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244 results on '"Carley, Robert"'

3. The Heisenberg-RIXS instrument at the European XFEL

Author

Schlappa, Justine, Ghiringhelli, Giacomo, Van Kuiken, Benjamin E., Teichmann, Martin, Miedema, Piter S., Delitz, Jan Torben, Gerasimova, Natalia, Molodtsov, Serguei, Adriano, Luigi, Baranasic, Bernard, Broers, Carsten, Carley, Robert, Gessler, Patrick, Ghodrati, Nahid, Hickin, David, Hoang, Le Phuong, Izquierdo, Manuel, Mercadier, Laurent, Mercurio, Giuseppe, Parchenko, Sergii, Stupar, Marijan, Yin, Zhong, Martinelli, Leonardo, Merzoni, Giacomo, Peng, Ying Ying, Reuss, Torben, Lalithambika, Sreeju Sreekantan Nair, Techert, Simone, Laarmann, Tim, Huotari, Simo, Schroeter, Christian, Langer, Burkhard, Giessel, Tatjana, Buechner, Robby, Buchheim, Jana, da Cruz, Vinicius Vaz, Eckert, Sebastian, Gwalt, Grzegorz, Liu, Chun-Yu, Siewert, Frank, Sohrt, Christian, Weniger, Christian, Pietzsch, Annette, Neppl, Stefan, Senf, Friedmar, Scherz, Andreas, and Föhlisch, Alexander

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Resonant Inelastic X-ray Scattering (RIXS) is an ideal X-ray spectroscopy method to push the combination of energy and time resolutions to the Fourier transform ultimate limit, because it is unaffected by the core-hole lifetime energy broadening. And in pump-probe experiments the interaction time is made very short by the same core-hole lifetime. RIXS is very photon hungry so it takes great advantage from high repetition rate pulsed X-ray sources like the European XFEL. The hRIXS instrument is designed for RIXS experiments in the soft X-ray range with energy resolution approaching the Fourier and the Heisenberg limits. It is based on a spherical grating with variable line spacing (VLS) and a position-sensitive 2D detector. Initially, two gratings are installed to adequately cover the whole photon energy range. With optimized spot size on the sample and small pixel detector the energy resolution can be better than 40 meV at any photon energy below 1000 eV. At the SCS instrument of the European XFEL the spectrometer can be easily positioned thanks to air-pads on a high-quality floor, allowing the scattering angle to be continuously adjusted over the 65-145 deg range. It can be coupled to two different sample interaction chamber, one for liquid jets and one for solids, each equipped at the state-of-the-art and compatible for optical laser pumping in collinear geometry. The measured performances, in terms of energy resolution and count rate on the detector, closely match design expectations. hRIXS is open to public users since the summer of 2022., Comment: 43 pages, 12 figures, Supplemental Material

Published
2024

4. Transient absorption of warm dense matter created by an X-ray free-electron laser

Author

Mercadier, Laurent, Benediktovitch, Andrei, Krušič, Špela, Kas, Joshua J., Schlappa, Justine, Agåker, Marcus, Carley, Robert, Fazio, Giuseppe, Gerasimova, Natalia, Kim, Young Yong, Le Guyader, Loïc, Mercurio, Giuseppe, Parchenko, Sergii, Rehr, John J., Rubensson, Jan-Erik, Serkez, Svitozar, Stransky, Michal, Teichmann, Martin, Yin, Zhong, Žitnik, Matjaž, Scherz, Andreas, Ziaja, Beata, and Rohringer, Nina

Published
2024
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5. Femtosecond spin-state switching dynamics of spin-crossover molecules condensed in thin films

Author

Kämmerer, Lea, Kämmerer, Gérald, Gruber, Manuel, Grunwald, Jan, Lojewski, Tobias, Mercadier, Laurent, Guyader, Loïc Le, Carley, Robert, Carinan, Cammille, Gerasimova, Natalia, Hickin, David, Van Kuiken, Benjamin E., Mercurio, Giuseppe, Teichmann, Martin, Kuppusamy, Senthil Kumar, Scherz, Andreas, Ruben, Mario, Sokolowski-Tinten, Klaus, Eschenlohr, Andrea, Ollefs, Katharina, Schmitz-Antoniak, Carolin, Tuczek, Felix, Kratzer, Peter, Bovensiepen, Uwe, and Wende, Heiko

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science, Physics - Chemical Physics
Abstract

The photoinduced switching of Fe(II)-based spin-crossover complexes from singlet to quintet takes place at ultrafast time scales. This a priori spin-forbidden transition triggered numerous time-resolved experiments of solvated samples to elucidate the mechanism at play. The involved intermediate states remain uncertain. We apply ultrafast x-ray spectroscopy in molecular films as a method sensitive to spin, electronic, and nuclear degrees of freedom. Combining the progress in molecule synthesis and film growth with the opportunities at x-ray free-electron lasers, we analyze the transient evolution of the Fe L3 fine structure at room temperature. Our measurements and calculations indicate the involvement of an Fe triplet intermediate state. The high-spin state saturates at half of the available molecules, limited by molecule-molecule interaction within the film.

Published
2023

6. Photo-induced charge-transfer renormalization in NiO

Author

Lojewski, Tobias, Golez, Denis, Ollefs, Katharina, Guyader, Loïc Le, Kämmerer, Lea, Rothenbach, Nico, Engel, Robin Y., Miedema, Piter S., Beye, Martin, Chiuzbăian, Gheorghe S., Carley, Robert, Gort, Rafael, Van Kuiken, Benjamin E., Mercurio, Giuseppe, Schlappa, Justina, Yaroslavtsev, Alexander, Scherz, Andreas, Döring, Florian, David, Christian, Wende, Heiko, Bovensiepen, Uwe, Eckstein, Martin, Werner, Philipp, and Eschenlohr, Andrea

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Photo-doped states in strongly correlated charge transfer insulators are characterized by $d$-$d$ and $d$-$p$ interactions and the resulting intertwined dynamics of charge excitations and local multiplets. Here we use femtosecond x-ray absorption spectroscopy in combination with dynamical mean-field theory to disentangle these contributions in NiO. Upon resonant optical excitation across the charge transfer gap, the Ni $L_3$ and O $K$ absorption edges red-shift for $>10$ ps, associated with photo-induced changes in the screening environment. An additional signature below the Ni $L_3$ edge is identified for $<1$ ps, reflecting a transient nonthermal population of local many-body multiplets. We employ a nonthermal generalization of the multiplet ligand field theory to show that the feature originates from $d$-$d$ transitions. Overall, the photo-doped state differs significantly from a chemically doped state. Our results demonstrate the ability to reveal excitation pathways in correlated materials by x-ray spectroscopies, which is relevant for ultrafast materials design.

Published
2023

7. Transient non-collinear magnetic state for all-optical magnetization switching

Author

Parchenko, Sergii, Frej, Antoni, Ueda, Hiroki, Carley, Robert, Mercadier, Laurent, Gerasimova, Natalia, Mercurio, Giuseppe, Schlappa, Justine, Yaroslavtsev, Alexander, Agarwal, Naman, Gort, Rafael, Scherz, Andreas, Zvezdin, Anatoly, Stupakiewicz, Andrzej, and Staub, Urs

Subjects
Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons, Physics - Optics
Abstract

Resonant absorption of a photon by bound electrons in a solid can promote an electron to another orbital state or transfer it to a neighboring atomic site. Such a transition in a magnetically ordered material could affect the magnetic order. While this process is an obvious road map for optical control of magnetization, experimental demonstration of such a process remains challenging. Exciting a significant fraction of magnetic ions requires a very intense incoming light beam, as orbital resonances are often weak compared to above-band-gap excitations. In the latter case, a sizeable reduction of the magnetization occurs as the absorbed energy increases the spin temperature, masking the non-thermal optical effects. Here, using ultrafast x-ray spectroscopy, we were able to resolve changes in the magnetization state induced by resonant absorption of infrared photons in Co-doped yttrium iron garnet, with negligible thermal effects. We found that the optical excitation of the Co ions affects the two distinct magnetic Fe sublattices differently, resulting in a transient non-collinear magnetic state. The present results indicate that the all-optical magnetization switching most likely occurs due to the creation of a transient, non-collinear magnetic state followed by coherent spin rotations of the Fe moments.

