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Your search keyword '"Hrkac, Stjepan B."' showing total 13 results
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13 results on '"Hrkac, Stjepan B."'

1. Critical slowing of the spin and charge density wave order in thin film Cr following photoexcitation

Author

Patel, Sheena K. K., Gorobtsov, Oleg Yu., Cela, Devin, Hrkac, Stjepan B., Hua, Nelson, Medapalli, Rajasekhar, Shabalin, Anatoly G., Wingert, James, Glownia, James M., Zhu, Diling, Chollet, Matthieu, Shpyrko, Oleg G., Singer, Andrej, and Fullerton, Eric E.

Subjects
Condensed Matter - Materials Science
Abstract

We report on the evolution of the charge density wave (CDW) and spin density wave (SDW) order of a chromium film following photoexcitation with an ultrafast optical laser pulse. The CDW is measured by ultrafast time-resolved x-ray diffraction of the CDW satellite that tracks the suppression and recovery of the CDW following photoexcitation. We find that as the temperature of the film approaches a discontinuous phase transition in the CDW and SDW order, the time scales of recovery increase exponentially from the expected thermal time scales. We extend a Landau model for SDW systems to account for this critical slowing with the appropriate boundary conditions imposed by the geometry of the thin film system. This model allows us to assess the energy barrier between available CDW/SDW states with different spatial periodicities., Comment: Author typo fixed

Published
2024

2. 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

3. Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer

Author

Zusin, Dmitriy, Iacocca, Ezio, Guyader, Loïc Le, Reid, Alexander H., Schlotter, William F., Liu, Tian-Min, Higley, Daniel J., Coslovich, Giacomo, Wandel, Scott F., Tengdin, Phoebe M., Patel, Sheena K. K., Shabalin, Anatoly, Hua, Nelson, Hrkac, Stjepan B., Nembach, Hans T., Shaw, Justin M., Montoya, Sergio A., Blonsky, Adam, Gentry, Christian, Hoefer, Mark A., Murnane, Margaret M., Kapteyn, Henry C., Fullerton, Eric E., Shpyrko, Oleg, Dürr, Hermann A., and Silva, T. J.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Ultrafast optical pumping of spatially nonuniform magnetic textures is known to induce far-from-equilibrium spin transport effects. Here, we use ultrafast x-ray diffraction with unprecedented dynamic range to study the laser-induced dynamics of labyrinth domain networks in ferromagnetic CoFe/Ni multilayers. We detected azimuthally isotropic, odd order, magnetic diffraction rings up to 5th order. The amplitudes of all three diffraction rings quench to different degrees within 1.6 ps. In addition, all three of the detected diffraction rings both broaden by 15% and radially contract by 6% during the quench process. We are able to rigorously quantify a 31% ultrafast broadening of the domain walls via Fourier analysis of the order-dependent quenching of the three detected diffraction rings. The broadening of the diffraction rings is interpreted as a reduction in the domain coherence length, but the shift in the ring radius, while unambiguous in its occurrence, remains unexplained. In particular, we demonstrate that a radial shift explained by domain wall broadening can be ruled out. With the unprecedented dynamic range of our data, our results provide convincing evidence that labyrinth domain structures are spatially perturbed at ultrafast speeds under far-from-equilibrium conditions, albeit the mechanism inducing the perturbations remains yet to be clarified.

Published
2020

4. Critical slowing of the spin and charge density wave order in thin film Cr following photoexcitation

Author

Patel, Sheena K. K., primary, Gorobtsov, Oleg Yu, additional, Cela, Devin, additional, Hrkac, Stjepan B., additional, Hua, Nelson, additional, Medapalli, Rajasekhar, additional, Shabalin, Anatoly G., additional, Wingert, James, additional, Glownia, James M., additional, Zhu, Diling, additional, Chollet, Matthieu, additional, Shpyrko, Oleg G., additional, Singer, Andrej, additional, and Fullerton, Eric E., additional

Published
2024
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6. Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer

Author

Zusin, Dmitriy, primary, Iacocca, Ezio, additional, Le Guyader, Loïc, additional, Reid, Alexander H., additional, Schlotter, William F., additional, Liu, Tian-Min, additional, Higley, Daniel J., additional, Coslovich, Giacomo, additional, Wandel, Scott F., additional, Tengdin, Phoebe M., additional, Patel, Sheena K. K., additional, Shabalin, Anatoly, additional, Hua, Nelson, additional, Hrkac, Stjepan B., additional, Nembach, Hans T., additional, Shaw, Justin M., additional, Montoya, Sergio A., additional, Blonsky, Adam, additional, Gentry, Christian, additional, Hoefer, Mark A., additional, Murnane, Margaret M., additional, Kapteyn, Henry C., additional, Fullerton, Eric E., additional, Shpyrko, Oleg, additional, Dürr, Hermann A., additional, and Silva, T. J., additional

Published
2022
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7. 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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8. Megahertz-rate Ultrafast X-ray Scattering and Holographic Imaging at the European XFEL

