缺损钴纳米环磁特性模拟研究

Simulation Study of Magnetic Properties for Defect Co Nanorings

利用蒙特卡洛(MC)方法结合快速傅立叶变换微磁学(FFTM)方法,研究了缺损钴纳米环材料的磁特性,模拟结果表明:缺损钴纳米环的磁滞回线依然存在典型的双稳态特征.当缺损纳米环中的内半径变化时,在外磁场的作用下依然存在着洋葱态和涡旋态,但在外磁场变化过程中出现了多次局部涡旋的过渡状态,随着缺损程度的变化,其磁化行为也发生变化.

Base on the Monte Carlo simulation and fast Fourier transformation micro-magnetism method, the magnetic properties of Co nanorings with different defect are studied. The simulation results show that bistable state can be observed in Co nanoring with different defect degree. The sys- tems still exist ＂vortex＂ state and ＂onion＂ state when we change the inside radius, and more transi- tion state can be observed in the system. The magnetization behavior changes with changing defect degree of nanoring.