铁纳米线磁行为的微磁学模拟与研究  

STUDY ON MAGNETIC PROPERTIES OF Fe-NANOWIRES BY MICROMAGNETIC SIMULATION

作　　者：肖君军[1] 孙超[1] 薛德胜[1] 李发伸[1] 

机构地区：[1]兰州大学教育部磁学与磁性材料重点实验室,兰州730000

出　　处：《物理学报》2001年第8期1605-1609,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号 :19835 0 5 0 );中国科学院兰州化学物理研究所固体润滑国家重点实验室访问学者专项基金(批准号 :980 8)资助

摘　　要：通过微磁学模拟的手段对用电化学沉积法制备出的呈圆柱形的铁纳米线在常温下的磁行为进行了系统的研究 ,结果表明不同形状参量的铁纳米线都表现出磁各向异性 ,矫顽力随纳米线直径变化近似呈现平方反比关系 ,而对每一固定的直径 ,矫顽力随纳米线长度的增加而增大 ,最后趋向定值 .磁滞回线形状、静态磁矩分布和反转机制等都随纳米线的直径和长度的变化而变化 ,对相应的规律给出了明确的解释 .模拟结果显示实验上尚不能制备出的直径为 5nm的纳米线呈现一致反转机理 。Systematic study on magnetic properties of Fe-nanowires fabricated by electrochemical deposition is performed by micromagnetic simulation, which reveals that all nanowires show magnetic anisotropy, and the coercivity dependents on the diameter with a relationship of inverse square ratio. With fixed diameter, it increases as the length increases, stopping at a platform. The hysteresiss loop, static magnetic configuration and reversal mechanism all vary with changing diameter and length of the wires. Explicit explanation is presented based on the details of the magnetization process. Nanowires with diameter of 5nm, which have not been successfully acquired by experiments all show uniform reverse mechanism in the simulation. Even more intriguing magnetic behaviors emerge when the shape of the wires becomes more particle-like.

关 键 词：铁纳米线 微磁学 磁行为 模拟 磁性纳米材料 

分 类 号：O482.5[理学—固体物理]