磁纳米线阵列交换偏置研究  

Study on exchange bias in magnetic nanowire arrays

作　　者：郭子政[1] 

机构地区：[1]华南农业大学理学院应用物理系,广东广州510642

出　　处：《磁性材料及器件》2013年第2期13-16,33,共5页Journal of Magnetic Materials and Devices

基　　金：广东省高等学校人才引进专项资金资助项目;华南农业大学校长科学基金资助项目

摘　　要：讨论了磁纳米线阵列中静磁相互作用导致的交换偏置问题。采用伊辛模型并利用蒙特卡洛方法比较了三角点阵纳米线阵列上不同反转比下的静磁相互作用能和形状各向异性能的大小。根据斯通纳-沃尔法斯模型,交换偏置场主要来自偶极相互作用场。计算表明,交换偏置场随反转比增大相比最大值下降很快。纳米线长度涨落对体系的交换偏置影响很小。分析了实验中对实际纳米线阵列观察不到明显交换偏置现象的原因。The problem of whether the magnetostatic interaction will result in the exchange bias phenomenon in magnetic nanowire arrays is studied. The strength comparison of the magnetostatic interaction and the shape anisotropy is made by using Ising model and Monte Carlo method for triangular lattices with various spin flipping ratios. According to the Stoner-Wotfforth model, the exchange bias field comes from the dipole interaction field. Calculations show that the exchange bias field decreases greatly compared to the maximum value as the flipping ratio increases. The calculations also show that the effects of nanowire length fluctuation on the exchange bias of the system are small. The explanation for why there is no obvious exchange bias phenomenon in actual nanowire arrays is proposed.

关 键 词：磁纳米线阵列 静磁相互作用 形状各向异性 交换偏置 

分 类 号：O482.5[理学—固体物理] TB383[理学—物理]