Published
2023
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8. Electron Dynamics at High-Energy Densities in Nickel from Non-linear Resonant X-ray Absorption Spectra

Author

Engel, Robin Y., Alexander, Oliver, Atak, Kaan, Bovensiepen, Uwe, Buck, Jens, Carley, Robert, Cascella, Michele, Chardonnet, Valentin, Chiuzbaian, Gheorghe Sorin, David, Christian, Döring, Florian, Eschenlohr, Andrea, Gerasimova, Natalia, de Groot, Frank, Guyader, Loïc Le, Humphries, Oliver S., Izquierdo, Manuel, Jal, Emmanuelle, Kubec, Adam, Laarmann, Tim, Lambert, Charles-Henri, Lüning, Jan, Marangos, Jonathan P., Mercadier, Laurent, Mercurio, Giuseppe, Miedema, Piter S., Ollefs, Katharina, Pfau, Bastian, Rösner, Benedikt, Rossnagel, Kai, Rothenbach, Nico, Scherz, Andreas, Schlappa, Justine, Scholz, Markus, Schunck, Jan O., Setoodehnia, Kiana, Stamm, Christian, Techert, Simone, Vinko, Sam M., Wende, Heiko, Yaroslavtsev, Alexander A., Yin, Zhong, and Beye, Martin

Subjects
Condensed Matter - Materials Science
Abstract

The pulse intensity from X-ray free-electron lasers (FELs) can create extreme excitation densities in solids, entering the regime of non-linear X-ray-matter interactions. We show L3-edge absorption spectra of metallic nickel thin films with fluences entering a regime where several X-ray photons are incident per absorption cross-section. Main features of the observed non-linear spectral changes are described with a predictive rate model for electron population dynamics during the pulse, utilizing a fixed density of states and tabulated ground-state properties., Comment: The main text contains 5 pages and 4 figures, the total length including supplement is 14 pages, 7 figures and one table. See also the simultaneously submitted paper about the rate model

Published
2022
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9. Photon shot-noise limited transient absorption soft X-ray spectroscopy at the European XFEL

Author

Guyader, Loïc Le, Eschenlohr, Andrea, Beye, Martin, Schlotter, William, Döring, Florian, Carinan, Cammille, Hickin, David, Agarwal, Naman, Boeglin, Christine, Bovensiepen, Uwe, Buck, Jens, Carley, Robert, Castoldi, Andrea, D'Elia, Alessandro, Delitz, Jan-Torben, Ehsan, Wajid, Engel, Robin, Erdinger, Florian, Fangohr, Hans, Fischer, Peter, Fiorini, Carlo, Föhlisch, Alexander, Gelisio, Luca, Gensch, Michael, Gerasimova, Natalia, Gort, Rafael, Hansen, Karsten, Hauf, Steffen, Izquierdo, Manuel, Jal, Emmanuelle, Kamil, Ebad, Karabekyan, Suren, Kluyver, Thomas, Laarmann, Tim, Lojewski, Tobias, Lomidze, David, Maffessanti, Stefano, Mamyrbayev, Talgat, Marcelli, Augusto, Mercadier, Laurent, Mercurio, Giuseppe, Miedema, Piter S., Ollefs, Katharina, Rossnagel, Kai, Rösner, Benedikt, Rothenbach, Nico, Samartsev, Andrey, Schlappa, Justine, Setoodehnia, Kiana, Chiuzbaian, Gheorghe Sorin, Spieker, Lea, Stamm, Christian, Stellato, Francesco, Techert, Simone, Teichmann, Martin, Turcato, Monica, Van Kuiken, Benjamin, Wende, Heiko, Yaroslavtsev, Alexander, Zhu, Jun, Molodtsov, Serguei, David, Christian, Porro, Matteo, and Scherz, Andreas

Subjects
Physics - Instrumentation and Detectors, Condensed Matter - Strongly Correlated Electrons
Abstract

Femtosecond transient soft X-ray Absorption Spectroscopy (XAS) is a very promising technique that can be employed at X-ray Free Electron Lasers (FELs) to investigate out-of-equilibrium dynamics for material and energy research. Here we present a dedicated setup for soft X-rays available at the Spectroscopy & Coherent Scattering (SCS) instrument at the European X-ray Free Electron Laser (EuXFEL). It consists of a beam-splitting off-axis zone plate (BOZ) used in transmission to create three copies of the incoming beam, which are used to measure the transmitted intensity through the excited and unexcited sample, as well as to monitor the incoming intensity. Since these three intensity signals are detected shot-by-shot and simultaneously, this setup allows normalized shot-by-shot analysis of the transmission. For photon detection, the DSSC imaging detector, which is capable of recording up to 800 images at 4.5 MHz frame rate during the FEL burst, is employed and allows approaching the photon shot-noise limit. We review the setup and its capabilities, as well as the online and offline analysis tools provided to users., Comment: 11 figures

Published
2022
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10. The interplay of local electron correlations and ultrafast spin dynamics in fcc Ni

Author

Lojewski, Tobias, Elhanoty, Mohamed F., Guyader, Loïc Le, Grånäs, Oscar, Agarwal, Naman, Boeglin, Christine, Carley, Robert, Castoldi, Andrea, David, Christian, Deiter, Carsten, Döring, Florian, Engel, Robin Y., Erdinger, Florian, Fangohr, Hans, Fiorini, Carlo, Fischer, Peter, Gerasimova, Natalia, Gort, Rafael, de Groot, Frank, Hansen, Karsten, Hauf, Steffen, Hickin, David, Izquierdo, Manuel, Van Kuiken, Benjamin E., Kvashnin, Yaroslav, Lambert, Charles-Henri, Lomidze, David, Maffessanti, Stefano, Mercadier, Laurent, Mercurio, Giuseppe, Miedema, Piter S., Ollefs, Katharina, Pace, Matthias, Porro, Matteo, Rezvani, Javad, Rösner, Benedikt, Rothenbach, Nico, Samartsev, Andrey, Scherz, Andreas, Schlappa, Justina, Stamm, Christian, Teichmann, Martin, Thunstrom, Patrik, Turcato, Monica, Yaroslavtsev, Alexander, Zhu, Jun, Beye, Martin, Wende, Heiko, Bovensiepen, Uwe, Eriksson, Olle, and Eschenlohr, Andrea

Subjects
Condensed Matter - Materials Science
Abstract

The complex electronic structure of metallic ferromagnets is determined by a balance between exchange interaction, electron hopping leading to band formation, and local Coulomb repulsion. The interplay between the respective terms of the Hamiltonian is of fundamental interest, since it produces most, if not all, of the exotic phenomena observed in the solid state. By combining high energy and temporal resolution in femtosecond time-resolved X-ray absorption spectroscopy with ab initio time-dependent density functional theory we analyze the electronic structure in fcc Ni on the time scale of these interactions in a pump-probe experiment. We distinguish transient broadening and energy shifts in the absorption spectra, which we demonstrate to be caused by electron repopulation and correlation-induced modifications of the electronic structure, respectively. Importantly, the theoretical description of this experimental result hence requires to take the local Coulomb interaction into account, revealing a temporal interplay between band formation, exchange interaction, and Coulomb repulsion.

