Improvement of high efficiency spin-resolved photoelectron spectroscopy and 3-dimensional spin analysis of materials for spintronics

自旋自由是电子最重要的方面之一。通过研究固体中电子的能量、动量和自旋，可以了解材料的磁性以及由自旋-轨道相互作用引起的与自旋相关的新现象。最流行的自旋探测器是所谓的莫特探测器，目前在世界各地都在使用。然而，自旋探测的效率很低。最近，我们开发了一种新的自旋探测器，称为VLEED自旋探测器，它的效率是Mott探测器的100倍。在这项研究中，我们使用了两个VLEED探测器，并能够研究自旋矢量的方向以及它的自旋极化。由于效率高，在自旋分辨光电子能谱中实现了10(5)倍的能量(角)分辨率。这项研究为非常精确地研究用于下一代自旋电子器件的材料的自旋性质开辟了一条途径。

Spin freedom is one of the most important aspect of electrons. Magnetic properties of materials and a new spin related phenomena caused by spin-orbit interaction can be understood by investigating the energy, momentum and spin of electron in solids.To investigate electron spin one needs spin detector. Most popular spin detector is so-called Mott detector that is used all over the world so far. However, the efficiency of spin detection is very low. Recently we have developed a new spin detector called VLEED spin detector that has 100 times higher efficiency than the Mott detector. In this study we utilised two VLEED detectors and enabled to investigate the direction of spin vector as well as its spin polarization. Because of the high efficiency, 10 (5) times higher energy (angular) resolution in spin-resolved photoemission has been realised. This study opens a pathway to investigate spin properties of materials for the next generation spintronics devices very precisely.