Develpment of superconducting spin valve josephson junctions

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04818
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 28020:Nanostructural physics-related
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Takamura Yota 東京工業大学, 工学院, 助教 (20708482)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: スピントロニクス / 超伝導体

Outline of Final Research Achievements

In this study, we evaluated CoFe2O4/Nb and Co2FeAlSi/Nb heterojunctions as material systems for superconducting spin Josephson junctions and conducted device fabrication and improvement. The interface evaluation between the ferromagnetic insulator and Nb confirmed that CoFe2O4/Nb exhibits a spin-related magnetoresistance effect. Optimization of nano-contact junctions was advanced. In the final year, a low-noise, high-sensitivity measurement system was introduced, successfully detecting spin signals. This provided crucial insights for the development of next-generation superconducting spintronics devices. Additionally, an international collaborative paper with MIT was published.

Free Research Field

スピントロニクス

Academic Significance and Societal Importance of the Research Achievements

本研究は、超伝導スピントロニクスデバイスの材料系としてCoFe2O4/NbとCo2FeAlSi/Nbヘテロ接合の有効性を示し、超伝導スピンバルブ効果を実証しました。これにより、超高感度で低エネルギー消費のスピントロニクスデバイスの開発に寄与し、次世代の情報処理技術の進展を促進します。さらに、MITとの国際共同研究を通じて、グローバルな学術交流を推進し、研究の信頼性と影響力を高めました。