2018 Fiscal Year Final Research Report

Thermodynamic Spin Conversion

Planned Research

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Project Area	nano spin conversion science
Project/Area Number	26103005
Research Category	Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
Allocation Type	Single-year Grants
Review Section	Science and Engineering
Research Institution	The University of Tokyo (2018) Tohoku University (2014-2017)
Principal Investigator	SAITOH Eiji 東京大学, 大学院工学系研究科(工学部), 教授 (80338251)
Co-Investigator(Kenkyū-buntansha)	高梨弘毅東北大学, 金属材料研究所, 教授 (00187981) 小野正雄国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門原子力科学研究所先端基礎研究センター, 研究副主幹 (50370375)
Research Collaborator	NIIZEKI Tomohiko YOKOI Naoto
Project Period (FY)	2014-07-10 – 2019-03-31
Keywords	スピン流 / スピントロニクス / 磁性物理 / スピンメカニクス
Outline of Final Research Achievements	By the collaboration of researchers specialized in mechanics, condensed matter physics, and material engineering, our group open the new research area, placed between spintronics and mechanics, through the intensive studies on the interaction between electric current, spin current, mechanical motion, and heat in various materials. As a result, the target material of spintronics, which have been limited to condensed matter, is extended to liquid metal, gas spin, nuclear spin, and cantilever. The cantilever was made of magnetic materials and fabricated　with micro-mechanical techniques. Moreover, we developed the theory about the heat-energy exchange in magnetic materials, including multi-layered magnetic film, anti-ferromagnetic materials, and one-dimensional quantum-spin liquid.
Free Research Field	物性物理学
Academic Significance and Societal Importance of the Research Achievements	本研究では、スピン角運動量の流れである「スピン流」を基盤とし、角運動量保存に基づく変換原理の有用性を現代科学の体系に組み込むことで、革命的な科学技術の進展をもたらすことに成功した。例えば、スピン変換現象を統一的に理解し、力学運動と熱とのスピン変換という新しい学術領域の創生という学術的意義を生み出した。さらに、従来のエネルギー変換単独では成し得なかったスピン-熱-力学運動間の角運動量変換を利用したエネルギー変換技術体系の構築は、社会的にも意義深い成果である。