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

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.