2024/01/11
Keio University
A research group including Yu Matsushima (second-year master's student), Zijing Zhang (third-year doctoral student), and Ko Hatakeyama (first-year master's student) from the Graduate School of Science and Technology at Keio University, and Professor Hideo Kaiju from the university's Faculty of Science and Technology, in collaboration with Professor Gang Xiao of the Department of Physics at Brown University, Project Assistant Professor Takumi Funato of the Keio University Global Research Institute (Spintronics Research and Development Center), and Associate Professor Mamoru Matsuo of the Kavli Institute for Theoretical Sciences at the University of Chinese Academy of Sciences, has succeeded in observing emergent inductance at room temperature and low magnetic fields in magnetic thin films on flexible substrates and in elucidating its mechanism. An emergent inductor, which utilizes the spin electromotive force generated in nanoscale helical magnetic structures, has been attracting significant attention in recent years. In this study, the team efficiently generated magnetic domain walls by applying a "staircase-like magnetic field" to a magnetic thin film of Permalloy (an alloy of nickel and iron), a commonly used magnetic material. By driving these domain walls with an electric current, they succeeded in observing a large emergent inductance at a low magnetic field. Furthermore, they elucidated the mechanism by combining the Landau-Lifshitz-Gilbert equation with statistical theory. This achievement paves a new way for flexible magnetic electronics.
These research findings were published online in Applied Physics Letters (American Institute of Physics group) on January 10 (U.S. Eastern Time).
Please see below for the full press release.