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

本研究利用新型的反射式高能电子衍射装置，利用自旋极化电子源，研究了非磁性金属磁性金属超晶格的界面结构。自旋极化电子源是利用负电子亲和势激活（NET）等新原理从GaAs表面发射电子的一种电子源，主要研究成果如下：（1）利用名古屋大学应用物理系的研究室自行研制了自旋极化电子源。(2)电子源（电子枪）在10^ Torr的UHV条件下工作<-11>。应变GaAs晶体由大同特殊钢公司提供。GaAs晶体被固定在电子丝的普通位置，通过直流馈电加热表面清洁。极化电子的发射需要GaAs表面吸附Cs原子，因此Cs的蒸发源位于GaAs晶体附近。激活GaAs表面的NET效应的激光从荧光屏中心的小孔引入。Co.as

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.