Ultrafast acoustics for magnetization modulation (B06)

相干声子通过弹性调制铁磁体的磁晶各向异性，是纳米尺度磁化进动的有效启动器。在这里，我们将使用超快声学来实现相干磁-声子相互作用。我们将把诸如Galfenol自旋阀中的自旋泵浦等磁振子-声子耦合效应的频率扩展到太赫兹，并利用垂直和横向谐振器激发特定的磁振子模，旨在演示声子-磁振子转换。在铁磁性(Ga，Mn)(As，P)薄膜中，我们将实现应变诱导的磁化重定向。我们还计划将超快磁声学扩展到反铁磁材料。

Coherent phonons are an effective launcher of magnetization precession at the nanoscale by elastic modulation of the magnetocrystalline anisotropy of a ferromagnet. Here we will use ultrafast acoustics for coherent magneto-phonon interactions. We will extend the frequencies of magnon-phonon coupling effects such as spin-pumping in a Galfenol spin valve up to THz and excite specific magnon modes using vertical and lateral resonators, aiming at demonstrating phonon-magnon conversion. In ferromagnetic (Ga,Mn)(As,P) films we will realize a strain-induced reorientation of magnetization. We also plan to extend ultrafast magneto-acoustics to antiferromagnetic materials.