Study on surface magnetic structure by spin-polarized low-energy positron diffraction

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K13692
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: National Institutes for Quantum and Radiological Science and Technology
• Principal Investigator: Wada Ken 国立研究開発法人量子科学技術研究開発機構, 高崎量子応用研究所 先端機能材料研究部, 主幹研究員(定常) (10401209)
• Co-Investigator(Renkei-kenkyūsha): KAWASUSO Atsuo 国立研究開発法人量子科学技術研究開発機構, 高崎量子応用研究所 先端機能材料研究部, 上席研究員 (20354946) ; MAEKAWA Masaki 国立研究開発法人量子科学技術研究開発機構, 高崎量子応用研究所 先端機能材料研究部, 主幹研究員 (10354945) ; SHIRASAWA Tetsuroh 国立研究開発法人産業技術総合研究所, 物質計測標準研究部門, 主任研究員 (80451889)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 表面 / 界面 / 磁性 / 陽電子 / 回折 / 構造解析

Outline of Final Research Achievements

A slow-positron beam apparatus, which uses spin-polarized positrons emitted from a radioisotope, has been developed. By using a solid rare gas moderator for obtaining mono-energetic slow-positrons, it generates a spin-polarized slow-positron beam with a diameter of 0.2 mm (FWHM) at a position for transmission-type remoderator.
A low-energy positron diffraction (LEPD) pattern from a Ge(001)-2x1 structure has been observed with an accelerator-based non-polarized slow-positron beam, whose brightness was enhanced by a transmission-type remoderator and optics we had developed.

Free Research Field

陽電子科学