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Single shot time-resolved magnetic x-ray absorption at a Free Electron Laser

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Title: Single shot time-resolved magnetic x-ray absorption at a Free Electron Laser
Authors: Jal, Emmanuelle, Makita, Mikako, Rösner, Benedikt, David, Christian, Nolting, Frithjof, Raabe, Jörg, Savchenko, Tatiana, Kleibert, Armin, Capotondi, Flavio, Pedersoli, Emanuele, Raimondi, Lorenzo, Manfredda, Michele, Nikolov, Ivaylo, Liu, Xuan, Merhe, Alaa el dine, Jaouen, Nicolas, Gorchon, Jon, Malinowski, Gregory, Hehn, Michel, Vodungbo, Boris, Lüning, Jan
Source: Phys. Rev. B 99, 144305 (2019)
Publication Year: 2018
Collection: Condensed Matter
Subject Terms: Condensed Matter - Materials Science
More Details: Ultrafast dynamics are generally investigated using stroboscopic pump-probe measurements, which characterize the sample properties for a single, specific time delay. These measurements are then repeated for a series of discrete time delays to reconstruct the overall time trace of the process. As a consequence, this approach is limited to the investigation of fully reversible phenomena. We recently introduced an off-axis zone plate based X-ray streaking technique, which overcomes this limitation by sampling the relaxation dynamics with a single femtosecond X-ray pulse streaked over a picosecond long time window. In this article we show that the X-ray absorption cross section can be employed as the contrast mechanism in this novel technique. We show that changes of the absorption cross section on the percent level can be resolved with this method. To this end we measure the ultrafast magnetization dynamics in CoDy alloy films. Investigating different chemical compositions and infrared pump fluences, we demonstrate the routine applicability of this technique. Probing in transmission the average magnetization dynamics of the entire film, our experimental findings indicate that the demagnetization time is independent of the specific infrared laser pump fluence. These results pave the way for the investigation of irreversible phenomena in a wide variety of scientific areas.
Comment: 9 pages, 5 figures
Document Type: Working Paper
DOI: 10.1103/PhysRevB.99.144305
Access URL: http://arxiv.org/abs/1811.05917
Accession Number: edsarx.1811.05917
Database: arXiv
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  Data: Ultrafast dynamics are generally investigated using stroboscopic pump-probe measurements, which characterize the sample properties for a single, specific time delay. These measurements are then repeated for a series of discrete time delays to reconstruct the overall time trace of the process. As a consequence, this approach is limited to the investigation of fully reversible phenomena. We recently introduced an off-axis zone plate based X-ray streaking technique, which overcomes this limitation by sampling the relaxation dynamics with a single femtosecond X-ray pulse streaked over a picosecond long time window. In this article we show that the X-ray absorption cross section can be employed as the contrast mechanism in this novel technique. We show that changes of the absorption cross section on the percent level can be resolved with this method. To this end we measure the ultrafast magnetization dynamics in CoDy alloy films. Investigating different chemical compositions and infrared pump fluences, we demonstrate the routine applicability of this technique. Probing in transmission the average magnetization dynamics of the entire film, our experimental findings indicate that the demagnetization time is independent of the specific infrared laser pump fluence. These results pave the way for the investigation of irreversible phenomena in a wide variety of scientific areas.<br />Comment: 9 pages, 5 figures
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