Nakagawa Takeshi, Watanabe Kazuya, Matsumoto Yoshiyasu, Yokoyama Toshihiko
Institute for Molecular Science, Myodaiji-cho, Okazaki, Aichi 444-8585, Japan.
J Phys Condens Matter. 2009 Aug 5;21(31):314010. doi: 10.1088/0953-8984/21/31/314010. Epub 2009 Jul 7.
We demonstrate that laser induced valence band photoemission can be used in the observation of magnetic domain structures with a magnetic circular dichroism photoemission electron microscope (MCD-PEEM). It has been widely considered that valence band photoemission MCD asymmetry is rather small compared to that obtained with x-rays because of its weak spin-orbit coupling. However, we show that the MCD asymmetry is high near the photoemission threshold, permitting us to perform MCD-PEEM experiments. The use of intense and pulsed lasers as excitation sources enables PEEM studies of two-photon photoemission MCD and all optical time resolved MCD.
我们证明，激光诱导价带光发射可用于通过磁圆二色性光发射电子显微镜（MCD-PEEM）观察磁畴结构。由于其自旋轨道耦合较弱，人们普遍认为价带光发射的MCD不对称性与X射线相比相当小。然而，我们表明在光发射阈值附近MCD不对称性很高，这使我们能够进行MCD-PEEM实验。使用强脉冲激光作为激发源能够实现对双光子光发射MCD和全光学时间分辨MCD的光发射电子显微镜研究。
