论文标题
带有顺序字段应用的域退化
Degradation of domains with sequential field application
论文作者
论文摘要
最近的实验表明，当将交替的方磁场脉冲应用于铁磁样品时，引人注目的意外特征：域显示区域还原和域壁改变了其粗糙度。我们使用模仿实验性的数字协议来用简单的标量模型来解释这些现象。对于气泡和条纹结构域，我们重现了实验发现：结构域通过线性和指数行为的结合缩小。我们还重现了实验中发现的粗糙度指数。我们的结果表明，观察到的效果是由于疾病相关长度的变化，当域壁在第一个循环中受到交替场的影响，界面的初始状态起着至关重要的作用。最后，我们的模拟通过障碍效应与局部域曲率引起的有效场之间的相互作用来解释面积损失。
Recent experiments show striking unexpected features when alternating square magnetic field pulses are applied to ferromagnetic samples: domains show area reduction and domains walls change their roughness. We explain these phenomena with a simple scalar-field model, using a numerical protocol that mimics the experimental one. For a bubble and a stripe domain, we reproduce the experimental findings: The domains shrink by a combination of linear and exponential behavior. We also reproduce the roughness exponents found in the experiments. Our results suggest that the observed effects are due to a change in the disorder correlation length when the domain walls are subject to alternating fields during the first cycles, where the initial state of the interface plays a crucial role. Finally, our simulations explain the area loss by the interplay between disorder effects and effective fields induced by the local domain curvature.
