Development of RHEED apparatus using spin-polarized electron source for the study of surface and interface magnetism.

在本研究中，我们利用自旋极化电子源研制了一种新型反射高能电子衍射仪，用于研究非磁性金属的磁性金属超晶格的界面结构。基于负电子亲和活化（NET）等新原理，利用砷化镓表面发射的电子进行自旋极化电子源。主要成果如下：(1)利用名古屋大学应用物理系车间自制了自旋极化电子源。(2)电子源（电子枪）工作在10^<-11> Torr的特高压条件下。作为合作工作，应变的砷化镓晶体由大户特钢公司提供。将砷化镓晶体固定在电子灯丝的普通位置，用直流馈电加热清洗表面。极化电子的发射需要吸附有Cs原子的GaAs表面，因此Cs的蒸发源位于GaAs晶体附近。从荧光屏中心的小孔引入激光激活砷化镓表面的净效应。

In the present study, we investigated new type of Reflection high-energy electron diffraction apparatus using spin-polarized electron source to study the interfacial structures of non-magnetic metal magnetic metal superlattices. The spin-polarized electron source is used of electrons emitted from GaAs surfaces based on the new principle such as the negative electron affinity activation (NET).Main achievements are as followS :(1) We made a spin-polarized electron source by ourselves using the workshop of the Department of Applied Physics of Nagoya University.(2) The electron source (electron gun) is working at an UHV condition of 10^<-11> Torr. The strained GaAs crystals were supplied from the Daido Special Steel Co.as the collaboration work.The GaAs crystal was fixed at the ordinary position of electron filament and the surfaces was cleaned by heating by the direct current feed.The emission of polarized electrons needs the GaAs surface adsorbed with Cs atoms, and so the evaporation source of Cs is located near the GaAs crystals.Laser-light for activation NET effect on GaAs Surfaces was introduced from a small hole at the center of fluorescent screen.