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Spin Detection with Positron and Positronium
https://repo.qst.go.jp/records/73329
https://repo.qst.go.jp/records/73329ba510958-28e9-460e-a0d8-e38dd247f33e
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-08-13 | |||||
| タイトル | ||||||
| タイトル | Spin Detection with Positron and Positronium | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
河裾, 厚男
× 河裾, 厚男× 萩原, 聡× 宮下, 敦巳× 前川, 雅樹× 和田, 健× 河裾 厚男× 萩原 聡× 宮下 敦巳× 前川 雅樹× 和田 健 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | After the discovery of parity non-conservation in the weak interaction, using angular correlation of annihilation radiation technique, the investigation of ferromagnetic band structures had been started in 1950’s. In 1979, the role of spin-polarized positron spectroscopy was again paid the attention due to the invention of spin-polarized ‘slow’ positron beam by the Michigan group. In 1982, they found that Ni surface is in magnetically ‘live’ layer against the dead layer hypothesis. This demonstrated the superiority of spin-polarized slow positron beam in the study of surface magnetism. Recently, towards the innovation of electronic devices by using electron charge and spin together, so-called spintronics research is brisk. Currently, half-metals that have ideally 100 % spin polarization at the Fermi level, and magnetic semiconductors in which the magnetism is controllable using electric field and light are extensively investigated. The further intriguing phenomena and materials, such as the spin-Hall effect, the Rashba effect, topological insulators and graphene-related monoatomic layer materials are also explored enthusiastically. In light of this, the role of spin-polarized positron spectroscopy is important. In this talk, we introduce our research and development of spin-polarized positron beams using 22Na and 68Ge. As the applications, we present the recent results on (i) the spin polarizations of single-layer graphene and h-BN induced by the magnetic proximity effect from Co(0001) and Ni(111) and (ii) the electron spins localized at atomic vacancies in ZnO and GaN. We will also discuss some fundamental aspects of the surface positronium annihilation spectroscopy that will provide new information about spin-polarized surface electronic states. |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 18th International Conference on Positron Annihilation (ICPA-18) | |||||
| 発表年月日 | ||||||
| 日付 | 2018-08-21 | |||||
| 日付タイプ | Issued | |||||
