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4 results on '"microstructure dynamics"'

1. Dynamics of the MnAs α/β-Striped Microstructure and of the Fe Magnetization Reversal in Fe/MnAs/GaAs(001): An Optical-Laser Pump--Free-Electron-Laser Probe Scattering Experiment.

Author

Vidal, Franck, Lounis, Lounès, Spezzani, Carlo, Ferrari, Eugenio, Delaunay, Renaud, Ciavardini, Alessandra, Popescu, Horia, Eddrief, Mahmoud, Yunlin Zheng, Capotondi, Flavio, Pedersoli, Emanuele, Svetina, Cristian, Raimondi, Lorenzo, Zangrando, Marco, Ivanov, Rosen, Nikolov, Ivaylo, Demidovich, Alexander, Danailov, Miltcho B., De Ninno, Giovanni, and Allaria, Enrico

Subjects
IRON, MAGNETIC properties of metals, MAGNETIZATION, GALLIUM arsenide, MANGANESE, ULTRASHORT laser pulses
Abstract

It was shown recently that the Fe magnetization reversal in the Fe/MnAs/GaAs(001) epitaxial system, attained by temperature control of the regular stripe pattern of the MnAs α-and β-phases, can also be driven by an ultrashort optical laser pulse. In the present time-resolved scattering experiment, we address the dynamics of the MnAs α-β self-organized stripe pattern induced by a 100 fs optical laser pulse, using as a probe the XUV radiation from the FERMI free-electron laser. We observe a loss in the diffraction intensity from the ordered α-β stripes that occurs at two characteristic timescales in the range of ~10-12 and ~10-10. We associate the first intensity drop with ultrafast electron-lattice energy exchange processes within the laser-MnAs interaction volume and the second with thermal diffusion towards the MnAs/GaAs interface. With the support of model calculations, the observed dynamics are interpreted in terms of the formation of a laterally homogeneous MnAs overlayer, the thickness of which evolves in time, correlating the MnAs microstructure dynamics with the Fe magnetization response. [ABSTRACT FROM AUTHOR]

Published
2017
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2. Schwingungen in Mikrostrukturen 3D-Laservibrometer-Mikroskop mit nur einem Messstrahl Vibrations in Microstructures: A 3D-Laser Vibrometer Microscope with Merely One Measuring Beam.

Author

Winter, Marcus, Steger, Heinrich, Giesen, Moritz, Dräbenstedt, Alexander, Kowarsch, Robert, Ochs, Wanja, and Rembe, Christian

Abstract

Wir stellen ein neues Messmikroskop vor, welches die Erfassung von dreidimensionalen Schwingungsparametern mikroskopischer Objekte in Echtzeit ermöglicht. Das Messsystem besteht aus einem einzigen, integrierten Messkopf, der den von einem mikroskopischen Messobjekt in drei Raumrichtungen gestreuten Laserstrahl analysiert und daraus die dreidimensionale Objektbewegung bestimmt. Die Messpunktgröße ist hierbei kleiner als 4 µm, wobei optisches Übersprechen zwischen den drei Analyserichtungen vermieden wird, da es nur einen Messlaserstrahl gibt. We present a new type of measurement microscope which is able to detect three-dimensional vibration parameters of microscopic objects in real-time. The measurement system comprises a single, integrated measurement head which analyzes the light scattered by the object into three directions to determine the three-dimensional object motion. The measurement spot size is less than 4 µm. Optical crosstalk between the analysis directions is avoided by using only a single laser beam for measurement. [ABSTRACT FROM AUTHOR]

Published
2013
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3. Dynamics of the MnAs α/β-Striped Microstructure and of the Fe Magnetization Reversal in Fe/MnAs/GaAs(001): An Optical-Laser Pump–Free-Electron-Laser Probe Scattering Experiment

