Charge pumping driven by the laser-induced dynamics of the exchange splitting

Abstract

We show that electric currents are induced in inversion asymmetric ferromagnets if the exchange splitting varies in time after excitation by laser pulses. We interpret this phenomenon as the magnetic variant of the inverse Edelstein effect. Based on \textit{ab initio} calculations we determine the size of this effect in Co/Pt(111) and Mn/W(001) magnetic bilayer systems and investigate its dependence on the magnetization direction. The comparison of our theoretical results to experiments measuring the THz signal emitted after laser excitation suggests that ultrafast demagnetization in 3$d$ transition metal ferromagnets is dominated by transverse spin fluctuations rather than by a reduction of the exchange splitting.

References in corpus (8)

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Cited by in corpus (8)

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• Dynamical and current-induced Dzyaloshinskii-Moriya interaction: Role for damping, gyromagnetism, and current-induced torques in noncollinear magnets
• Manifestation of intra-atomic 5d6s-4f exchange coupling in photoexcited gadolinium
• Interface enhanced helicity dependent photocurrent in metal/semimetal bilayers
• Laser-induced torques in spin spirals
• Orbital torques and orbital pumping in two-dimensional rare-earth dichalcogenides