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Photonics 2017, 4(2), 21; doi:10.3390/photonics4020021

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

1
Institut des NanoSciences de Paris, Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7588, 75005 Paris, France
2
Ecole Normale Supérieure, PSL Research University, 75231 Paris, France
3
ELETTRA—Sincrotrone Trieste, Area Science Park, 34149 Trieste, Italy
4
Laboratoire de Physique des Solides, Université Paris-Sud, CNRS-UMR 8502, Bât. 510, 91405 Orsay, France
5
Dipartimento di Fisica, Università degli Studi di Trieste, 34127 Trieste, Italy
6
Laboratoire de Chimie Physique Matière et Rayonnement, Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7614, 75005 Paris, France
7
Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, B.P. 48, 91192 Gif-sur-Yvette, France
8
Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
9
Laboratory of Quantum Optics, University of Nova Gorica, 5001 Nova Gorica, Slovenia
10
Current Address: Particle Accelerator Physics Laboratory, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
11
Current Address: Swiss Light Source, Paul Scherrer Institute, PSI, 5232 Villigen, Switzerland.
12
Current Address: DESY Photon Science, Notkestr. 85, D-22607 Hamburg, Germany.
*
Author to whom correspondence should be addressed.
Received: 27 January 2017 / Revised: 11 March 2017 / Accepted: 17 March 2017 / Published: 23 March 2017
(This article belongs to the Special Issue Extreme UV Lasers: Technologies and Applications)
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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 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. View Full-Text
Keywords: free electron laser; pump-probe experiments; magnetization dynamics; microstructure dynamics free electron laser; pump-probe experiments; magnetization dynamics; microstructure dynamics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Vidal, F.; Lounis, L.; Spezzani, C.; Ferrari, E.; Delaunay, R.; Ciavardini, A.; Popescu, H.; Eddrief, M.; Zheng, Y.; Capotondi, F.; Pedersoli, E.; Svetina, C.; Raimondi, L.; Zangrando, M.; Ivanov, R.; Nikolov, I.; Demidovich, A.; Danailov, M.B.; De Ninno, G.; Allaria, E.; Kiskinova, M.; Sacchi, M. 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. Photonics 2017, 4, 21.

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