabria, DICEAM, Via Graziella Feo di Vito, I-89100, Italy^1

Politehnica University of Timisoara, Department of Electrical Engineering and Industrial Informatics, 5 Revolutiei Street, Hunedoara

331128, Romania^2

关键词: Anisotropy constants;    Computational simulation;    Dipolar magnetic fields;    External magnetic field;    Magnetic dipole-dipole interaction;    Magnetic hyperthermia;    Numerical experiments;    Spherical nanoparticles;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/85/1/012021/pdf
DOI  :  10.1088/1757-899X/85/1/012021

来源: IOP

【 摘 要 】

This paper presents a series of studies about the modality in which the attempt frequency influences the Neel relaxation time and thus the effective relaxation time, in a spherical-nanoparticle-saturated nanofluid in external magnetic field. The nanoparticles have a random distribution, and their magnetic moments have a magnetic dipole-dipole interaction, along with the distributions of sizes and anisotropy constants. In such a system, the energy of the equilibrium states depends on the total magnetic field experienced by the particle, which includes the magnetic field applied and the dipolar magnetic field produced by the surrounding particles. Because of the high complexity level of the issue, it seems useful to consider the numerical experiments by computational simulation.