铁磁纳米阵列膜温度稳定性的损伤扩散研究

利用损伤扩散方法研究了三角点阵量子磁盘的温度稳定性问题.为建立实际体系的伊辛模型，我们作了三方面考虑：1)计入自旋间的长程相互作用；2)考虑纳米线阵列中纳米线长度的不一致性，3)推导出矫顽力与自旋交换常数间的关系并利用矫顽力定量估算出自旋交换常数的数值.模拟结果表明，自旋间的作用范围越长，损伤扩散越难，即稳定性越好；而纳米线的长度混乱度越大，温度稳定性越差. 关键词： 量子磁盘 温度稳定性 损伤扩散方法

Research on the temperature stability of triangular ferromagnetic nanowire arrays using the damage spreading method

The temperature stability of the quantum magnetic disk constructed on a triangular manowire array is studied by the damage spreading method. Three aspects are considered in order to make the Ising model more realistic. Firstly, we include the long-range interaction between spins. Secondly, we take into account the disorder of the nanowire lengths. At last, we present an estimation of the spin interaction constant through the system coercive force by deriving the relation between the spin interaction constant and the coercive force. It is shown that the longer the spin interaction acts, the more stable the system becomes. On the other hand, the system has greater temperature instability when the disorder degree of the nanowire lengths is increased.