Published
2022

12. Megahertz‐rate ultrafast X‐ray scattering and holographic imaging at the European XFEL

Author

Hagström, Nanna Zhou, Schneider, Michael, Kerber, Nico, Yaroslavtsev, Alexander, Parra, Erick Burgos, Beg, Marijan, Lang, Martin, Günther, Christian M, Seng, Boris, Kammerbauer, Fabian, Popescu, Horia, Pancaldi, Matteo, Neeraj, Kumar, Polley, Debanjan, Jangid, Rahul, Hrkac, Stjepan B, Patel, Sheena KK, Ovcharenko, Sergei, Turenne, Diego, Ksenzov, Dmitriy, Boeglin, Christine, Baidakova, Marina, von Korff Schmising, Clemens, Borchert, Martin, Vodungbo, Boris, Chen, Kai, Luo, Chen, Radu, Florin, Müller, Leonard, Flórez, Miriam Martínez, Philippi-Kobs, André, Riepp, Matthias, Roseker, Wojciech, Grübel, Gerhard, Carley, Robert, Schlappa, Justine, Van Kuiken, Benjamin E, Gort, Rafael, Mercadier, Laurent, Agarwal, Naman, Le Guyader, Loïc, Mercurio, Giuseppe, Teichmann, Martin, Delitz, Jan Torben, Reich, Alexander, Broers, Carsten, Hickin, David, Deiter, Carsten, Moore, James, Rompotis, Dimitrios, Wang, Jinxiong, Kane, Daniel, Venkatesan, Sandhya, Meier, Joachim, Pallas, Florent, Jezynski, Tomasz, Lederer, Maximilian, Boukhelef, Djelloul, Szuba, Janusz, Wrona, Krzysztof, Hauf, Steffen, Zhu, Jun, Bergemann, Martin, Kamil, Ebad, Kluyver, Thomas, Rosca, Robert, Spirzewski, Michał, Kuster, Markus, Turcato, Monica, Lomidze, David, Samartsev, Andrey, Engelke, Jan, Porro, Matteo, Maffessanti, Stefano, Hansen, Karsten, Erdinger, Florian, Fischer, Peter, Fiorini, Carlo, Castoldi, Andrea, Manghisoni, Massimo, Wunderer, Cornelia Beatrix, Fullerton, Eric E, Shpyrko, Oleg G, Gutt, Christian, Sanchez-Hanke, Cecilia, Dürr, Hermann A, Iacocca, Ezio, Nembach, Hans T, Keller, Mark W, Shaw, Justin M, Silva, Thomas J, Kukreja, Roopali, Fangohr, Hans, Eisebitt, Stefan, Kläui, Mathias, Jaouen, Nicolas, Scherz, Andreas, Bonetti, Stefano, and Jal, Emmanuelle

Subjects
X-Rays, Lasers, Radiography, Holography, holography, magnetic X-ray scattering, soft X-rays, ultrafast X-ray imaging, XFEL, Condensed Matter Physics, Optical Physics, Physical Chemistry (incl. Structural), Biophysics
Abstract

The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, from chemistry to biology, giving researchers access to X-rays with unprecedented brightness, coherence and pulse duration. All XFEL facilities built until recently provided X-ray pulses at a relatively low repetition rate, with limited data statistics. Here, results from the first megahertz-repetition-rate X-ray scattering experiments at the Spectroscopy and Coherent Scattering (SCS) instrument of the European XFEL are presented. The experimental capabilities that the SCS instrument offers, resulting from the operation at megahertz repetition rates and the availability of the novel DSSC 2D imaging detector, are illustrated. Time-resolved magnetic X-ray scattering and holographic imaging experiments in solid state samples were chosen as representative, providing an ideal test-bed for operation at megahertz rates. Our results are relevant and applicable to any other non-destructive XFEL experiments in the soft X-ray range.

Published
2022

27. Optical control of 4 f orbital state in rare-earth metals

Author

Thielemann-Kühn, Nele, primary, Amrhein, Tim, additional, Bronsch, Wibke, additional, Jana, Somnath, additional, Pontius, Niko, additional, Engel, Robin Y., additional, Miedema, Piter S., additional, Legut, Dominik, additional, Carva, Karel, additional, Atxitia, Unai, additional, van Kuiken, Benjamin E., additional, Teichmann, Martin, additional, Carley, Robert E., additional, Mercadier, Laurent, additional, Yaroslavtsev, Alexander, additional, Mercurio, Giuseppe, additional, Le Guyader, Loïc, additional, Agarwal, Naman, additional, Gort, Rafael, additional, Scherz, Andres, additional, Dziarzhytski, Siarhei, additional, Brenner, Günter, additional, Pressacco, Federico, additional, Wang, Ru-Pan, additional, Schunck, Jan O., additional, Sinha, Mangalika, additional, Beye, Martin, additional, Chiuzbăian, Gheorghe S., additional, Oppeneer, Peter M., additional, Weinelt, Martin, additional, and Schüßler-Langeheine, Christian, additional

Published
2024
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28. Optical control of 4f orbital state in rare-earth metals

Author

Thielemann-Kühn, Nele, Amrhein, Tim, Bronsch, Wibke, Jana, Somnath, Pontius, Niko, Engel, Robin Y., Miedema, Piter S., Legut, Dominik, Carva, Karel, Atxitia, Unai, van Kuiken, Benjamin E., Teichmann, Martin, Carley, Robert E., Mercadier, Laurent, Yaroslavtsev, Alexander, Mercurio, Giuseppe, Le Guyader, Loic, Agarwal, Naman, Gort, Rafael, Scherz, Andres, Dziarzhytski, Siarhei, Brenner, Günter, Pressacco, Federico, Wang, Ru-Pan, Schunck, Jan O., Sinha, Mangalika, Beye, Martin, Chiuzbaian, Gheorghe S., Oppeneer, Peter M., Weinelt, Martin, Schüssler-Langeheine, Christian, Thielemann-Kühn, Nele, Amrhein, Tim, Bronsch, Wibke, Jana, Somnath, Pontius, Niko, Engel, Robin Y., Miedema, Piter S., Legut, Dominik, Carva, Karel, Atxitia, Unai, van Kuiken, Benjamin E., Teichmann, Martin, Carley, Robert E., Mercadier, Laurent, Yaroslavtsev, Alexander, Mercurio, Giuseppe, Le Guyader, Loic, Agarwal, Naman, Gort, Rafael, Scherz, Andres, Dziarzhytski, Siarhei, Brenner, Günter, Pressacco, Federico, Wang, Ru-Pan, Schunck, Jan O., Sinha, Mangalika, Beye, Martin, Chiuzbaian, Gheorghe S., Oppeneer, Peter M., Weinelt, Martin, and Schüssler-Langeheine, Christian

Abstract

A change of orbital state alters the coupling between ions and their surroundings drastically. Orbital excitations are hence key to understand and control interaction of ions. Rare-earth elements with strong magneto-crystalline anisotropy (MCA) are important ingredients for magnetic devices. Thus, control of their localized 4f magnetic moments and anisotropy is one major challenge in ultrafast spin physics. With time-resolved x-ray absorption and resonant inelastic scattering experiments, we show for Tb metal that 4f-electronic excitations out of the ground-state multiplet occur after optical pumping. These excitations are driven by inelastic 5d-4f-electron scattering, altering the 4f-orbital state and consequently the MCA with important implications for magnetization dynamics in 4f-metals and more general for the excitation of localized electronic states in correlated materials.

