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In this Article we discuss a micromagnetic modelling approach to describe theultrafast spin-transfer torque excitation of coherent and incoherent magnons onthe nanoscale. Implementing the action of a femtosecond spin current pulseentering an orthogonally magnetized thin ferromagnetic film, we reproducerecent experimental results and reveal the factors responsible for the unequalexcitation efficiency of various spin waves. Our findings are in an excellentagreement with the results of an analytical description of spin-wave excitationbased on classical kinetic equations. Furthermore, we suggest an experimentaldesign allowing for the excitation of laterally propagating spin waves beyondthe optical diffraction limit. Our findings demonstrate that the classicalmicromagnetic picture retains its predictive and interpretative power onfemtosecond temporal and nanometer spatial scales.

Micromagnetic view on ultrafast magnon generation by femtosecond spin current pulses