高斯型非均匀应力对铁磁薄膜磁化性质的影响*

摘要

The effects of Gaussian type inhomogeneous stress and strain on the magnetic properties in ferromagnetic thin films are studied by Monte-Carlo simulation. The results show that the coercive field could be enhanced by the strain parallel to the easy axis and stress perpendicular to the easy axis, on the other hand, it could also be weakened by the stress parallel to the easy axis and strain perpendicular to the easy axis. The coercive field increases (or decreases) in the system, meanwhile, the remanent magnetization and squareness increase (or decrease) as well. More interestingly, the easy axis will rotate within the centralized region under stress parallel to the initial easy axis and strain perpendicular to the initial easy axis. The range of centralized region with easy axis rotation is strongly dependent on the magnitude of stress or strain and the width of its distribution.%　　采用Monte-Carlo方法研究了高斯型非均匀应力对的铁磁薄膜磁化性质的影响。结果表明：与易轴平行的拉应力和与易轴垂直的压应力能够增大系统的矫顽场，而与易轴平行的压应力和与易轴垂直的拉应力则会减小系统的矫顽场。在矫顽场增大(减小)的同时，系统还伴随着剩磁及其矩形度的增大(减小)。更有意义的是，在与易轴平行的压应力或与易轴垂直的拉应力作用下，在应力的集中区域会出现“易轴旋转”的现象。这种产生“易轴旋转”的应力集中区域的范围强烈地依赖于应力的强度和分布宽度。