Interface between superconductor and magnetic skyrmions studies by spin-polarized STM

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K15166
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 29020:Thin film/surface and interfacial physical properties-related
• Research Institution: The University of Tokyo
• Principal Investigator: Haze Masahiro 東京大学, 物性研究所, 助教 (50805869)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Keywords: 走査トンネル顕微鏡 / 超伝導 / 磁性

Outline of Final Research Achievements

The purpose of this study is to make an interface between magnetic and superconducting materials and to detect exotic phenomena by scanning tunneling microscopy (STM). In this study we fabricated ferromagnetic CrBr3 thin films on the superconducting NbSe2 substrate by molecular beam epitaxy.
Atomically resolved images and Moire patterns are observed by STM. Local modulation of electronic states are also observed, which is likely due to the local moderation of magnetic properties. In addition, we observed that superconducting properties are locally modulated on the edge of CrBr3 island structures.

Free Research Field

表面物性

Academic Significance and Societal Importance of the Research Achievements

本研究は、通常競合する超伝導特性と磁気特性を、それらの物性を持つ2つの物質を人工的に接合させたときにどのような現象が飽きるかは物性物理の重要課題の一つである。これまで理論的にその界面におけるMajorana粒子の存在など新規物性が予測されていたもののその現象の存在に対して確たる証拠はなかったが、本研究は、確たる証拠とはいえないまでも、超伝導体と磁性体の界面において新奇現象が起きていることを支持する結果となり、物性物理の重要課題に取り組む非常な重要な成果である。