Domain patterns of perpendicularly magnetized ultra-thin ferromagnetic films are often determined by the competition of the short range but strong exchange interaction favouring ferromagnetic alignment of magnetic moments and the long range but weak antiferromagnetic dipolar interaction. Detailed phase diagrams of the resulting stripe domain patterns have been evaluated in recent years; however, the domain fluctuations in these pattern forming systems have not been studied in great detail so far. Here we show that domain fluctuations can be observed in ultra-thin two-dimensional ferromagnetic Fe/Ni/Cu(001) films with perpendicular magnetization in the stripe domain phase. Non-stroboscopic time-resolved threshold photoemission electron microscopy with high temporal resolution allows analysing the dynamic fingerprint of the topological excitations in the nematic domain phase. Furthermore, proliferation of domain ending defects in the vicinity of the spin reorientation transition is witnessed.
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机译：垂直磁化的超薄铁磁膜的畴图案通常由短距离但强交换相互作用的竞争决定，这有利于磁矩的铁磁排列，而长距离但反铁磁偶极相互作用较弱。近年来，已评估了所产生的条带域模式的详细相图。但是，到目前为止，尚未对这些图案形成系统中的区域波动进行详细研究。在这里，我们表明在带磁畴相中具有垂直磁化强度的超薄二维铁磁Fe / Ni / Cu（001）薄膜中可以观察到磁畴波动。具有高时间分辨率的非频闪时间分辨阈值光发射电子显微镜可以分析向列域相中拓扑激发的动态指纹。此外，在自旋重新取向转变附近观察到域末端缺陷的扩散。
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