二维磁场激励下磁纳米粒子磁化谐波信息分布  

Harmonic distribution of magnetic nanoparticles magnetization under 2D applied magnetic field

作　　者：杜中州 王丹丹 孙毅 崔艳英 DU Zhongzhou;WANG Dandan;SUN Yi;CUI Yanying(School of Computer and Communication Engineering,Zhengzhou University of Light Industry,Zhengzhou 450001,China)

机构地区：[1]郑州轻工业大学计算机与通信工程学院,河南郑州450001

出　　处：《华中科技大学学报（自然科学版）》2021年第6期19-25,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金青年基金资助项目(61803346);国家自然科学基金面上项目(61773018);河南省科技攻关项目(192102310213)。

摘　　要：提出了二维磁场激励下磁纳米粒子(MNPs)的谐波分布模型,分析了特征参数对磁化响应谐波分布的影响.首先,基于郎之万顺磁定理构建了二维磁场激励下的MNPs非线性磁化响应谐波分布模型;然后系统研究了平行/垂直磁场激励下的磁化响应谐波信息分布特征,以及MNPs物理特征参数和系统参数对谐波信息分布的影响.结果表明:二维磁场激励下,x轴和y轴上的磁化响应奇次谐波和偶次谐波自然分离,直流磁场对磁化谐波幅值具有调控作用,且存在最值点,可为磁纳米温度计中的高精度谐波提取和优化设计提供依据.In this study, a model for magnetization harmonics distribution of magnetic nanoparticles(MNPs) under two dimensional(2D) excitation magnetic fields was proposed, and the impact of characteristic parameters on the magnetization harmonics distribution was analyzed. The harmonics distribution model for nonlinear magnetization of MNPs was firstly constructed based on Langevin equation under 2D excitation magnetic fields.Then,the characteristics of magnetization harmonics distribution under parallel/vertical excitation magnetic fields and the effects of MNPs physical parameters and system parameters on magnetization harmonics distribution were systematically investigated. The simulation results indicate that the odd and even harmonics of magnetization on x-axis and y-axis are naturally separated.Moreover,the direct current excitation magnetic field can regulate the amplitude of magnetization harmonics, and there are extreme points. It is expected to provide a basis for highprecision extraction of magnetization harmonics and optimization design of the magnetic nanoparticles thermometer.

关 键 词：肿瘤热疗 二维激励磁场 磁纳米粒子 朗之万顺磁定理 谐波幅值分布 

分 类 号：TH811[机械工程—仪器科学与技术] TP23[机械工程—精密仪器及机械]