Single-shot Monitoring of Ultrafast Processes via X-ray Streaking at a Free Electron Laser

被引：10

作者：

Buzzi, Michele ^{[1
]}

Makita, Mikako ^{[1
]}

Howald, Ludovic ^{[1
]}

Kleibert, Armin ^{[1
]}

Vodungbo, Boris ^{[2
,3
]}

Maldonado, Pablo ^{[4
]}

Raabe, Jorg ^{[1
]}

Jaouen, Nicolas ^{[5
]}

Redlin, Harald ^{[6
]}

Tiedtke, Kai ^{[6
]}

Oppeneer, Peter M. ^{[4
]}

David, Christian ^{[1
]}

Nolting, Frithjof ^{[1
]}

Luning, Jan ^{[3
,5
]}

机构：

[1] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[2] Ecole Polytech, CNRS, UMR 7639, Lab Opt Appl,ENSTA ParisTech, Chemin Huniere, F-91761 Palaiseau, France

[3] UPMC Univ Paris 06, Sorbonne Univ, CNRS, LCPMR, F-75005 Paris, France

[4] Uppsala Univ, Dept Phys & Astron, SE-75120 Uppsala, Sweden

[5] Synchrotron SOLEIL, BP 48, F-91192 Gif Sur Yvette, France

[6] DESY, HASYLAB, Notkestr 85, D-22607 Hamburg, Germany

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

基金：

瑞典研究理事会;

关键词：

DEMAGNETIZATION; MULTILAYERS; DYNAMICS;

D O I：

10.1038/s41598-017-07069-z

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The advent of x-ray free electron lasers has extended the unique capabilities of resonant x-ray spectroscopy techniques to ultrafast time scales. Here, we report on a novel experimental method that allows retrieving with a single x-ray pulse the time evolution of an ultrafast process, not only at a few discrete time delays, but continuously over an extended time window. We used a single x-ray pulse to resolve the laser-induced ultrafast demagnetisation dynamics in a thin cobalt film over a time window of about 1.6 ps with an excellent signal to noise ratio. From one representative single shot measurement we extract a spin relaxation time of (130 +/- 30) fs with an average value, based on 193 single shot events of (113 +/- 20) fs. These results are limited by the achieved experimental time resolution of 120 fs, and both values are in excellent agreement with previous results and theoretical modelling. More generally, this new experimental approach to ultrafast x-ray spectroscopy paves the way to the study of non-repetitive processes that cannot be investigated using traditional repetitive pump-probe schemes.

引用

页数：8

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