Published
2024
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29. Observation of fluctuation-mediated picosecond nucleation of a topological phase

Author

Büttner, Felix, Pfau, Bastian, Böttcher, Marie, Schneider, Michael, Mercurio, Giuseppe, Günther, Christian M., Hessing, Piet, Klose, Christopher, Wittmann, Angela, Gerlinger, Kathinka, Kern, Lisa-Marie, Strüber, Christian, von Korff Schmising, Clemens, Fuchs, Josefin, Engel, Dieter, Churikova, Alexandra, Huang, Siying, Suzuki, Daniel, Lemesh, Ivan, Huang, Mantao, Caretta, Lucas, Weder, David, Gaida, John H., Möller, Marcel, Harvey, Tyler R., Zayko, Sergey, Bagschik, Kai, Carley, Robert, Mercadier, Laurent, Schlappa, Justine, Yaroslavtsev, Alexander, Le Guyarder, Loïc, Gerasimova, Natalia, Scherz, Andreas, Deiter, Carsten, Gort, Rafael, Hickin, David, Zhu, Jun, Turcato, Monica, Lomidze, David, Erdinger, Florian, Castoldi, Andrea, Maffessanti, Stefano, Porro, Matteo, Samartsev, Andrey, Sinova, Jairo, Ropers, Claus, Mentink, Johan H., Dupé, Bertrand, Beach, Geoffrey S. D., and Eisebitt, Stefan

Published
2021
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31. Short nanometer range optically induced magnetic fluctuations accompanying ultrafast demagnetization of nanoscale ferromagnetic domains

Author

Suturin, Sergey M., primary, Philippi-Kobs, Andre, additional, Carley, Robert, additional, Gort, Rafael, additional, Grübel, Gerhard, additional, Jal, Emmanuelle, additional, Baidakova, Marina V., additional, Lobanova, Eugeniya Yu., additional, Mercadier, Laurent, additional, Molodtsov, Serguei L., additional, Müller, Leonard, additional, Potorochin, Dmitrii V., additional, Riepp, Matthias, additional, Roseker, Wojciech, additional, Scherz, Andreas, additional, Schlappa, Justine, additional, Le Guyader, Loïc, additional, Mercurio, Giuseppe, additional, Turcato, Monica, additional, Van Kuiken, Benjamin, additional, Yaroslavtsev, Alexander, additional, Deviatov, Alexander Y., additional, Kvashnin, Yaroslav O., additional, Lichtenstein, Alexander I., additional, Mazurenko, Vladimir V., additional, and Pronin, Igor I., additional

Published
2023
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32. Transient Non‐Collinear Magnetic State for All‐Optical Magnetization Switching

Author

Parchenko, Sergii, primary, Frej, Antoni, additional, Ueda, Hiroki, additional, Carley, Robert, additional, Mercadier, Laurent, additional, Gerasimova, Natalia, additional, Mercurio, Giuseppe, additional, Schlappa, Justine, additional, Yaroslavtsev, Alexander, additional, Agarwal, Naman, additional, Gort, Rafael, additional, Scherz, Andreas, additional, Zvezdin, Anatoly, additional, Stupakiewicz, Andrzej, additional, and Staub, Urs, additional

Published
2023
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33. Electron population dynamics in resonant non-linear x-ray absorption in nickel at a free-electron laser

Author

Engel, Robin Y., primary, Alexander, Oliver, additional, Atak, Kaan, additional, Bovensiepen, Uwe, additional, Buck, Jens, additional, Carley, Robert, additional, Cascella, Michele, additional, Chardonnet, Valentin, additional, Chiuzbaian, Gheorghe Sorin, additional, David, Christian, additional, Döring, Florian, additional, Eschenlohr, Andrea, additional, Gerasimova, Natalia, additional, Groot, Frank de, additional, Guyader, Loïc Le, additional, Humphries, Oliver S., additional, Izquierdo, Manuel, additional, Jal, Emmanuelle, additional, Kubec, Adam, additional, Laarmann, Tim, additional, Lambert, Charles-Henri, additional, Lüning, Jan, additional, Marangos, Jonathan P., additional, Mercadier, Laurent, additional, Mercurio, Giuseppe, additional, Miedema, Piter S., additional, Ollefs, Katharina, additional, Pfau, Bastian, additional, Rösner, Benedikt, additional, Rossnagel, Kai, additional, Rothenbach, Nico, additional, Scherz, Andreas, additional, Schlappa, Justine, additional, Scholz, Markus, additional, Schunck, Jan O., additional, Setoodehnia, Kiana, additional, Stamm, Christian, additional, Techert, Simone, additional, Vinko, Sam M., additional, Wende, Heiko, additional, Yaroslavtsev, Alexander A., additional, Yin, Zhong, additional, and Beye, Martin, additional

Published
2023
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36. Development of a new apparatus for coherent control in sodium atoms and dimers

Author

Carley, Robert Edward

Subjects
516.382
Abstract

This thesis presents original work contributing to the understanding of coherent control of wave packet dynamics in atomic and molecular systems excited by sequences of ultrafast laser pulses. An introduction to coherent control and a review of the literature is presented in chapter 1. Different approaches to coherent control are considered from the perspective of the phase complexity of the light fields used to achieve them, starting with a single transform-limited pulse, advancing through two-colour and multi-pulse schemes to chirped pulses, and finally arbitrarily shaped pulses. The purpose of this literature review is to position the work described in this thesis within the context of contemporary coherent control. In particular, our approach is seen to be in line with the current trend towards understanding the physics underlying coherent control processes. In chapter 2, development of a sodium atom and dimer beam source for use in optical coherent control experiments is described. The concepts of molecular beams are introduced along with a brief review of the literature on sodium atom and dimer beams. The beam source is considered in two parts. Firstly the sodium oven and nozzle are described in detail, along with the vacuum chamber that houses them. This is followed by a description of the experimental chamber, which contains a time-of-flight mass spectrometer. Finally a number of potential improvements to the system are discussed. Experiments to control the angular momentum composition of Rydberg electronic wave packets in atomic sodium are reported in chapter 3. The control scheme uses phase-locked pairs of transform-limited picosecond laser pulses to create pairs of identical radial wave packets in the Rydberg states. Quantum interference between the wave packets, or the excitation pathways to them, is manipulated to control the total angular composition of the resultant wave packet, which is detected either by the optical Ramsey method or by state-selective field ionisation. The results are interpreted both from the perspective of time evolution of the wave packet and the frequency content of the laser fields. The control strategy is then extended theoretically by the inclusion of linear chirp in one of the laser pulses. Chapter 4 describes progress towards a novel experiment for optical coherent control of vibrational wave packet dynamics in the sodium dimer. A coherent superposition of high-lying Rydberg states of the Na2 is excited by the broad bandwidth of a femtosecond laser pulse. The Rydberg states converge to several vibrational ionisation limits of the dimer, so the excitation effectively forms a vibrational wave packet in the X+ 22g+ ionic potential. Excitation of several wave packets by a series of phase-locked transform-limited pulses allows control over the composition and dynamics of the wave packet, and its detection using a combination of the optical Ramsey method and pulsed-field ionisation techniques adapted from ZEKE spectroscopy. A simple genetic algorithm is presented in chapter 5. It has been implemented to investigate the suitably of this type of optimisation procedure in simulations of Rydberg electronic wave packet coherent control in atomic sodium. The operation of the algorithm is described in detail. It is then tested against known solutions for two experimental scenarios: coherent control based on pairs of transform-limited laser pulses and transform-limited first pulse followed by a chirped second pulse. The behaviour of the algorithm is discussed in detail for each of these cases. Finally, the potential for application of the algorithm to unknown problems is briefly discussed.

