Fe纳米线阵列宏观磁性的Preisach模拟

Preisach simulation on magnetic properties of Fe nanowire array

采用阳极氧化铝模板法制备16 nm的铁纳米线阵列膜,并研究了其宏观磁学性质．沿着纳米线长轴加场测得的磁滞回线表现出高的矫顽力和矩形比,归因于垂直于膜面的高形状各向异性．等温剩磁曲线和直流退磁曲线的测量结果表明纳米线阵列体系中存在强烈的退磁性相互作用．采用Preisach模型对相关曲线进行模拟,发现剩磁矫顽力和相互作用场的分布较窄,是一种典型的符合双势垒模型的体系．

Fe nanowire array with diameter of 16 nm was fabricated into anodic aluminum oxide templates, and its magnetic properties was studied. Magnetic hysteresis loop measured along the long axis of nanowires shows a strong coercivity and high remnant magnetization, which are ascribed to large shape anisotropy along nanowires. Isothermal remnant magnetization （IRM） curve and direct current demagnetization （DCD） curve indicate strong demagnetizing interaction in the nanowire array system. We simulated the magnetization curves with the Preisach model, and remnant coercive force and interaction field show relative narrow distributions, which agree well with the double-well potential model.