We report our micromagnetic simulations based on Landau-Lifshitz-Gilbert (LLG) equation for CoFeB nanowire which was exposed by sub-nanosecond magnetic pulse with varied pulse width between 100 and 1000 ps. It is found that the Walker Breakdown field (H_WB) shifted as the field pulse duration decreased and reached at the highest value in case of 100 ps pulse width, then decreased steeply with respect to the pulse width up to 400 ps. H_WB values are not significantly dependent for pulses longer than 500 ps. It is observed that, below the H_WB, the exchange energy is larger than the demagnetization energy in the wider nanowire. By energy density analysis, it is understood that the increase of H_WB values in the cases of narrower pulse width was to compensate the energy needed to move the DW.

我们报告了基于Landau-Lifshitz-Gilbert（LLG）方程的CoFeB纳米线的微磁模拟，该纳米线被亚纳秒磁脉冲暴露，脉冲宽度在100到1000 ps之间变化。发现，在脉冲宽度为100 ps的情况下，沃克击穿磁场（H _WB）随着场脉冲持续时间的减小而减小并达到最大值，然后相对于高达400 ps的脉冲宽度急剧减小。对于超过500 ps的脉冲，H _WB值并不显着相关。观察到，在H _WB以下，交换能量大于在较宽的纳米线中的退磁能量。通过能量密度分析，可以了解到H _WB的增加 在较窄的脉冲宽度的情况下，该值可以补偿移动DW所需的能量。