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25 April 2024

» arxiv » 1412.0396

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All-optical magnetization switching in ferrimagnetic alloys: deterministic vs thermally activated dynamics
L. Le Guyader ; S. El Moussaoui ; M. Buzzi ; M. Savoini ; A. Tsukamoto ; A. Itoh ; A. Kirilyuk ; Th. Rasing ; F. Nolting ; A. V. Kimel ;
Date:	1 Dec 2014
Abstract:	Using photo-emission electron microscopy with X-ray magnetic circular dichroism as a contrast mechanism, new insights into the all-optical magnetization switching (AOS) phenomenon in GdFe based rare-earth transition metal ferrimagnetic alloys are provided. From a sequence of static images taken after single linearly polarized laser pulse excitation, the repeatability of AOS can be measured with a correlation coefficient. It is found that low coercivity enables thermally activated domain wall motion, limiting in turn the repeatability of the switching. Time-resolved measurement of the magnetization dynamics reveal that while AOS occurs below and above the magnetization compensation temperature $T_ ext{M}$, it is not observed in GdFe samples where $T_ ext{M}$ is absent. Finally, AOS is experimentally demonstrated against an applied magnetic field of up to 180 mT.
Source:	arXiv, 1412.0396
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