Published
2005

38. The interplay of local electron correlations and ultrafast spin dynamics in fcc Ni

Author

Lojewski, Tobias, primary, Elhanoty, Mohamed F., additional, Le Guyader, Loïc, additional, Grånäs, Oscar, additional, Agarwal, Naman, additional, Boeglin, Christine, additional, Carley, Robert, additional, Castoldi, Andrea, additional, David, Christian, additional, Deiter, Carsten, additional, Döring, Florian, additional, Engel, RobinY, additional, Erdinger, Florian, additional, Fangohr, Hans, additional, Fiorini, Carlo, additional, Fischer, Peter, additional, Gerasimova, Natalia, additional, Gort, Rafael, additional, deGroot, Frank, additional, Hansen, Karsten, additional, Hauf, Steffen, additional, Hickin, David, additional, Izquierdo, Manuel, additional, Van Kuiken, Benjamin E., additional, Kvashnin, Yaroslav, additional, Lambert, Charles-Henri, additional, Lomidze, David, additional, Maffessanti, Stefano, additional, Mercadier, Laurent, additional, Mercurio, Giuseppe, additional, Miedema, Piter S., additional, Ollefs, Katharina, additional, Pace, Matthias, additional, Porro, Matteo, additional, Rezvani, Javad, additional, Rösner, Benedikt, additional, Rothenbach, Nico, additional, Samartsev, Andrey, additional, Scherz, Andreas, additional, Schlappa, Justina, additional, Stamm, Christian, additional, Teichmann, Martin, additional, Thunström, Patrik, additional, Turcato, Monica, additional, Yaroslavtsev, Alexander, additional, Zhu, Jun, additional, Beye, Martin, additional, Wende, Heiko, additional, Bovensiepen, Uwe, additional, Eriksson, Olle, additional, and Eschenlohr, Andrea, additional

Published
2023
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39. Electron population dynamics in resonant non-linear x-ray absorption in nickel at a free-electron laser

Author

Engel, Robin Y., Alexander, Oliver, Atak, Kaan, Bovensiepen, Uwe, Buck, Jens, Carley, Robert, Cascella, Michele, Chardonnet, Valentin, Chiuzbaian, Gheorghe Sorin, David, Christian, Doring, Florian, Eschenlohr, Andrea, Gerasimova, Natalia, de Groot, Frank, Le Guyader, Loic, Humphries, Oliver S., Izquierdo, Manuel, Jal, Emmanuelle, Kubec, Adam, Laarmann, Tim, Lambert, Charles-Henri, Luening, Jan, Marangos, Jonathan P., Mercadier, Laurent, Mercurio, Giuseppe, Miedema, Piter S., Ollefs, Katharina, Pfau, Bastian, Rosner, Benedikt, Rossnagel, Kai, Rothenbach, Nico, Scherz, Andreas, Schlappa, Justine, Scholz, Markus, Schunck, Jan O., Setoodehnia, Kiana, Stamm, Christian, Techert, Simone, Vinko, Sam M., Wende, Heiko, Yaroslavtsev, Alexander A., Yin, Zhong, Beye, Martin, Engel, Robin Y., Alexander, Oliver, Atak, Kaan, Bovensiepen, Uwe, Buck, Jens, Carley, Robert, Cascella, Michele, Chardonnet, Valentin, Chiuzbaian, Gheorghe Sorin, David, Christian, Doring, Florian, Eschenlohr, Andrea, Gerasimova, Natalia, de Groot, Frank, Le Guyader, Loic, Humphries, Oliver S., Izquierdo, Manuel, Jal, Emmanuelle, Kubec, Adam, Laarmann, Tim, Lambert, Charles-Henri, Luening, Jan, Marangos, Jonathan P., Mercadier, Laurent, Mercurio, Giuseppe, Miedema, Piter S., Ollefs, Katharina, Pfau, Bastian, Rosner, Benedikt, Rossnagel, Kai, Rothenbach, Nico, Scherz, Andreas, Schlappa, Justine, Scholz, Markus, Schunck, Jan O., Setoodehnia, Kiana, Stamm, Christian, Techert, Simone, Vinko, Sam M., Wende, Heiko, Yaroslavtsev, Alexander A., Yin, Zhong, and Beye, Martin

Abstract

Free-electron lasers provide bright, ultrashort, and monochromatic x-ray pulses, enabling novel spectroscopic measurements not only with femtosecond temporal resolution: The high fluence of their x-ray pulses can also easily enter the regime of the non-linear x-ray-matter interaction. Entering this regime necessitates a rigorous analysis and reliable prediction of the relevant non-linear processes for future experiment designs. Here, we show non-linear changes in the L-3-edge absorption of metallic nickel thin films, measured with fluences up to 60 J/cm(2). We present a simple but predictive rate model that quantitatively describes spectral changes based on the evolution of electronic populations within the pulse duration. Despite its simplicity, the model reaches good agreement with experimental results over more than three orders of magnitude in fluence, while providing a straightforward understanding of the interplay of physical processes driving the non-linear changes. Our findings provide important insights for the design and evaluation of future high-fluence free-electron laser experiments and contribute to the understanding of non-linear electron dynamics in x-ray absorption processes in solids at the femtosecond timescale.

Published
2023
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40. Short nanometer range optically induced magnetic fluctuations accompanying ultrafast demagnetization of nanoscale ferromagnetic domains

Author

Suturin, Sergey M., Philippi-Kobs, Andre, Carley, Robert, Gort, Rafael, Grübel, Gerhard, Jal, Emmanuelle, Baidakova, Marina V., Lobanova, Eugeniya Yu., Mercadier, Laurent, Molodtsov, Serguei L., Müller, Leonard, Potorochin, Dmitrii V., Riepp, Matthias, Roseker, Wojciech, Scherz, Andreas, Schlappa, Justine, Le Guyader, Loïc, Mercurio, Giuseppe, Turcato, Monica, Van Kuiken, Benjamin, Yaroslavtsev, Alexander, Deviatov, Alexander Y., Kvashnin, Yaroslav O., Lichtenstein, Alexander I., Mazurenko, Vladimir V., Pronin, Igor I., Suturin, Sergey M., Philippi-Kobs, Andre, Carley, Robert, Gort, Rafael, Grübel, Gerhard, Jal, Emmanuelle, Baidakova, Marina V., Lobanova, Eugeniya Yu., Mercadier, Laurent, Molodtsov, Serguei L., Müller, Leonard, Potorochin, Dmitrii V., Riepp, Matthias, Roseker, Wojciech, Scherz, Andreas, Schlappa, Justine, Le Guyader, Loïc, Mercurio, Giuseppe, Turcato, Monica, Van Kuiken, Benjamin, Yaroslavtsev, Alexander, Deviatov, Alexander Y., Kvashnin, Yaroslav O., Lichtenstein, Alexander I., Mazurenko, Vladimir V., and Pronin, Igor I.

Abstract

We have studied the nature of optically induced short-range magnetic fluctuations occurring at 10-nm length scale during ultrafast demagnetization in ferromagnetic Co/Pt multilayers. The time resolved probing of magnetization dynamics was performed with femtosecond soft x-ray pulses at the European x-ray free-electron laser. A transient high-q magnetic scattering accompanying and directly correlated to the destruction of the maze domain network has been observed at picosecond time scale in the wave vector region of 0.2–0.8nm−1. This high-q scattering has a purely magnetic nature and is ascribed to the optically induced short-range magnetic fluctuations developing in the disturbed but not fully destroyed magnetic domain network. Finally, we have simulated the optically induced response of the domain system using a two-temperature atomistic spin model and have concluded that the reason behind the high-q scattering is the laser-driven heating inducing thermal fluctuations of the domain magnetic structure.

