Micromagnetic view on ultrafast magnon generation by femtosecond spin current pulses

Abstract

In this Article we discuss a micromagnetic modelling approach to describe the ultrafast spin-transfer torque excitation of coherent and incoherent magnons on the nanoscale. Implementing the action of a femtosecond spin current pulse entering an orthogonally magnetized thin ferromagnetic film, we reproduce recent experimental results and reveal the factors responsible for the unequal excitation efficiency of various spin waves. Our findings are in an excellent agreement with the results of an analytical description of spin-wave excitation based on classical kinetic equations. Furthermore, we suggest an experimental design allowing for the excitation of laterally propagating spin waves beyond the optical diffraction limit. Our findings demonstrate that the classical micromagnetic picture retains its predictive and interpretative power on femtosecond temporal and nanometer spatial scales.

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Cited by in corpus (7)

• Probing optical spin-currents using THz spin-waves in noncollinear magnetic bilayers
• High-frequency magnon excitation due to femtosecond spin-transfer torques
• Nonreciprocal spin-wave dispersion in magnetic bilayers
• Effective exchange interaction for terahertz spin waves in iron layers
• Quantum-classical approach to spin and charge pumping and the ensuing radiation in THz spintronics: Example of ultrafast-light-driven Weyl antiferromagnet Mn${}_3$Sn
• Theory of superdiffusive spin transport in noncollinear magnetic multilayers
• Optically induced magnetic inertia and magnons from non-Markovian extension of the Landau-Lifshitz-Gilbert equation