论文标题
纳米尺度上的全光开关激发并用飞秒极端紫外线进行探测
All-optical switching on the nanometer scale excited and probed with femtosecond extreme ultraviolet pulses
论文作者
论文摘要
超快控制纳米长度尺度上的磁化强度，尤其是全光开关，是将超快磁性置于数据存储技术中未来技术应用的路径上的关键。然而，由于光辐射的波长限制，磁化操纵并在此长度尺度上进行灯光范围很具有挑战性。在这里，我们通过在自由电子激光器设施Fermi的极端紫外光谱范围内的两个相干飞秒光脉冲干扰了GDFE合金中的瞬时磁性光栅，其周期性为87 nm。通过在8.3 nm的波长下调谐到GD N边缘的第三个时间延迟的脉冲衍射探测磁化模式的随后的超快演变。通过检查同时记录的第一个和第二个衍射顺序，并使用具有飞秒时间分辨率的宽视野磁光显微镜进行参考真实空间测量，我们可以最终证明在纳米长度尺度上全光速切换的超快出现。
Ultrafast control of magnetization on the nanometer length scale, in particular all-optical switching, is key to putting ultrafast magnetism on the path towards future technological application in data storage technology. However, magnetization manipulation with light on this length scale is challenging due to the wavelength limitations of optical radiation. Here, we excite transient magnetic gratings in a GdFe alloy with a periodicity of 87 nm by interference of two coherent femtosecond light pulses in the extreme ultraviolet spectral range at the free electron laser facility FERMI. The subsequent ultrafast evolution of the magnetization pattern is probed by diffraction of a third, time-delayed pulse tuned to the Gd N-edge at a wavelength of 8.3 nm. By examining the simultaneously recorded first and second diffraction orders and by performing reference real-space measurements with a wide-field magneto-optical microscope with femtosecond time resolution, we can conclusively demonstrate the ultrafast emergence of all-optical switching on the nanometer length scale.
