Gerlinger Kathinka, Pfau Bastian, Hennecke Martin, Kern Lisa-Marie, Will Ingo, Noll Tino, Weigand Markus, Gräfe Joachim, Träger Nick, Schneider Michael, Günther Christian M, Engel Dieter, Schütz Gisela, Eisebitt Stefan
Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, 12489 Berlin, Germany.
Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin, Germany.
Struct Dyn. 2023 Mar 21;10(2):024301. doi: 10.1063/4.0000167. eCollection 2023 Mar.
We present time-resolved scanning x-ray microscopy measurements with picosecond photo-excitation via a tailored infrared pump laser at a scanning transmission x-ray microscope. Specifically, we image the laser-induced demagnetization and remagnetization of thin ferrimagnetic GdFe films proceeding on a few nanoseconds timescale. Controlling the heat load on the sample via additional reflector and heatsink layers allows us to conduct destruction-free measurements at a repetition rate of 50 MHz. Near-field enhancement of the photo-excitation and controlled annealing effects lead to laterally heterogeneous magnetization dynamics which we trace with 30 nm spatial resolution. Our work opens new opportunities to study photo-induced dynamics on the nanometer scale, with access to picosecond to nanosecond time scales, which is of technological relevance, especially in the field of magnetism.
我们展示了在扫描透射X射线显微镜下，通过定制的红外泵浦激光进行皮秒光激发的时间分辨扫描X射线显微镜测量。具体而言，我们对薄亚铁磁性GdFe薄膜在几纳秒时间尺度上的激光诱导退磁和再磁化进行成像。通过额外的反射层和散热层控制样品上的热负载，使我们能够以50 MHz的重复频率进行无损测量。光激发的近场增强和可控退火效应导致横向不均匀的磁化动力学，我们以30 nm的空间分辨率对其进行追踪。我们的工作为研究纳米尺度上的光诱导动力学开辟了新机会，可实现皮秒到纳秒的时间尺度，这在技术上具有相关性，特别是在磁性领域。
