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Using a magneto-optical pump-probe technique with micrometer spatialresolution we show that magnetization precession can be launched in individualmagnetic domains imprinted in a Co$_{40}$Fe$_{40}$B$_{20}$ (CoFeB) layer byelastic coupling to ferroelectric domains in a BaTiO$_{3}$ substrate. Thedependence of the precession parameters on external magnetic field strength andorientation reveal that by laser-induced ultrafast partial quenching of themagnetoelastic coupling parameter of CoFeB by $\approx$27% along with 10%ultrafast demagnetization trigger the magnetization precession. The relationbetween the laser-induced reduction of the magnetoelastic coupling and thedemagnetization is approximated by the $n(n+1)/2$-law with n$\approx$2. Thiscorrespondence confirms the thermal origin of the laser-induced anisotropychange. Based on the analysis and modeling of the excited precession we findsignatures of laser-induced precessional switching, which occurs when themagnetic field is applied along the hard magnetization axis and its value isclose to the effective magnetoelastic anisotropy field. The precessionexcitation process in an individual magnetoelastic domain is found to beunaffected by neighboring domains. This makes laser-induced changes ofmagnetoelastic anisotropy a promising tool for driving magnetization dynamicsand switching in composite multiferroics with spatial selectivity.

Laser-induced magnetization precession in individual magnetoelastic domains of a multiferroic CoFeB/BaTiO$_3$ composite