J. Lüning
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View article: Near- and mid-infrared excitation of ultrafast demagnetization in a cobalt multilayer system
Near- and mid-infrared excitation of ultrafast demagnetization in a cobalt multilayer system Open
International audience
View article: Electron Population Dynamics in Resonant Non-Linear X-ray Absorption in Nickel at a Free-Electron Laser
Electron Population Dynamics in Resonant Non-Linear X-ray Absorption in Nickel at a Free-Electron Laser Open
Free-electron lasers provide bright, ultrashort, and monochromatic X-ray pulses, enabling novel spectroscopic mea-surements not only with femtosecond temporal resolution: The high fluence of their X-ray pulses can also easily enterthe regi…
View article: Ultrafast magnetic scattering on ferrimagnets enabled by a bright Yb-based soft x-ray source
Ultrafast magnetic scattering on ferrimagnets enabled by a bright Yb-based soft x-ray source Open
Development of ultrafast table-top x-ray sources that can map various spin, orbital, and electronic configurations and reordering processes on their natural time and length scales is an essential topic for modern condensed matter physics a…
View article: Investigating Coherent Magnetization Control with Ultrashort THz Pulses
Investigating Coherent Magnetization Control with Ultrashort THz Pulses Open
Coherent terahertz control of magnetization dynamics is an area of current interest due to its great potential for the realization of magnetization control on ultrafast timescales in commercial devices. Here we report on an experiment real…
View article: Raman Red‐Shift Compressor: A Simple Approach for Scaling the High Harmonic Generation Cut‐Off
Raman Red‐Shift Compressor: A Simple Approach for Scaling the High Harmonic Generation Cut‐Off Open
The use of ultrashort laser pulses with long wavelengths as drivers is a relevant strategy for scaling high harmonic generation (HHG) to higher photon energies. Here, stimulated Raman scattering enhanced by the formation of multidimensiona…
View article: Time-Resolved XUV Absorption Spectroscopy and Magnetic Circular Dichroism at the Ni M2,3-Edges
Time-Resolved XUV Absorption Spectroscopy and Magnetic Circular Dichroism at the Ni M2,3-Edges Open
Ultrashort optical pulses can trigger a variety of non-equilibrium processes in magnetic thin films affecting electrons and spins on femtosecond timescales. In order to probe the charge and magnetic degrees of freedom simultaneously, we de…
View article: Element-Specific Magnetization Dynamics of Complex Magnetic Systems Probed by Ultrafast Magneto-Optical Spectroscopy
Element-Specific Magnetization Dynamics of Complex Magnetic Systems Probed by Ultrafast Magneto-Optical Spectroscopy Open
The vision to manipulate and control magnetism with light is driven on the one hand by fundamental questions of direct and indirect photon-spin interactions, and on the other hand by the necessity to cope with ever growing data volumes, re…
View article: Ultrafast Demagnetization Dominates Fluence Dependence of Magnetic Scattering at Co <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>M</mml:mi></mml:math> Edges
Ultrafast Demagnetization Dominates Fluence Dependence of Magnetic Scattering at Co Edges Open
We systematically study the fluence dependence of the resonant scattering cross-section from magnetic domains in Co/Pd-based multilayers. Samples are probed with single extreme ultraviolet (XUV) pulses of femtosecond duration tuned to the …
View article: Simultaneous two-color snapshot view on ultrafast charge and spin dynamics in a Fe-Cu-Ni tri-layer
Simultaneous two-color snapshot view on ultrafast charge and spin dynamics in a Fe-Cu-Ni tri-layer Open
Ultrafast phenomena on a femtosecond timescale are commonly examined by pump-probe experiments. This implies multiple measurements, where the sample under investigation is pumped with a short light pulse and then probed with a second pulse…
View article: Transient magnetic gratings on the nanometer scale
Transient magnetic gratings on the nanometer scale Open
Laser-driven non-local electron dynamics in ultrathin magnetic samples on a sub-10 nm length scale is a key process in ultrafast magnetism. However, the experimental access has been challenging due to the nanoscopic and femtosecond nature …
