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Single shot ultrafast all optical magnetization switching of ferromagnetic Co/Pt multilayers

Abstract : A single femto-second optical pulse can fully reverse the magnetization of a film within picosec-onds. Such fast operation hugely increases therange of application of magnetic devices.However, so far, this type of ultrafast switchinghas been restricted to ferri-magnetic GdFeCofilms. In contrast, all optical switching of ferro-magnetic films require multiple pulses, therebybeing slower and less energy efficient. Here, wedemonstrate magnetization switching induced bya single laser pulse in various ferromagnetic Co/Pt multilayers grown on GdFeCo, by exploitingthe exchange coupling between the two magnetic films. Table-top depth-sensitive time-resolvedmagneto-optical experiments show that the Co/Pt magnetization switches within 7 ps. This cou-pling approach will allow ultrafast control of avariety of magnetic films, which is critical forapplications.
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J. Gorchon, Charles-Henri Lambert, Yang Yang, Akshay Pattabi, Richard Wilson, et al.. Single shot ultrafast all optical magnetization switching of ferromagnetic Co/Pt multilayers. Applied Physics Letters, American Institute of Physics, 2017, 111, ⟨10.1063/1.4994802⟩. ⟨hal-02388427⟩



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