Laraoui A, Albrecht M, Bigot J-Y
Institut de Physique et Chimie des Matériaux de Strasbourg, Université Louis Pasteur, Strasbourg, France.
Opt Lett. 2007 Apr 15;32(8):936-8. doi: 10.1364/ol.32.000936.
We have developed a magneto-optical Kerr microscope that allows us to measure the ultrafast magnetization dynamics of ferromagnetic nanostructures. The magneto-optical signal can be recorded in a confocal reflection geometry with an accurate selection of the polarization. The magnetization dynamics is obtained from pump-probe measurements using frequency nondegenerate collinear pump and probe beams with a temporal resolution of 180 fs. Both probe and pump beams are focused to their diffraction limit, leading to an overall spatial resolution of 600 nm. The efficiency of the apparatus is tested by investigating the magnetization dynamics of individual CoPt(3) disks with a submicrometer diameter and a thickness of 15 nm.
我们开发了一种磁光克尔显微镜，它使我们能够测量铁磁纳米结构的超快磁化动力学。磁光信号可以在共焦反射几何结构中记录，并精确选择偏振。磁化动力学是通过泵浦-探测测量获得的，使用频率非简并共线泵浦和探测光束，时间分辨率为180飞秒。探测光束和泵浦光束都聚焦到它们的衍射极限，从而得到600纳米的整体空间分辨率。通过研究直径为亚微米、厚度为15纳米的单个CoPt(3)盘的磁化动力学来测试该装置的效率。
