2026-01-15 理化学研究所,東京大学,科学技術振興機構,ニューサウスウェールズ大学
電流によって駆動される磁壁（灰色部分）の運動と創発電場の発生
＜関連情報＞
- https://www.riken.jp/press/2026/20260115_3/index.html
- https://www.nature.com/articles/s41567-025-03124-z
ワイル磁性体における磁壁の散逸滑りダイナミクスによって誘起される創発電場 Emergent electric field induced by dissipative sliding dynamics of domain walls in a Weyl magnet
Rinsuke Yamada,Daichi Kurebayashi,Yukako Fujishiro,Shun Okumura,Daisuke Nakamura,Fehmi S. Yasin,Taro Nakajima,Tomoyuki Yokouchi,Akiko Kikkawa,Yasujiro Taguchi,Yoshinori Tokura,Oleg A. Tretiakov & Max Hirschberger
Nature Physics Published:15 January 2026
DOI:https://doi.org/10.1038/s41567-025-03124-z
Abstract
The dynamic motion of topological defects in magnets induces an emergent electric field, as exemplified by the continuous flow of skyrmion vortices. However, the electrodynamics underlying this emergent field remains poorly understood. In this context, magnetic domain walls—one-dimensional topological defects with two collective modes, sliding and spin-tilt—offer a promising platform for exploration. Here we demonstrate that the dissipative motion of domain walls under oscillatory current excitation generates an emergent electric field. We image domain patterns and quantify the domain-wall length under applied magnetic fields in mesoscopic devices based on the magnetic Weyl semimetal NdAlSi. These devices exhibit exceptionally strong domain-wall scattering and a pronounced emergent electric field, as observed in the imaginary component of the complex impedance. Spin dynamics simulations reveal that domain-wall sliding dominates over spin-tilting, in which the phase delay of the domain-wall motion with respect to the driving force impacts the emergent electric field. Our findings establish domain-wall dynamics as a platform for studying emergent electromagnetic fields and motivate further investigations of the coupled motion of magnetic solitons and conduction electrons.
