Investigation of the efficiency of spin-orbit torque induced magnetization switching in Functional oxide/ ferromagnetic stack films for a new In-memory computing

2022 Fiscal Year Annual Research Report

• Project/Area Number: 21K14522
• Research Institution: Tohoku University
• Principal Investigator: NGUYEN THIVANANH 東北大学, 先端スピントロニクス研究開発センター, 助教 (20840101)
• Project Period (FY): 2021-04-01 – 2023-03-31
• Keywords: RuO2 / spin-split effect / magnetization switching / functional oxides / spintronics

Outline of Annual Research Achievements

We have grown epitaxial RuO2 thin films on sapphire substrate, based on which the RuO2/Co-Fe-B stack was prepared for the investigation of the spin-orbit-torque-induced magnetization switching in this structure. Combining the experimental results from the harmonic Hall measurement and analysis of the symmetry of the spin Hall conductivity in this structure, we have detangled the spin-split effect (SSE) and the convention spin Hall effect in RuO2, and systematically summarized the value of SSE-induced spin-orbit-torque efficiency in this system. These results would be important for further research on the current-induced magnetization switching using functional oxides.

Research Products

• [Presentation] Dependence of dynamic magnetic properties on the Co-Fe-B layer thickness for Ta/Co-Fe-B and Ta-O/Co-Fe-B bilayers (2022)
  • Author(s): T. V. A. Nguyen, Y. Saito, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
  • Organizer: The 69th JSAP Spring Meeting 2022
• [Presentation] Preparation and spin-orbit torque measurement of RuO2/Co-Fe-B bilayer (2022)
  • Author(s): T. V. A. Nguyen, S. DuttaGupta, Y. Saito, S. Fukami, D. Vu, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
  • Organizer: The 83rd JSAP Autumn Meeting, 2023; Tohoku Univ. & Online
• [Presentation] Spin-orbit torques in RuO2/Co-Fe-B bilayer (2022)
  • Author(s): T. V. A. Nguyen, S. DuttaGupta, Y. Saito, S. Fukami, D. Vu, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
  • Organizer: 2022 MMM conference; Minneapolis, Minnesota, USA
  • Int'l Joint Research
• [Presentation] Spin-orbit torque measurement of RuO2/Co-Fe-B bilayer (2022)
  • Author(s): T. V. A. Nguyen, S. DuttaGupta, Y. Saito, S. Fukami, D. Vu, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
  • Organizer: 令和４年度スピニクス特別研究会
• [Presentation] Fabrication of RuO2 thin film for spin orbit torque induced magnetization switching (2022)
  • Author(s): T. V. A. Nguyen, S. DuttaGupta, Y. Saito, S. Fukami, D. Vu, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
  • Organizer: 6th International Symposium on Frontiers in Materials Science
  • Int'l Joint Research