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  • Title: Ultrafast path for optical magnetization reversal via a strongly nonequilibrium state.
    Author: Vahaplar K, Kalashnikova AM, Kimel AV, Hinzke D, Nowak U, Chantrell R, Tsukamoto A, Itoh A, Kirilyuk A, Rasing T.
    Journal: Phys Rev Lett; 2009 Sep 11; 103(11):117201. PubMed ID: 19792396.
    Abstract:
    Using time-resolved single-shot pump-probe microscopy we unveil the mechanism and the time scale of all-optical magnetization reversal by a single circularly polarized 100 fs laser pulse. We demonstrate that the reversal has a linear character, i.e., does not involve precession but occurs via a strongly nonequilibrium state. Calculations show that the reversal time which can be achieved via this mechanism is within 10 ps for a 30 nm domain. Using two single subpicosecond laser pulses we demonstrate that for a 5 microm domain the magnetic information can be recorded and readout within 30 ps, which is the fastest "write-read" event demonstrated for magnetic recording so far.
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