Published
2023
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41. The interplay of local electron correlations and ultrafast spin dynamics in fcc Ni

Author

Lojewski, Tobias, Elhanoty, Mohamed F., Le Guyader, Loïc, Grånäs, Oscar, Agarwal, Naman, Boeglin, Christine, Carley, Robert, Castoldi, Andrea, David, Christian, Deiter, Carsten, Döring, Florian, Engel, Robin Y., Erdinger, Florian, Fangohr, Hans, Fiorini, Carlo, Fischer, Peter, Gerasimova, Natalia, Gort, Rafael, deGroot, Frank, Hansen, Karsten, Hauf, Steffen, Hickin, David, Izquierdo, Manuel, Van Kuiken, Benjamin E., Kvashnin, Yaroslav, Lambert, Charles Henri, Lomidze, David, Maffessanti, Stefano, Mercadier, Laurent, Mercurio, Giuseppe, Miedema, Piter S., Ollefs, Katharina, Pace, Matthias, Porro, Matteo, Rezvani, Javad, Rösner, Benedikt, Rothenbach, Nico, Samartsev, Andrey, Scherz, Andreas, Schlappa, Justina, Stamm, Christian, Teichmann, Martin, Thunström, Patrik, Turcato, Monica, Yaroslavtsev, Alexander, Zhu, Jun, Beye, Martin, Wende, Heiko, Bovensiepen, Uwe, Eriksson, Olle, Eschenlohr, Andrea, Lojewski, Tobias, Elhanoty, Mohamed F., Le Guyader, Loïc, Grånäs, Oscar, Agarwal, Naman, Boeglin, Christine, Carley, Robert, Castoldi, Andrea, David, Christian, Deiter, Carsten, Döring, Florian, Engel, Robin Y., Erdinger, Florian, Fangohr, Hans, Fiorini, Carlo, Fischer, Peter, Gerasimova, Natalia, Gort, Rafael, deGroot, Frank, Hansen, Karsten, Hauf, Steffen, Hickin, David, Izquierdo, Manuel, Van Kuiken, Benjamin E., Kvashnin, Yaroslav, Lambert, Charles Henri, Lomidze, David, Maffessanti, Stefano, Mercadier, Laurent, Mercurio, Giuseppe, Miedema, Piter S., Ollefs, Katharina, Pace, Matthias, Porro, Matteo, Rezvani, Javad, Rösner, Benedikt, Rothenbach, Nico, Samartsev, Andrey, Scherz, Andreas, Schlappa, Justina, Stamm, Christian, Teichmann, Martin, Thunström, Patrik, Turcato, Monica, Yaroslavtsev, Alexander, Zhu, Jun, Beye, Martin, Wende, Heiko, Bovensiepen, Uwe, Eriksson, Olle, and Eschenlohr, Andrea

Abstract

The complex electronic structure of metallic ferromagnets is determined by a balance between exchange interaction, electron hopping leading to band formation, and local Coulomb repulsion. By combining high energy and temporal resolution in femtosecond time-resolved X-ray absorption spectroscopy with ab initio time-dependent density functional theory we analyze the electronic structure in fcc Ni on the time scale of these interactions in a pump-probe experiment. We distinguish transient broadening and energy shifts in the absorption spectra, which we demonstrate to be captured by electron repopulation respectively correlation-induced modifications of the electronic structure, requiring to take the local Coulomb interaction into account.

Published
2023

42. The interplay of local electron correlations and ultrafast spin dynamics in fcc Ni

Author

Materials Chemistry and Catalysis, Sub Materials Chemistry and Catalysis, Lojewski, Tobias, Elhanoty, Mohamed F., Le Guyader, Loïc, Grånäs, Oscar, Agarwal, Naman, Boeglin, Christine, Carley, Robert, Castoldi, Andrea, David, Christian, Deiter, Carsten, Döring, Florian, Engel, Robin Y., Erdinger, Florian, Fangohr, Hans, Fiorini, Carlo, Fischer, Peter, Gerasimova, Natalia, Gort, Rafael, deGroot, Frank, Hansen, Karsten, Hauf, Steffen, Hickin, David, Izquierdo, Manuel, Van Kuiken, Benjamin E., Kvashnin, Yaroslav, Lambert, Charles Henri, Lomidze, David, Maffessanti, Stefano, Mercadier, Laurent, Mercurio, Giuseppe, Miedema, Piter S., Ollefs, Katharina, Pace, Matthias, Porro, Matteo, Rezvani, Javad, Rösner, Benedikt, Rothenbach, Nico, Samartsev, Andrey, Scherz, Andreas, Schlappa, Justina, Stamm, Christian, Teichmann, Martin, Thunström, Patrik, Turcato, Monica, Yaroslavtsev, Alexander, Zhu, Jun, Beye, Martin, Wende, Heiko, Bovensiepen, Uwe, Eriksson, Olle, Eschenlohr, Andrea, Materials Chemistry and Catalysis, Sub Materials Chemistry and Catalysis, Lojewski, Tobias, Elhanoty, Mohamed F., Le Guyader, Loïc, Grånäs, Oscar, Agarwal, Naman, Boeglin, Christine, Carley, Robert, Castoldi, Andrea, David, Christian, Deiter, Carsten, Döring, Florian, Engel, Robin Y., Erdinger, Florian, Fangohr, Hans, Fiorini, Carlo, Fischer, Peter, Gerasimova, Natalia, Gort, Rafael, deGroot, Frank, Hansen, Karsten, Hauf, Steffen, Hickin, David, Izquierdo, Manuel, Van Kuiken, Benjamin E., Kvashnin, Yaroslav, Lambert, Charles Henri, Lomidze, David, Maffessanti, Stefano, Mercadier, Laurent, Mercurio, Giuseppe, Miedema, Piter S., Ollefs, Katharina, Pace, Matthias, Porro, Matteo, Rezvani, Javad, Rösner, Benedikt, Rothenbach, Nico, Samartsev, Andrey, Scherz, Andreas, Schlappa, Justina, Stamm, Christian, Teichmann, Martin, Thunström, Patrik, Turcato, Monica, Yaroslavtsev, Alexander, Zhu, Jun, Beye, Martin, Wende, Heiko, Bovensiepen, Uwe, Eriksson, Olle, and Eschenlohr, Andrea

Published
2023

44. Photon-shot-noise-limited transient absorption soft X-ray spectroscopy at the European XFEL

Author

Le Guyader, Loïc, primary, Eschenlohr, Andrea, additional, Beye, Martin, additional, Schlotter, William, additional, Döring, Florian, additional, Carinan, Cammille, additional, Hickin, David, additional, Agarwal, Naman, additional, Boeglin, Christine, additional, Bovensiepen, Uwe, additional, Buck, Jens, additional, Carley, Robert, additional, Castoldi, Andrea, additional, D'Elia, Alessandro, additional, Delitz, Jan-Torben, additional, Ehsan, Wajid, additional, Engel, Robin, additional, Erdinger, Florian, additional, Fangohr, Hans, additional, Fischer, Peter, additional, Fiorini, Carlo, additional, Föhlisch, Alexander, additional, Gelisio, Luca, additional, Gensch, Michael, additional, Gerasimova, Natalia, additional, Gort, Rafael, additional, Hansen, Karsten, additional, Hauf, Steffen, additional, Izquierdo, Manuel, additional, Jal, Emmanuelle, additional, Kamil, Ebad, additional, Karabekyan, Suren, additional, Kluyver, Thomas, additional, Laarmann, Tim, additional, Lojewski, Tobias, additional, Lomidze, David, additional, Maffessanti, Stefano, additional, Mamyrbayev, Talgat, additional, Marcelli, Augusto, additional, Mercadier, Laurent, additional, Mercurio, Giuseppe, additional, Miedema, Piter S., additional, Ollefs, Katharina, additional, Rossnagel, Kai, additional, Rösner, Benedikt, additional, Rothenbach, Nico, additional, Samartsev, Andrey, additional, Schlappa, Justine, additional, Setoodehnia, Kiana, additional, Sorin Chiuzbaian, Gheorghe, additional, Spieker, Lea, additional, Stamm, Christian, additional, Stellato, Francesco, additional, Techert, Simone, additional, Teichmann, Martin, additional, Turcato, Monica, additional, Van Kuiken, Benjamin, additional, Wende, Heiko, additional, Yaroslavtsev, Alexander, additional, Zhu, Jun, additional, Molodtsov, Serguei, additional, David, Christian, additional, Porro, Matteo, additional, and Scherz, Andreas, additional

Published
2023
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45. Transient Absorption of Warm Dense Matter Created by an X-Ray Free-Electron Laser

