Using a magneto-optical pump-probe technique with micrometer spatial resolution, we show that magnetization precession can be launched in individual magnetic domains imprinted in a ${\mathrm{Co}}_{40}{\mathrm{Fe}}_{40}{\mathrm{B}}_{20}$ layer by elastic coupling to ferroelectric domains in a ${\mathrm{Ba}\mathrm{Ti}\mathrm{O}}_3$ substrate. The dependence of the precession parameters on the strength and orientation of the external magnetic field reveals that laser-induced ultrafast partial quenching of the magnetoelastic coupling parameter of ${\mathrm{Co}}_{40}{\mathrm{Fe}}_{40}{\mathrm{B}}_{20}$ by approximately 27% along with 10% ultrafast demagnetization triggers the magnetization precession. The relation between the laser-induced reduction of the magnetoelastic coupling and the demagnetization is approximated by an $n(n+1)/2$ law with $n\approx 2$. This correspondence confirms the thermal origin of the laser-induced anisotropy change. Based on analysis and modeling of the excited precession, we find signatures of laser-induced precessional switching, which occurs when the magnetic field is applied along the hard magnetization axis and its value is close to the effective magnetoelastic anisotropy field. The precession-excitation process in an individual magnetoelastic domain is found to be unaffected by neighboring domains. This makes laser-induced changes of magnetoelastic anisotropy a promising tool for driving magnetization dynamics and switching in composite multiferroics with spatial selectivity.

中文翻译：

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多铁性Co40Fe40B20 / BaTiO3复合材料在单个磁弹性域中的激光诱导磁化进动

使用具有微米级空间分辨率的磁光泵浦探针技术，我们证明了磁化进动可以在刻印在磁芯中的各个磁畴中启动。 ${\mathrm{有限公司}}_{40}{铁}_{40}{\mathrm{乙}}_{20}$ 层通过弹性耦合到铁电畴 ${巴钛\mathrm{Ø}}_3$基质。进动参数对外部磁场的强度和方向的依赖性表明，激光诱导的超快局部淬火的磁弹性耦合参数${\mathrm{有限公司}}_{40}{铁}_{40}{\mathrm{乙}}_{20}$大约27％的磁场以及10％的超快退磁会触发磁化进动。激光诱导的磁弹性耦合的减少与退磁之间的关系由下式近似：$ñ（ñ+\mathrm{1个}）/2$ 与法律 $ñ\approx 2$。这种对应关系证实了激光引起的各向异性变化的热起源。在对激发进动的分析和建模的基础上，我们发现了激光诱发的进动切换的特征，当沿硬磁化轴施加磁场并且其值接近有效磁弹性各向异性场时，就会发生这种信号。发现在单个磁弹性域中的进动-激发过程不受相邻域的影响。这使得激光诱导的磁弹性各向异性变化成为一种有前途的工具，可用于驱动磁化动力学并切换具有空间选择性的复合多铁。