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All-optical magnetization reversal by circularly-polarized laser pulses : Experiment and multiscale modeling

All-optical magnetization reversal by circularly-polarized laser pulses : Experiment and multiscale modeling

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VAHAPLAR, Kadir, Alexandra KALASHNIKOVA, Alexey KIMEL, Stefan GERLACH, Denise HINZKE, Ulrich NOWAK, Roy CHANTRELL, Arata TSUKAMOTO, A. ITOH, Andrei KIRILYUK, Theo RASING, 2012. All-optical magnetization reversal by circularly-polarized laser pulses : Experiment and multiscale modeling. In: Physical Review B. 85(10). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.85.104402

@article{Vahaplar2012Allop-18777, title={All-optical magnetization reversal by circularly-polarized laser pulses : Experiment and multiscale modeling}, year={2012}, doi={10.1103/PhysRevB.85.104402}, number={10}, volume={85}, issn={1098-0121}, journal={Physical Review B}, author={Vahaplar, Kadir and Kalashnikova, Alexandra and Kimel, Alexey and Gerlach, Stefan and Hinzke, Denise and Nowak, Ulrich and Chantrell, Roy and Tsukamoto, Arata and Itoh, A. and Kirilyuk, Andrei and Rasing, Theo} }

Kalashnikova, Alexandra Kimel, Alexey Itoh, A. Kirilyuk, Andrei Chantrell, Roy Gerlach, Stefan 2012 Kirilyuk, Andrei Nowak, Ulrich Kalashnikova, Alexandra Rasing, Theo Tsukamoto, Arata Hinzke, Denise Tsukamoto, Arata eng First publ. in: Physical Review B ; 85 (2012), 10. - 104402 Rasing, Theo Kimel, Alexey 2012-03-29T08:34:07Z We present results of detailed experimental and theoretical studies of all-optical magnetization reversal by single circularly-polarized laser pulses in ferrimagnetic rare earth—transition metal (RE–TM) alloys GdxFe90−xCo10 (20%<x<28%). Using single-shot time-resolved magneto-optical microscopy and multiscale simulations, we identified and described the unconventional path followed by the magnetization during the reversal process. This reversal does not involve precessional motion of magnetization but is governed by the longitudinal relaxation and thus has a linear character. We demonstrate that this all-optically driven linear reversal can be modeled as a result of a two-fold impact of the laser pulse on the medium. First, due to absorption of the light and ultrafast laser-induced heating, the medium is brought to a highly nonequilibrium state. Simultaneously, due to the ultrafast inverse Faraday effect the circularly polarized laser pulse acts as an effective magnetic field of the amplitude up to ∼20 T. We show that the polarization-dependent reversal triggered by the circularly polarized light is feasible only in a narrow range (below 10%) of laser fluences. The duration of the laser pulse required for the reversal can be varied from ∼40 fs up to at least ∼1700 fs. We also investigate experimentally the role of the ferrimagnetic properties of GdFeCo in the all-optical reversal. In particular, the optimal conditions for the all-optical reversal are achieved just below the ferrimagnetic compensation temperature, where the magnetic information can be all-optically written by a laser pulse of minimal fluence and read out within just 30 ps. We argue that this is the fastest write-read event demonstrated for magnetic recording so far. Vahaplar, Kadir All-optical magnetization reversal by circularly-polarized laser pulses : Experiment and multiscale modeling deposit-license Gerlach, Stefan Nowak, Ulrich 2012-03-29T08:34:07Z Hinzke, Denise Itoh, A. Vahaplar, Kadir Chantrell, Roy

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