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

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2012
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Vahaplar, Kadir
Kalashnikova, Alexandra
Kimel, Alexey
Chantrell, Roy
Tsukamoto, Arata
Itoh, A.
Kirilyuk, Andrei
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Physical Review B. 2012, 85(10). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.85.104402
Zusammenfassung

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.

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530 Physik
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optical magnetization reversal, circularly polarized, laser pulses, multiscale modeling
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ISO 690VAHAPLAR, 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. 2012, 85(10). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.85.104402
BibTex
@article{Vahaplar2012Allop-18777,
  year={2012},
  doi={10.1103/PhysRevB.85.104402},
  title={All-optical magnetization reversal by circularly-polarized laser pulses : Experiment and multiscale modeling},
  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}
}
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    <dcterms:abstract xml:lang="eng">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%&lt;x&lt;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.</dcterms:abstract>
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