Author

Mercadier, Laurent, primary, Benediktovitch, Andrei, additional, Krusic, Spela, additional, Schlappa, J., additional, Agåker, Marcus, additional, Carley, Robert, additional, Fazio, Giuseppe, additional, Gerasimova, Natalia, additional, Kim, Young Yong, additional, Guyader, Loïc Le, additional, Mercurio, Giuseppe, additional, Parchenko, Sergii, additional, Rubensson, Jan-Erik, additional, Serkez, Svitozar, additional, Stransky, Michal, additional, Teichmann, Martin, additional, Yin, Zhong, additional, Žitnik, Matjaz, additional, Scherz, Andreas, additional, Ziaja-Motyka, Beata, additional, and Rohringer, Nina, additional

Published
2023
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46. Editors' Introduction

Author

Carley, Robert, primary, carrington, andré m., additional, Jones, Stefanie A, additional, Laine, Eero, additional, Spurgas, Alyson K., additional, and Sula, Chris Alen, additional

Published
2022
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47. Electron Dynamics at High-Energy Densities in Nickel from Non-linear Resonant X-ray Absorption Spectra

Author

Engel, Robin Y., Alexander, Oliver, Atak, Kaan, Bovensiepen, Uwe, Buck, Jens, Carley, Robert, Cascella, Michele, Chardonnet, Valentin, Chiuzbaian, Gheorghe Sorin, David, Christian, Döring, Florian, Eschenlohr, Andrea, Gerasimova, Natalia, de Groot, Frank, Guyader, Loïc Le, Humphries, Oliver S., Izquierdo, Manuel, Jal, Emmanuelle, Kubec, Adam, Laarmann, Tim, Lambert, Charles-Henri, Lüning, Jan, Marangos, Jonathan P., Mercadier, Laurent, Mercurio, Giuseppe, Miedema, Piter S., Ollefs, Katharina, Pfau, Bastian, Rösner, Benedikt, Rossnagel, Kai, Rothenbach, Nico, Scherz, Andreas, Schlappa, Justine, Scholz, Markus, Schunck, Jan O., Setoodehnia, Kiana, Stamm, Christian, Techert, Simone, Vinko, Sam M., Wende, Heiko, Yaroslavtsev, Alexander A., Yin, Zhong, and Beye, Martin

Subjects
Condensed Matter - Materials Science, Materials Science, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences
Abstract

The pulse intensity from X-ray free-electron lasers (FELs) can create extreme excitation densities in solids, entering the regime of non-linear X-ray-matter interactions. We show L3-edge absorption spectra of metallic nickel thin films with fluences entering a regime where several X-ray photons are incident per absorption cross-section. Main features of the observed non-linear spectral changes are described with a predictive rate model for electron population dynamics during the pulse, utilizing a fixed density of states and tabulated ground-state properties., The main text contains 5 pages and 4 figures, the total length including supplement is 14 pages, 7 figures and one table. See also the simultaneously submitted paper about the rate model

Published
2023
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48. Megahertz-rate ultrafast X-ray scattering and holographic imaging at the European XFEL

Author

Zhou Hagström, Nanna, primary, Schneider, Michael, additional, Kerber, Nico, additional, Yaroslavtsev, Alexander, additional, Burgos Parra, Erick, additional, Beg, Marijan, additional, Lang, Martin, additional, Günther, Christian M., additional, Seng, Boris, additional, Kammerbauer, Fabian, additional, Popescu, Horia, additional, Pancaldi, Matteo, additional, Neeraj, Kumar, additional, Polley, Debanjan, additional, Jangid, Rahul, additional, Hrkac, Stjepan B., additional, Patel, Sheena K. K., additional, Ovcharenko, Sergei, additional, Turenne, Diego, additional, Ksenzov, Dmitriy, additional, Boeglin, Christine, additional, Baidakova, Marina, additional, von Korff Schmising, Clemens, additional, Borchert, Martin, additional, Vodungbo, Boris, additional, Chen, Kai, additional, Luo, Chen, additional, Radu, Florin, additional, Müller, Leonard, additional, Martínez Flórez, Miriam, additional, Philippi-Kobs, André, additional, Riepp, Matthias, additional, Roseker, Wojciech, additional, Grübel, Gerhard, additional, Carley, Robert, additional, Schlappa, Justine, additional, Van Kuiken, Benjamin E., additional, Gort, Rafael, additional, Mercadier, Laurent, additional, Agarwal, Naman, additional, Le Guyader, Loïc, additional, Mercurio, Giuseppe, additional, Teichmann, Martin, additional, Delitz, Jan Torben, additional, Reich, Alexander, additional, Broers, Carsten, additional, Hickin, David, additional, Deiter, Carsten, additional, Moore, James, additional, Rompotis, Dimitrios, additional, Wang, Jinxiong, additional, Kane, Daniel, additional, Venkatesan, Sandhya, additional, Meier, Joachim, additional, Pallas, Florent, additional, Jezynski, Tomasz, additional, Lederer, Maximilian, additional, Boukhelef, Djelloul, additional, Szuba, Janusz, additional, Wrona, Krzysztof, additional, Hauf, Steffen, additional, Zhu, Jun, additional, Bergemann, Martin, additional, Kamil, Ebad, additional, Kluyver, Thomas, additional, Rosca, Robert, additional, Spirzewski, Michał, additional, Kuster, Markus, additional, Turcato, Monica, additional, Lomidze, David, additional, Samartsev, Andrey, additional, Engelke, Jan, additional, Porro, Matteo, additional, Maffessanti, Stefano, additional, Hansen, Karsten, additional, Erdinger, Florian, additional, Fischer, Peter, additional, Fiorini, Carlo, additional, Castoldi, Andrea, additional, Manghisoni, Massimo, additional, Wunderer, Cornelia Beatrix, additional, Fullerton, Eric E., additional, Shpyrko, Oleg G., additional, Gutt, Christian, additional, Sanchez-Hanke, Cecilia, additional, Dürr, Hermann A., additional, Iacocca, Ezio, additional, Nembach, Hans T., additional, Keller, Mark W., additional, Shaw, Justin M., additional, Silva, Thomas J., additional, Kukreja, Roopali, additional, Fangohr, Hans, additional, Eisebitt, Stefan, additional, Kläui, Mathias, additional, Jaouen, Nicolas, additional, Scherz, Andreas, additional, Bonetti, Stefano, additional, and Jal, Emmanuelle, additional

Published
2022
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49. Nonequilibrium sub–10 nm spin-wave soliton formation in FePt nanoparticles

Author

Turenne, Diego, Yaroslavtsev, Alexander, Wang, Xiaocui, Unikandanuni, Vivek, Vaskivskyi, Igor, Schneider, Michael, Jal, Emmanuelle, Carley, Robert, Mercurio, Guiseppe, Gort, Rafael, Agarwal, Naman, Van Kuiken, Benjamin, Mercadier, Laurent, Schlappa, Justine, Le Guyader, Loïc, Gerasimova, Natalia, Teichmann, Martin, Lomidze, David, Castoldi, Andrea, Potorochin, Dimitri, Mukkattukavil, Deepak, Brock, Jeffrey, Zhou Hagström, Nanna, Reid, Alexander H., Shen, Xiaozhe, Wang, Xijie J., Maldonado, Pablo, Kvashnin, Yaroslav, Carva, Karel, Wang, Jian, Takahashi, Yukiko K., Fullerton, Eric E., Eisebitt, Stefan, Oppeneer, Peter M., Molodtsov, Serguei, Scherz, Andreas, Bonetti, Stefano, Iacocca, Ezio, Dürr, Hermann A., Turenne, Diego, Yaroslavtsev, Alexander, Wang, Xiaocui, Unikandanuni, Vivek, Vaskivskyi, Igor, Schneider, Michael, Jal, Emmanuelle, Carley, Robert, Mercurio, Guiseppe, Gort, Rafael, Agarwal, Naman, Van Kuiken, Benjamin, Mercadier, Laurent, Schlappa, Justine, Le Guyader, Loïc, Gerasimova, Natalia, Teichmann, Martin, Lomidze, David, Castoldi, Andrea, Potorochin, Dimitri, Mukkattukavil, Deepak, Brock, Jeffrey, Zhou Hagström, Nanna, Reid, Alexander H., Shen, Xiaozhe, Wang, Xijie J., Maldonado, Pablo, Kvashnin, Yaroslav, Carva, Karel, Wang, Jian, Takahashi, Yukiko K., Fullerton, Eric E., Eisebitt, Stefan, Oppeneer, Peter M., Molodtsov, Serguei, Scherz, Andreas, Bonetti, Stefano, Iacocca, Ezio, and Dürr, Hermann A.

