2026-05-08 理化学研究所,名古屋大学,東北大学
メモリスタにおいて巨大なインダクタンスが発現し、コイル不要の発振器を実現
＜関連情報＞
- https://www.riken.jp/press/2026/20260508_2/index.html
- https://www.nature.com/articles/s41598-026-48808-5
分子メモリスタにおける巨大な創発インダクタンス Colossal emergent inductance in a molecular memristor
Yugo Oshima,Rei Usami,Tetsuro Moriya,Taishi Takenobu & Shinya Takaishi
Scientific Reports Published:08 May 2026
DOI:https://doi.org/10.1038/s41598-026-48808-5
Abstract
Memristors exhibit history-dependent transport and are widely studied for their hysteretic current–voltage characteristics, yet their dynamical electrodynamic roles remain largely unexplored. Here, we investigate the quasi-one-dimensional halogen-bridged metal complex [Ni(chxn)2Br]Br2 using transport measurements, impedance spectroscopy, and oscillation analysis. We show that this material functions as a memristor exhibiting a clear pinched hysteresis loop (PHL) under ac bias. Remarkably, this hysteresis gives rise to a colossal emergent inductance of104 – 105H, far exceeding that of conventional coil-based inductors. The inductive response appears only under finite bias, ruling out parasitic origins, and is independently confirmed by impedance spectroscopy and oscillation-frequency analysis. When combined with a simple capacitor, this intrinsic inductance together with negative differential resistance drives self-sustained oscillations without any external inductor, redefining the origin of oscillatory behavior in this system. These results establish emergent inductance as a fundamental memristive property, reveal a new electrodynamic functionality in correlated molecular materials, and suggest potential routes toward coil-free low-frequency functionalities in electronic and neuromorphic systems.
