Exploration of quantum transport phenomena utilizing magnetic fluctuations of non-collinear spin textures

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14011
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Fujishiro Yukako 国立研究開発法人理化学研究所, 創発物性科学研究センター, 基礎科学特別研究員 (00883646)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: らせん磁性 / スピン揺らぎ / 電荷輸送特性 / 超高圧 / 収束イオンビーム加工 / 量子臨界

Outline of Final Research Achievements

In this study, we focused on non-collinear magnetic structures such as helical magnetism and explored new charge transport properties using spin dynamics. Specifically, by investigating the quantum phase transition of helical magnetism and skyrmions under ultra-high pressure, we discovered a peculiar anomalous Hall effect that breaks time-reversal symmetry with only short-range magnetic correlations in regions where quantum fluctuations are developed. Additionally, we explored emergent inductors driven by current-induced spin dynamics and observed novel complex sign changes depending on the microscopic magnetic structures.

Free Research Field

物性物理学

Academic Significance and Societal Importance of the Research Achievements

絶対零度近傍における量子揺らぎを利用した新規な異常ホール効果の発見は、これまで強磁性・反強磁性などの単純な磁気構造に注目してきた量子相転移の研究をより多彩な磁気構造に拡張するという点で学術的意義があると考えられる。また、電流駆動スピンダイナミクスによる創発電場の発生は、インダクタ素子の微細化への応用が期待できるため、電子デバイスの小型化に貢献することが期待される。