Spin-polarized positron beam study of surface spin polarization

スピン偏極陽電子ビームによる最表面電子スピン偏極の研究

Zhang, H.; 山本 春也; Li, H.; 前川 雅樹; 深谷 有喜   ; 河裾 厚男; 関 剛斎*; 齊藤 英治*; 高梨 弘毅*

Zhang, H.; Yamamoto, Shunya; Li, H.; Maekawa, Masaki; Fukaya, Yuki; Kawasuso, Atsuo; Seki, Takeshi*; Saito, Eiji*; Takanashi, Koki*

Some important magnetic effects, such as giant magnetoresistance and tunneling magnetoresistance, occur near the interface between magnetic and nonmagnetic layers. Spin-injection electrodes, which will be used in spin devices, are normally thin films. Spin phenomena such as the spin Hall effect and the giant Rashba effect occur near surfaces. These are potential applications of spin-polarized positron beam. In this presentation, we introduce our research and development of highly spin-polarized positron beam using a Ge-Ga source in addition to conventional Na sources and their applications to the band structures of classical and new ferromagnets including Heusler alloys, the surface ferromagnetism, and current-induced spin polarization on some non-magnetic metal surfaces.