Two types of all-optical magnetization switching mechanisms using femtosecond laser pulses

Abstract : Using a time-dependent electrical investigation of the all-optical switching in ferrimagnetic and ferromagnetic Hall crosses via the anomalous Hall effect, intriguing insights into the rich physics underlying the all-optical switching are provided. We demonstrate that two different all-optical magnetization switching mechanisms can be distinguished; a " single pulse " switching for ferrimagnetic GdFeCo alloys, and a " two regimes " switching process for both ferrimagnetic TbCo alloys and ferromagnetic Pt/Co multilayers. We show that the latter takes place at two different time scales, and consists of a steplike helicity-independent multiple-domain formation within the first 1 ms followed by a helicity-dependent remagnetization on several tens of milliseconds.
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Submitted on : Friday, October 14, 2016 - 11:05:08 AM
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Mohammed Salah El Hadri, Philipp Pirro, Charles-Henri Lambert, Sébastien Petit-Watelot, Yassine Quessab, et al.. Two types of all-optical magnetization switching mechanisms using femtosecond laser pulses. Physical Review B : Condensed matter and materials physics, American Physical Society, 2016, 94 (6), pp.064412. ⟨10.1103/PhysRevB.94.064412⟩. ⟨hal-01381232⟩

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