论文标题
超快速爆发后瞬态域壁的出现
Emergence of Transient Domain Wall Skyrmions after Ultrafast Demagnetisation
论文作者
论文摘要
众所周知，超快激光脉冲可用于确定性地切换磁化并创建天空，但是在超快爆发后，单个NéelSkyrmion的确定性创建仍然是一个空旷的问题。在这里，我们显示了域壁天空在暴露于超快激光脉冲后，具有倒置对称性的系统中也出现，并带有整数拓扑电荷。尽管由于Arrhenius定律，由于快速的热衰变而没有出现域壁天空，但它们通过与相反拓扑充电的灭绝的灭绝来控制最终的天际群体，并在Poisson分布后产生Skyrmion状态。使用单形的线性极化激光脉冲以及一系列循环极化激光脉冲，我们表明，当产生高度的混乱程度时，将单个NéelSkyrmion成核的可能性会伴随着将Skyrmion与域壁上的Skyrmion Skyrmion Skyyrmion对成核的可能性。
It is known that ultrafast laser pulses can be used to deterministically switch magnetisation and create skyrmions, however the deterministic creation of a single Néel skyrmion after ultrafast demagnetisation remains an open question. Here we show domain wall skyrmions also emerge in systems with broken inversion symmetry after exposure to an ultrafast laser pulse, carrying an integer topological charge. Whilst domain wall skyrmions do not appear in the relaxed state due to quick thermal decay following an Arrhenius law, they play a key role in controlling the final skyrmion population through annihilations with skyrmions of opposite topological charge, with the resultant skyrmion states following a Poisson distribution. Using single-shot linearly polarised laser pulses, as well as a train of circularly polarised laser pulses, we show that when a high degree of disorder is created, the possibility of nucleating a single Néel skyrmion is accompanied by the possibility of nucleating a skyrmion with domain wall skyrmion pair, which results in a self-annihilation collapse.
