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. Author manuscript; available in PMC: 2017 Sep 6.
Published in final edited form as: Rev Mod Phys. 2017 Jun 5;89(2):025006. doi: 10.1103/RevModPhys.89.025006

Figure 27.

Figure 27

Schematics of experiments showing superdiffusive spin currents. (a) Demagnetization of Fe film by an ultrashort pump pulse injects spin current into adjacent Au layer with its arrival at the Au backside detected by time-resolved magnetic second harmonic generation, discussed in [Melnikov et al., 2011]. (b) Femtosecond demagnetization of the bottom ferromagnetic layer with perpendicular magnetic anisotropy results in spin-torque-induced precession dynamics in the top ferromagnetic layer driven by superdiffusive spin currents, discussed in [Schellekens et al., 2014; Choi et al., 2014]. (c) Optical pumping heterostructures where femtosecond demagnetization of the bottom Co/Pt multilayer affects demagnetization of the top Co/Pt multilayer for metallic (Ru) but not for insulating (NiO) spacer layers, discussed in [Malinowski et al., 2008]; demagnetization also depends on the relative orientation of the two magnetic layers.