Abstract

Magnetic nanoparticles such as FePt in the L10 phase are the bedrock of our current data storage technology. As the grains become smaller to keep up with technological demands, the superparamagnetic limit calls for materials with higher magnetocrystalline anisotropy. This, in turn, reduces the magnetic exchange length to just a few nanometers, enabling magnetic structures to be induced within the nanoparticles. Here, we describe the existence of spin-wave solitons, dynamic localized bound states of spin-wave excitations, in FePt nanoparticles. We show with time-resolved x-ray diffraction and micromagnetic modeling that spin-wave solitons of sub–10 nm sizes form out of the demagnetized state following femtosecond laser excitation. The measured soliton spin precession frequency of 0.1 THz positions this system as a platform to develop novel miniature devices.

Published
2022
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50. Megahertz-rate ultrafast X-ray scattering and holographic imaging at the European XFEL

Author

Zhou Hagström, Nanna, Schneider, Michael, Kerber, Nico, Yaroslavtsev, Alexander, Burgos Parra, Erick, Beg, Marijan, Lang, Martin, Günther, Christian M., Seng, Boris, Kammerbauer, Fabian, Popescu, Horia, Pancaldi, Matteo, Neeraj, Kumar, Polley, Debanjan, Jangid, Rahul, Hrkac, Stjepan B., Patel, Sheena K. K., Ovcharenko, Sergei, Turenne, Diego, Ksenzov, Dmitriy, Boeglin, Christine, Baidakova, Marina, von Korff Schmising, Clemens, Borchert, Martin, Vodungbo, Boris, Chen, Kai, Luo, Chen, Radu, Florin, Müller, Leonard, Martínez Flórez, Miriam, Philippi-Kobs, André, Riepp, Matthias, Roseker, Wojciech, Grübel, Gerhard, Carley, Robert, Schlappa, Justine, Van Kuiken, Benjamin E., Gort, Rafael, Mercadier, Laurent, Agarwal, Naman, Le Guyader, Loïc, Mercurio, Giuseppe, Teichmann, Martin, Delitz, Jan Torben, Reich, Alexander, Broers, Carsten, Hickin, David, Deiter, Carsten, Moore, James, Rompotis, Dimitrios, Wang, Jinxiong, Kane, Daniel, Venkatesan, Sandhya, Meier, Joachim, Pallas, Florent, Jezynski, Tomasz, Lederer, Maximilian, Boukhelef, Djelloul, Szuba, Janusz, Wrona, Krzysztof, Hauf, Steffen, Zhu, Jun, Bergemann, Martin, Kamil, Ebad, Kluyver, Thomas, Rosca, Robert, Spirzewski, Michal, Kuster, Markus, Turcato, Monica, Lomidze, David, Samartsev, Andrey, Engelke, Jan, Porro, Matteo, Maffessanti, Stefano, Hansen, Karsten, Erdinger, Florian, Fischer, Peter, Fiorini, Carlo, Castoldi, Andrea, Manghisoni, Massimo, Wunderer, Cornelia Beatrix, Fullerton, Eric E., Shpyrko, Oleg G., Gutt, Christian, Sanchez-Hanke, Cecilia, Dürr, Hermann A., Iacocca, Ezio, Nembach, Hans T., Keller, Mark W., Shaw, Justin M., Silva, Thomas J., Kukreja, Roopali, Fangohr, Hans, Eisebitt, Stefan, Kläui, Mathias, Jaouen, Nicolas, Scherz, Andreas, Bonetti, Stefano, Jal, Emmanuelle, Zhou Hagström, Nanna, Schneider, Michael, Kerber, Nico, Yaroslavtsev, Alexander, Burgos Parra, Erick, Beg, Marijan, Lang, Martin, Günther, Christian M., Seng, Boris, Kammerbauer, Fabian, Popescu, Horia, Pancaldi, Matteo, Neeraj, Kumar, Polley, Debanjan, Jangid, Rahul, Hrkac, Stjepan B., Patel, Sheena K. K., Ovcharenko, Sergei, Turenne, Diego, Ksenzov, Dmitriy, Boeglin, Christine, Baidakova, Marina, von Korff Schmising, Clemens, Borchert, Martin, Vodungbo, Boris, Chen, Kai, Luo, Chen, Radu, Florin, Müller, Leonard, Martínez Flórez, Miriam, Philippi-Kobs, André, Riepp, Matthias, Roseker, Wojciech, Grübel, Gerhard, Carley, Robert, Schlappa, Justine, Van Kuiken, Benjamin E., Gort, Rafael, Mercadier, Laurent, Agarwal, Naman, Le Guyader, Loïc, Mercurio, Giuseppe, Teichmann, Martin, Delitz, Jan Torben, Reich, Alexander, Broers, Carsten, Hickin, David, Deiter, Carsten, Moore, James, Rompotis, Dimitrios, Wang, Jinxiong, Kane, Daniel, Venkatesan, Sandhya, Meier, Joachim, Pallas, Florent, Jezynski, Tomasz, Lederer, Maximilian, Boukhelef, Djelloul, Szuba, Janusz, Wrona, Krzysztof, Hauf, Steffen, Zhu, Jun, Bergemann, Martin, Kamil, Ebad, Kluyver, Thomas, Rosca, Robert, Spirzewski, Michal, Kuster, Markus, Turcato, Monica, Lomidze, David, Samartsev, Andrey, Engelke, Jan, Porro, Matteo, Maffessanti, Stefano, Hansen, Karsten, Erdinger, Florian, Fischer, Peter, Fiorini, Carlo, Castoldi, Andrea, Manghisoni, Massimo, Wunderer, Cornelia Beatrix, Fullerton, Eric E., Shpyrko, Oleg G., Gutt, Christian, Sanchez-Hanke, Cecilia, Dürr, Hermann A., Iacocca, Ezio, Nembach, Hans T., Keller, Mark W., Shaw, Justin M., Silva, Thomas J., Kukreja, Roopali, Fangohr, Hans, Eisebitt, Stefan, Kläui, Mathias, Jaouen, Nicolas, Scherz, Andreas, Bonetti, Stefano, and Jal, Emmanuelle

Abstract

The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, from chemistry to biology, giving researchers access to X-rays with unprecedented brightness, coherence and pulse duration. All XFEL facilities built until recently provided X-ray pulses at a relatively low repetition rate, with limited data statistics. Here, results from the first megahertz-repetition-rate X-ray scattering experiments at the Spectroscopy and Coherent Scattering (SCS) instrument of the European XFEL are presented. The experimental capabilities that the SCS instrument offers, resulting from the operation at megahertz repetition rates and the availability of the novel DSSC 2D imaging detector, are illustrated. Time-resolved magnetic X-ray scattering and holographic imaging experiments in solid state samples were chosen as representative, providing an ideal test-bed for operation at megahertz rates. Our results are relevant and applicable to any other non-destructive XFEL experiments in the soft X-ray range.

Published
2022
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