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12 May 2015 Optically induced Fe magnetization reversal in Fe/MnAs/GaAs(001)
C. Spezzani, E. Ferrari, E. Allaria, F. Vidal, L. Lounis, A. Ciavardini, R. Delaunay, F. Capotondi, E. Pedersoli, M. Coreno, C. Svetina, L. Raimondi, M. Zangrando, R. Ivanov, I. Nikolov, A. Demidovich, M. Danailov, G. De Ninno, H. Popescu, M. Eddrief, M. Kiskinova, M. Sacchi
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Proceedings Volume 9512, Advances in X-ray Free-Electron Lasers Instrumentation III; 95120I (2015) https://doi.org/10.1117/12.2184710
Event: SPIE Optics + Optoelectronics, 2015, Prague, Czech Republic
Abstract
Magnetization control without applying magnetic fields has potential for applications in sensors and devices. In Fe/MnAs/GaAs(001), the Fe magnetization can be modified by acting on the MnAs microstructure via temperature control, without applying external magnetic fields. Here we use an optical laser pulse to vary the local temperature and an x-ray free-electron laser pulse to probe the induced magnetic and structural dynamics in a time-resolved resonant scattering experiment, both pulses having ~100 fs duration. Modifications of the MnAs microstructure take place within a few ps, followed by a slower dynamics driven by thermal diffusion. We show that a single optical laser pulse can reverse the Fe magnetization locally, the process being driven not by the fast modifications of the MnAs structure, but rather by its slower return to equilibrium.
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C. Spezzani, E. Ferrari, E. Allaria, F. Vidal, L. Lounis, A. Ciavardini, R. Delaunay, F. Capotondi, E. Pedersoli, M. Coreno, C. Svetina, L. Raimondi, M. Zangrando, R. Ivanov, I. Nikolov, A. Demidovich, M. Danailov, G. De Ninno, H. Popescu, M. Eddrief, M. Kiskinova, and M. Sacchi "Optically induced Fe magnetization reversal in Fe/MnAs/GaAs(001)", Proc. SPIE 9512, Advances in X-ray Free-Electron Lasers Instrumentation III, 95120I (12 May 2015); https://doi.org/10.1117/12.2184710
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KEYWORDS
Iron
Pulsed laser operation
Picosecond phenomena
Magnetism
Free electron lasers
Laser optics
Laser scattering
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