Author

Hagstr��m, Nanna Zhou, Schneider, Michael, Kerber, Nico, Yaroslavtsev, Alexander, Parra, Erick Burgos, Beg, Marijan, Lang, Martin, G��nther, 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, Pronin, Igor, Baidakova, Marina, Schmising, Clemens von Korff, Borchert, Martin, Vodungbo, Boris, Chen, Kai, Luo, Chen, Radu, Florin, M��ller, Leonard, Fl��rez, Miriam Mart��nez, Philippi-Kobs, Andr��, Riepp, Matthias, Roseker, Wojciech, Gr��bel, Gerhard, Carley, Robert, Schlappa, Justine, Van Kuiken, Benjamin, Gort, Rafael, Mercadier, Laurent, Agarwal, Naman, Guyader, Lo��c Le, 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, Micha��, 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, D��rr, Hermann A., Iacocca, Ezio, Nembach, Hans T., Keller, Mark W., Shaw, Justin M., Silva, Thomas J., Kukreja, Roopali, Fangohr, Hans, Eisebitt, Stefan, Kl��ui, Mathias, Jaouen, Nicolas, Scherz, Andreas, Bonetti, Stefano, and Jal, Emmanuelle

Subjects
Accelerator Physics (physics.acc-ph), Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, 530 Physics, Atom and Molecular Physics and Optics, Astrophysics::High Energy Astrophysical Phenomena, 0205 Optical Physics, Holography, 0204 Condensed Matter Physics, Biophysics, FOS: Physical sciences, XFEL, holography, magnetic X-ray scattering, soft X-rays, ultrafast X-ray imaging, X-Rays, Radiography, Lasers, Optical Physics, Accelerator Physics and Instrumentation, Settore ING-INF/01 - Elettronica, Accelerator Physics, Settore FIS/03 - Fisica della Materia, Mesoscale and Nanoscale Physics, cond-mat.mes-hall, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Instrumentation, physics.ins-det, physics.acc-ph, 0306 Physical Chemistry (incl. Structural), Radiation, Condensed Matter - Mesoscale and Nanoscale Physics, magnetic X ray scattering, soft X rays, ultrafast X ray imaging, Acceleratorfysik och instrumentering, Instrumentation and Detectors (physics.ins-det), 530 Physik, Condensed Matter Physics, 540 Chemie und zugeordnete Wissenschaften, Physics - Accelerator Physics, Atom- och molekylfysik och optik, Den kondenserade materiens fysik, Instrumentation and Detectors, Physical Chemistry (incl. Structural)
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, we present the results from the first megahertz repetition rate X-ray scattering experiments at the Spectroscopy and Coherent Scattering (SCS) instrument of the European XFEL. We illustrate the experimental capabilities that the SCS instrument offers, resulting from the operation at MHz repetition rates and the availability of the novel DSSC 2D imaging detector. 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., Comment: 13 pages, 5 figures. Supplementary Information as ancillary file

Published
2022
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10. Visualizing Intrinsic 3D‐Strain Distribution in Gold Coated ZnO Microstructures by Bragg Coherent X‐Ray Diffraction Imaging and Transmission Electron Microscopy with Respect to Piezotronic Applications

Author

Jordt, Philipp, primary, Wolff, Niklas, additional, Hrkac, Stjepan B., additional, Shree, Sindu, additional, Wang, Di, additional, Harder, Ross J., additional, Kübel, Christian, additional, Adelung, Rainer, additional, Shpyrko, Oleg G., additional, Magnussen, Olaf M., additional, Kienle, Lorenz, additional, and Murphy, Bridget M., additional

Published
2021
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13. Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer

Author

Iacocca, Ezio, Le Guyader, Loic, Reid, Alexander H, Schlotter, William F, Liu, Tian-Min, Higley, Daniel J, Coslovich, Giacomo, Wandel, Scott F, Tengdin, Phoebe M, Patel, Sheena K K, Shabalin, Anatoly, Hua, Nelson, Hrkac, Stjepan B, Nembach, Hans T, Shaw, Justin M, Montoya, Sergio A, Blonsky, Adam, Gentry, Christian, Hoefer, Mark A, Murnane, Margaret M, Kapteyn, Henry C, Fullerton, Eric E, Shpyrko, Oleg, Dürr, Hermann A, and Silva, T J

Abstract

Ultrafast optical pumping of spatially nonuniform magnetic textures is known to induce far-from-equilibrium spin transport effects. Here, we use ultrafast x-ray diffraction with unprecedented dynamic range to study the laser-induced dynamics of labyrinth domain networks in ferromagnetic CoFe/Ni multilayers. We detected azimuthally isotropic, odd order, magnetic diffraction rings up to 5th order. The amplitudes of all three diffraction rings quench to different degrees within 1.6 ps. In addition, all three of the detected diffraction rings both broaden by 15% and radially contract by 6% during the quench process. We are able to rigorously quantify a 31% ultrafast broadening of the domain walls via Fourier analysis of the order-dependent quenching of the three detected diffraction rings. The broadening of the diffraction rings is interpreted as a reduction in the domain coherence length, but the shift in the ring radius, while unambiguous in its occurrence, remains unexplained. In particular, we demonstrate that a radial shift explained by domain wall broadening can be ruled out. With the unprecedented dynamic range of our data, our results provide convincing evidence that labyrinth domain structures are spatially perturbed at ultrafast speeds under far-from-equilibrium conditions, albeit the mechanism inducing the perturbations remains yet to be clarified.

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