Laser photoemission magnetic dichroism and PEEM study of magnetic thin films using variable polarization and multi-photon process

我们已经披露了这一点。适当地选择光子的极化和能量，可以大大增强价带的磁圆二色性不对称性。在铁磁性过渡金属的情况下，磁性来自三维电子。从三维电子到共振sp轨道的跃迁可以看到较大的磁二色性，对于双光子光电发射MCD，这种共振跃迁具有较大的磁二色性。利用具有大二色性的光电子显微镜，使我们能够以高灵敏度观察磁畴，并利用脉冲激光揭示磁畴的超快动力学。

We have revealed that. with the proper choice of polarization and energy of photons, the magnetic circular dichroism (MCD) asymmetry in the valence band can be largely enhanced. In case of ferromagnetic transition metals, the magnetism is derived from the 3d electrons. We can see large magnetic dichroism for the transition from 3d electrons to the resonance sp orbital, and for two photon photoemission MCD, this resonance transition gives large dichroism. The use of photo electron microscope with the large dichroism enables us to observe magnetic domains with high sensitivity, and to reveal the ultrafast dynamics of the magnetic domains using pulse lasers.