Development of scanning diamond NV center probe operating in ultra-high vacuum and cryogenic temperatures

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04878
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 29020:Thin film/surface and interfacial physical properties-related
• Research Institution: Japan Advanced Institute of Science and Technology
• Principal Investigator: Hayashi Kunitaka 北陸先端科学技術大学院大学, 先端科学技術研究科, 研究員 (60836857)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: ダイヤモンドNV中心 / 走査プローブ顕微鏡 / 局所磁場計測・イメージング / 超高真空・極低温

Outline of Final Research Achievements

The magnetic structure of magnetic samples was observed at room temperature and in air using an atomic force microscope (AFM) mechanism, an FPGA integrated controller and control program, a transportable scanning diamond NV (nitrogen-vacancy) center probe mechanism that can operate in ultrahigh vacuum and cryogenic conditions, and a transportable sample holder mechanism developed previously.
For the scanning diamond NV center probe, columnar diamond was sharpened to a tip of 1.3 μm using a focused ion beam (FIB).The magnetic sample was a thin film island structure of cobalt iron (CoFe).The magnetic field image was obtained by mapping the fluorescence intensity at specific frequencies from the ODMR spectrum acquired by scanning the sample surface.

Free Research Field

スピントロニクス

Academic Significance and Societal Importance of the Research Achievements

これまでの開発で得られた知見に加え、新たに開発した走査ダイヤモンドNV中心プローブの手法によって、磁場分布を持った磁性試料の磁場イメージングを、既存の測定装置と比較・検証できるレベルで確立できたことは、さらなる感度・空間分解能向上や超高真空・極低温というノイズの少ない環境下での動作の検証に必要な足掛かりであり、今後の研究を推進するうえで重要な意義がある。