Author

Alessandra Ciavardini, Eugenio Ferrari, Lorenzo Raimondi, Cristian Svetina, Lounès Lounis, Enrico Allaria, Mahmoud Eddrief, Carlo Spezzani, Miltcho B. Danailov, Maya Kiskinova, Flavio Capotondi, Emanuele Pedersoli, Renaud Delaunay, R. Ivanov, Ivaylo Nikolov, Maurizio Sacchi, Horia Popescu, Alexander Demidovich, Giovanni De Ninno, Marco Zangrando, Franck Vidal, Y. Zheng, Croissance et propriétés de systèmes hybrides en couches minces (INSP-E8), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL), Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Elettra Sincrotrone Trieste, Laboratoire de Chimie Physique - Matière et Rayonnement (LCPMR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Pierre et Marie Curie - Paris 6 (UPMC), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Synchrotron ELETTRA, CNR Istituto Officina dei Materiali (IOM), Consiglio Nazionale delle Ricerche [Roma] (CNR), Croissance et propriétés de systèmes hybrides en couches minces ( INSP-E8 ), Institut des Nanosciences de Paris ( INSP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), PSL Research University ( PSL ), Laboratoire de Physique des Solides ( LPS ), Université Paris-Sud - Paris 11 ( UP11 ) -Centre National de la Recherche Scientifique ( CNRS ), ELETTRA Sincrotrone Trieste, Laboratoire de Chimie Physique - Matière et Rayonnement ( LCPMR ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Synchrotron SOLEIL ( SSOLEIL ), Centre National de la Recherche Scientifique ( CNRS ), CNR - Istituto Officina dei Materiali ( IOM ), Consiglio Nazionale delle Ricerche [Roma] ( CNR ), Elettra, Sincrotrone Trieste, 34012 Basovizza, Trieste, Italy ( ELETTRA ), Elettra-synchrotron, Elettra Sincrotrone Trieste SCpa, I-34149 Trieste, Italy, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), and National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)

Subjects
Diffraction, Pump-probe experiments, Materials science, 02 engineering and technology, Laser pumping, 01 natural sciences, Overlayer, law.invention, Magnetization, Condensed Matter::Materials Science, law, 0103 physical sciences, Radiology, Nuclear Medicine and imaging, 010306 general physics, Instrumentation, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], Magnetization dynamics, [ PHYS ] Physics [physics], Condensed matter physics, Scattering, free electron laser, pump-probe experiments, magnetization dynamics, microstructure dynamics, Microstructure dynamics, 021001 nanoscience & nanotechnology, Laser, Atomic and Molecular Physics, and Optics, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Free electron laser, Ultrashort pulse
Abstract

It was shown recently that the Fe magnetization reversal in the Fe/MnAs/GaAs(001) epitaxial system, attained by temperature control of the regular stripe pattern of the MnAs ?- and ?-phases, can also be driven by an ultrashort optical laser pulse. In the present time-resolved scattering experiment, we address the dynamics of the MnAs ?/? self-organized stripe pattern induced by a 100 fs optical laser pulse, using as a probe the XUV radiation from the FERMI free-electron laser. We observe a loss in the diffraction intensity from the ordered ?/? stripes that occurs at two characteristic timescales in the range of ~10-12 and ~10-10 s. We associate the first intensity drop with ultrafast electron-lattice energy exchange processes within the laser-MnAs interaction volume and the second with thermal diffusion towards the MnAs/GaAs interface. With the support of model calculations, the observed dynamics are interpreted in terms of the formation of a laterally homogeneous MnAs overlayer, the thickness of which evolves in time, correlating the MnAs microstructure dynamics with the Fe magnetization response.

Published
2017
Full Text
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4. Dynamics of the MnAs alpha/beta-Striped Microstructure and of the Fe Magnetization Reversal in Fe/MnAs/GaAs(001): An Optical-Laser Pump-Free-Electron-Laser Probe Scattering Experiment

Author

Vidal, Franck, Lounis, Lounes, Spezzani, Carlo, Ferrari, Eugenio, Delaunay, Renaud, Ciavardini, Alessandra, Popescu, Horia, Eddrief, Mahmoud, Zheng, Yunlin, Capotondi, Flavio, Pedersoli, Emanuele, Svetina, Cristian, Raimondi, Lorenzo, Zangrando, Marco, Ivanov, Rosen, Nikolov, Ivaylo, Demidovich, Alexander, Danailov, Miltcho B., De Ninno, Giovanni, Allaria, Enrico, Kiskinova, Maya, and Sacchi, Maurizio

Subjects
Condensed Matter::Materials Science, microstructure dynamics, pump-probe experiments, magnetization dynamics, free electron laser
Abstract

It was shown recently that the Fe magnetization reversal in the Fe/MnAs/GaAs(001) epitaxial system, attained by temperature control of the regular stripe pattern of the MnAs alpha- and beta-phases, can also be driven by an ultrashort optical laser pulse. In the present time-resolved scattering experiment, we address the dynamics of the MnAs alpha-beta self-organized stripe pattern induced by a 100 fs optical laser pulse, using as a probe the XUV radiation from the FERMI free-electron laser. We observe a loss in the diffraction intensity from the ordered alpha-beta stripes that occurs at two characteristic timescales in the range of similar to 10(-12) and similar to 10(-10) s. We associate the first intensity drop with ultrafast electron-lattice energy exchange processes within the laser-MnAs interaction volume and the second with thermal diffusion towards the MnAs/GaAs interface. With the support of model calculations, the observed dynamics are interpreted in terms of the formation of a laterally homogeneous MnAs overlayer, the thickness of which evolves in time, correlating the MnAs microstructure dynamics with the Fe magnetization response.

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