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.
出处
《磁性材料及器件》
CAS
北大核心
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
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
magnetic nanowire array
magnetostatic interaction
shape anisotropy
exchange bias