View article: Simultaneous two-color snapshot view on ultrafast charge and spin dynamics in a Fe-Cu-Ni tri-layer
Simultaneous two-color snapshot view on ultrafast charge and spin dynamics in a Fe-Cu-Ni tri-layer Open
Ultrafast phenomena on a femtosecond timescale are commonly examined by pump-probe experiments. This implies multiple measurements where the sample under investigation is pumped with a short light pulse and has to be probed with a second p…
View article: Wavelength scaling of ultrafast demagnetization in Co/Pt multilayers
Wavelength scaling of ultrafast demagnetization in Co/Pt multilayers Open
International audience
View article: Time-resolving magnetic scattering on rare-earth ferrimagnets with a bright soft-X-ray high-harmonic source
Time-resolving magnetic scattering on rare-earth ferrimagnets with a bright soft-X-ray high-harmonic source Open
We demonstrate the first time-resolved X-ray resonant magnetic scattering (tr-XRMS) experiment at the N edge of Tb at 155 eV performed using a tabletop high-brightness high-harmonic generation (HHG) source. In contrast to static X-ray imag…
View article: Resonant Faraday effect using high-order harmonics for the investigation of ultrafast demagnetization
Resonant Faraday effect using high-order harmonics for the investigation of ultrafast demagnetization Open
International audience
View article: Continuous magnetic phase transition in artificial square ice
Continuous magnetic phase transition in artificial square ice Open
Critical behavior is very common in many fields of science and a wide variety\nof many-body systems exhibit emergent critical phenomena. The beauty of\ncritical phase transitions lies in their scale-free properties, such that the\ntemperat…
View article: Continuous magnetic phase transition in artificial square ice
Continuous magnetic phase transition in artificial square ice Open
Open access data set for manuscript "Continuous magnetic phase transition in artificial square ice" published in Physical Review B, 99, 214430 (2019)
View article: Continuous magnetic phase transition in artificial square ice
Continuous magnetic phase transition in artificial square ice Open
Open access data set for manuscript "Continuous magnetic phase transition in artificial square ice" published in Physical Review B, 99, 214430 (2019)
View article: Single-shot time-resolved magnetic x-ray absorption at a free-electron laser
Single-shot time-resolved magnetic x-ray absorption at a free-electron laser Open
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…
View article: Measurements of ultrafast spin-profiles and spin-diffusion properties in the domain wall area at a metal/ferromagnetic film interface
Measurements of ultrafast spin-profiles and spin-diffusion properties in the domain wall area at a metal/ferromagnetic film interface Open
Exciting a ferromagnetic material with an ultrashort IR laser pulse is known to induce spin dynamics by heating the spin system and by ultrafast spin diffusion processes. Here, we report on measurements of spin-profiles and spin diffusion …
View article: Multi-Color Imaging of Magnetic Co/Pt Multilayers
Multi-Color Imaging of Magnetic Co/Pt Multilayers Open
International audience
View article: Structural dynamics during laser-induced ultrafast demagnetization
Structural dynamics during laser-induced ultrafast demagnetization Open
The mechanism underlying femtosecond laser pulse induced ultrafast\nmagnetization dynamics remains elusive despite two decades of intense research\non this phenomenon. Most experiments focused so far on characterizing\nmagnetization and ch…
View article: Multi-color imaging of magnetic Co/Pt heterostructures
Multi-color imaging of magnetic Co/Pt heterostructures Open
We present an element specific and spatially resolved view of magnetic domains in Co/Pt heterostructures in the extreme ultraviolet spectral range. Resonant small-angle scattering and coherent imaging with Fourier-transform holography reve…
View article: Magnetic diffuse scattering in artificial kagome spin ice
Magnetic diffuse scattering in artificial kagome spin ice Open
The study of magnetic correlations in dipolar-coupled nanomagnet systems with synchrotron x-ray scattering provides a means to uncover emergent phenomena and exotic phases, in particular in systems with thermally active magnetic moments. F…