双原子层铁纳米带初始态的磁化强度分布研究

A study of the magnetization of a bilayer ferromagnetic nanostripe in the initial state

采用磁化强度分布的正弦模型,推导无限长铁纳米带退磁能的简单表达式,结合数值计算,得到生长在W(110)表面上双原子层铁纳米带初始态磁化强度的周期和纳米带宽度的关系,结果与实验相符.由拟合磁化强度周期的实验值得到的双原子层铁纳米带的饱和磁化强度比块状铁磁材料大得多,交换常数则小得多.

With the sinusoidal model of magnetization utilized, a simple expression of demagnetizing energy of an infinitely long ferromagnetic nanostripe is derived. By combined with numerical calculations it is found that in the initial state the period of magnetization of a bilayer ferromagnetic nanostripe grown on the W（110） substrate varies with the width of the nanostripe. The results are consistent with the experiment. The saturation magnetization of the stripe fitting the experimental values of the period of magnetization is much larger than that of bulk Fe, whereas the exchange stiffness is much smaller.