尺寸和空间分布对电沉积Co纳米线矫顽力的影响  

The Size and Space Arrangement Roles on Coercivity of Electrodeposited Co Nanowires

作　　者：张志城[1] 程宝华[1] 钟克华[1] 吴青云[1] 刘美梅[1] 黄志高[1] 

机构地区：[1]福建师范大学物理与光电信息科技学院,福建福州350007

出　　处：《福建师范大学学报（自然科学版）》2007年第1期46-49,共4页Journal of Fujian Normal University：Natural Science Edition

基　　金：福建省自然科学基金资助项目(A0510013);福建师范大学2004-2005学年"本科课外科技计划"立项项目(BKL2005-004)

摘　　要：研究了室温下不同直径的Co纳米线在不同取向下的磁化行为.实验结果表明:不同直径Co纳米线的矫顽力随着纳米线与外加磁场之间角度θ的增大而减小.理论上,应用蒙特卡罗模拟研究了纳米线矫顽力对角度θ的依赖关系.对比理论和实验的结果,得到如下结论:磁晶各向异性对Co纳米线磁特性起着重大的影响,Co纳米线的磁化反转过程不能简单地用球链模型中经典的一致转动模型来解释.Magnetization curves with various magnetic field orientations and nanowire diameters were measured at room temperature. The measured coercivity as a function of angle θ between the field and wire axis reveals that the coercivity decreases with increasing the value of θ for various nanowires. Theoretically, based on Monte Carlo simulation, we investigated the magnetization reversal modes of the Co nanowires and obtained also the θ dependence of coercivity. Comparing the simulated with the experimental results, it is found find that the magnetocrystalline anisotropy plays an important role on the magnetic properties of Co nanowires, and the magnetization reversal process in the Co nanowires could not be understood by the classi cal uniform rotation mode in the chain-of-sphere model.

关 键 词：阳极氧化铝模板 磁化反转模型 纳米线 矫顽力 蒙特卡罗模拟 磁晶各向异性 一致转动 

分 类 号：O482.5[理学—固体物理]