九州大学 · 工学
Kohei Ito教授の研究室では、スピントランスポートトルクを用いた磁性スイッチングの低電力化に注力しており、プリセッション運動を誘発する外部磁場の併用によって、スイッチングに必要な電流を顕著に低減するメカニズムをマクロな磁気シミュレーションで解明しています。また、高圧型固体高分子形水素発生装置（PEMWE）の効率向上を目的に、気泡の分離を促進する制御された親水性電極材料の開発も進めています。これらの研究は、次世代の低消費電力スピントロニクス素子と高効率水素エネルギー変換技術の両分野に貢献するものです。
Figures are computed from collected data and may differ slightly.
The authors have performed micromagnetic simulations of spin transfer torque (STT) switching, combined with precessional motion induced by a pulsed or static hard axis field. They have found a significant reduction in the current required for STT switching in the presence of precessional motion. In particular, the switching current can be reduced below the zero-temperature threshold current at dc, when the hard axis field exceeds a fourth of the free layer coercivity. The simulations indicate th
Hydrogen gas crossover, which reduces current efficiency, is critical issue in high pressure PEMWE (Polymer Electrolyte Membrane Water Electrolysis). This study proposes controlled wettability current collector, which enhances the detachment of hydrogen gas bubble from the current collector and decreases the crossover. A high pressure operation of a PEMWE cell with visualization clarified that the wettability impacts on the bubble dynamics and changes the current efficiency. Among the current co
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