Development and application of new spintronics functionalities by using ionic conductor

2022 Fiscal Year Final Research Report

• Project/Area Number: 19H02586
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 29010:Applied physical properties-related
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Kondou Kouta 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, 上級研究員 (60640670)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 界面スピン変換 / 酸素イオン / キラル分子

Outline of Final Research Achievements

In this project, we investigated the development and application of new spintronics functions by inducing asymmetric charge distribution at material interfaces by using ionic conductor. Utilizing oxygen ion conducting materials like tantalum oxide, we found that the spin-charge conversion signals have been enhanced due to additional conversion at the metal/metal-oxide interfaces by factor two. Furthermore, from the viewpoint of developing the interfacial spintronics functionalities, we have also study using chiral molecular materials. As a result, we have successfully observed thermally-induced spin polarization and resulting magneto-resistive effect in a chiral molecule/metal bilayer device.

Free Research Field

スピントロニクス

Academic Significance and Societal Importance of the Research Achievements

酸素によって誘起される空間反転対称性の破れ由来のスピン変換機能発現の原理を応用することで, スピン機能を外部電界などで不揮発に制御できる可能性がある. それだけでなく, 金属中を伝搬するイオンの移動速度の電気的検出などへの研究展開も期待される.さらに, キラル分子を用いた磁気抵抗効果の発現は, 分子材料が持つ特異な微細構造がスピン機能を発現するのに有用であることを示すものであり, 今後, 無機固体材料とは質的に異なる有機分子スピントロニクスの基礎研究の発展につながることが期待される.