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Based on micromagnetic simulations and experimental observations of themagnetization and lattice dynamics following the direct optical excitation ofthe magnetic insulator Bi:YIG or indirect excitation via an optically opaquePt/Cu double layer, we disentangle the dynamical effects of magnetic anisotropyand magnetoelastic coupling. The strain and temperature of the lattice arequantified via modeling ultrafast x-ray diffraction data. Measurements of thetime-resolved magneto-optical Kerr effect agree well with the magnetizationdynamics simulated according to the excitation via two mechanisms: Themagneto-acoustic coupling to the experimentally verified strain dynamics andthe ultrafast temperature-induced transient change in the magnetic anisotropy.The numerical modeling proves that for direct excitation both mechanisms drivethe fundamental mode with opposite phase. The relative ratio of standingspin-wave amplitudes of higher order modes indicates that both mechanisms aresubstantially active.

Standing spin wave excitation in Bi:YIG films via temperature induced anisotropy changes and magnetoacoustic coupling