A5048126514- Magnetic properties of thin films
- Crystallography and Radiation Phenomena
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Geological and Geochemical Analysis
- Atomic and Molecular Physics
- Terahertz technology and applications
- Advanced X-ray Imaging Techniques
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Particle Accelerators and Free-Electron Lasers
- Laser-Plasma Interactions and Diagnostics
- Quantum and electron transport phenomena
- Magneto-Optical Properties and Applications
- Neural Networks and Reservoir Computing
- Material Dynamics and Properties
- Quantum optics and atomic interactions
Deutsches Elektronen-Synchrotron DESY
2021-2024
Kiel University
2024
The use of advanced X-ray sources plays a key role in the study dynamic processes magnetically ordered materials. progress free electron lasers enables direct and simultaneous observation femtosecond evolution spin systems through transient absorption spectroscopy (XAS) magnetic circular dichroism (XMCD), respectively. Such experiments allow us to resolve response seen population spin-split valence states upon optical excitation. Here, we utilize circularly polarized ultrashort soft pulses...
Time-resolved absorption spectroscopy as well magnetic circular dichroism with circularly polarized soft X-rays (XAS and XMCD) are powerful tools to probe electronic dynamics in materials element- site-selectively. Employing these methods, groundbreaking results have been obtained for instance alloys, which helped fundamentally advance the field of ultrafast magnetization dynamics. At free electron laser facility FLASH key capabilities XAS XMCD experiments recently improved: In an upgrade,...
The controlled manipulation of spins on ultrashort timescales is among the most promising solutions for novel high-speed and low-power-consumption spintronic magnetic recording applications. To do so, terahertz (THz) light pulses can be used to drive coherent magnetization dynamics in ferromagnetic thin films. We were able resolve these nanoscale employing THz-pump x-ray resonant scattering from labyrinth-type domain network a Co/Pt multilayer with perpendicular anisotropy. Our results...
The detection of inelastically scattered soft X-rays with high energy resolution usually requires large grating spectrometers. Recently, photoelectron spectrometry for analysis (PAX) has been rediscovered modern spectroscopy experiments at synchrotron light sources. By converting photons to electrons and using an electron analyser, the resonant inelastic X-ray scattering (RIXS) becomes decoupled from spot size instrument length. In this work, we develop PAX towards a photoemission setup...
We explore the impact of optical excitation using two interfering ultrashort pulses on ultrafast magnetization dynamics. Our investigation focuses Pt/Co/Pt multilayers and TbCo alloy samples, employing a dual pump approach. observe significant variations in dynamics suppression subsequent recovery when triggered with same polarization---essentially meeting conditions for interference. Conversely, cross-polarized beams exhibit expected similarity to that single pulse. Delving into underlying...
Abstract The detection of inelastically scattered soft x-rays with high energy resolution usually requires large grating spectrometers. Recently, photoelectron spectrometry for analysis (PAX) has been rediscovered modern spectroscopy experiments at synchrotron light sources. By converting photons to electrons and using an electron analyser, the resonant inelastic x-ray scattering (RIXS) becomes decoupled from spot size instrument length. In this work, we develop PAX towards a photoemission...
We explore the impact of optical excitation using two interfering ultrashort pulses on ultrafast magnetization dynamics. Our investigation focuses Pt/Co/Pt multilayers and TbCo alloy samples, employing a dual pump approach. observe significant variations in dynamics suppression subsequent recovery when triggered with same polarization-essentially meeting conditions for interference. Conversely, cross-polarized beams exhibit expected similarity to that single pulse. Delving into underlying...
Three-dimensional photon correlation spectroscopy (3D PCS) is a well-known technique developed to suppress multiple scattering contributions in functions, which are inevitably involved when an optical laser employed investigate dynamics turbid system. Here, we demonstrate proof-of-principle study of 3D PCS the hard X-ray regime. We employ cross-correlator measure silica colloidal nanoparticles dispersed polypropylene glycol. The obtained cross functions show very good agreement with...