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Main Title: A tabletop setup for ultrafast helicity-dependent and element-specific absorption spectroscopy and scattering in the extreme ultraviolet spectral range
Author(s): Yao, Kelvin
Willems, Felix
Korff Schmising, Clemens von
Strüber, Christian
Hessing, Piet
Pfau, Bastian
Schick, Daniel
Engel, Dieter
Gerlinger, Kathinka
Schneider, Michael
Eisebitt, Stefan
Type: Article
Language Code: en
Abstract: Further advances in the field of ultrafast magnetization dynamics require experimental tools to measure the spin and electron dynamics with element-specificity and femtosecond temporal resolution. We present a new laboratory setup for two complementary experiments with light in the extreme ultraviolet (XUV) spectral range. One experiment is designed for polarization-dependent transient spectroscopy, particularly for simultaneous measurements of magnetic circular dichroism (MCD) at the 3p resonances of the 3d transition metals Fe, Co, and Ni. The second instrument is designed for resonant small-angle scattering experiments with monochromatic light allowing us to monitor spin dynamics with spatial information on the nanometer scale. We combine a high harmonic generation (HHG) source with a phase shifter to obtain XUV pulses with variable polarization and a flux of about (3 ± 1) × 1010 photons/s/harmonic at 60 eV at the source. A dedicated reference spectrometer effectively reduces the intensity fluctuations of the HHG spectrum to below 0.12% rms. We demonstrate the capabilities of the setup by capturing the energy- and polarization-dependent absorption of a thin Co film as well as the time-resolved small-angle scattering in a magnetic-domain network of a Co/Pt multilayer. The new laboratory setup allows systematic studies of optically induced spin and electron dynamics with element-specificity, particularly with MCD as the contrast mechanism with femtosecond temporal resolution and an unprecedented signal-to-noise ratio.
Issue Date: 23-Sep-2020
Date Available: 18-Nov-2020
DDC Class: 530 Physik
Subject(s): optical devices
nonlinear optical processes
optical properties
magnetization dynamics
magnetic circular dichroism spectroscopy
optical phase shifters
thin films
absorption spectroscopy
magnetic materials
Sponsor/Funder: DFG, 328545488, Ultraschnelle Spindynamik in heterogenen magnetischen Systemen (A02)
Journal Title: Review of Scientific Instruments
Publisher: American Institute of Physics
Publisher Place: Melville, NY
Volume: 91
Issue: 9
Article Number: 093001
Publisher DOI: 10.1063/5.0013928
EISSN: 1089-7623
ISSN: 0034-6748
Notes: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Review of Scientific Instruments 91, 093001 (2020) and may be found at
Appears in Collections:FG Röntgenoptik und Nanometer-Optik » Publications

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