Hot-Electron-Induced Ultrafast Demagnetization in Co / Pt Multilayers

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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N. Bergeard, M. Hehn, Stéphane Mangin, G. Lengaigne, F. Montaigne, et al.. Hot-Electron-Induced Ultrafast Demagnetization in Co / Pt Multilayers. Physical Review Letters, American Physical Society, 2016, 117 (14), pp.147203. ⟨10.1103/PhysRevLett.117.147203⟩. ⟨hal-01599013⟩

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