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Hot-Electron-Induced Ultrafast Demagnetization in Co/Pt Multilayers
N Bergeard1, M Hehn1, S Mangin1
1Institut Jean Lamour, CNRS UMR 7198, Universitè de Lorraine, 54506 Vandoeuvre-lès-Nancy, France.
Abstract:
Using specially engineered structures to tailor the optical absorption in a metallic multilayer, we analyze the magnetization dynamics of a Co/Pt multilayer buried below a thick Cu layer. We demonstrate that hot electrons alone can very efficiently induce ultrafast demagnetization. Simulations based on hot electron ballistic transport implemented within a microscopic model that accounts for local dissipation of angular momentum nicely reproduce the experimental results, ruling out contribution of pure thermal transport.
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