Current-driven transient dynamics of magnetic-octupole domain walls in noncollinear antiferromagnets
Abstract
Current-driven magnetic-octupole domain walls in noncollinear antiferromagnets are promising for fast spintronic devices, yet their transient dynamics are not yet fully understood. Here, we investigate spin-orbit-torque-driven domain-wall motion in Mn3Sn using a multipole micromagnetic framework. The three symmetry-related 60° walls exhibit equivalent current-driven dynamics, unlike their field-driven motion. For a representative 60° wall, the post-pulse motion is governed by relaxation of the current-induced rotation of the surrounding octupole domains, with a characteristic time of approximately 33 ps quantitatively captured by a uniform-domain analytic model. By resolving spatially nonuniform texture dynamics beyond this analytic description, the simulations further reveal an additional slow relaxation in a composite 180° wall associated with the relative motion of its constituent walls. The post-pulse response also varies systematically with the exchange stiffness and magnetic anisotropies. These results identify distinct domain and internal-coordinate relaxation channels and establish the intrinsic time scales governing pulse-controlled positioning of magnetic-octupole domain walls in antiferromagnetic spintronic devices.
Related
- Piezo-Kerr effect in altermagnets and noncollinear antiferromagnets
- Collinear and noncollinear antiferromagnetic ordering in a highly frustrated decorated square kagomé lattice antiferromagnets of the nabokoite family
- Emergence of the magnetic octupole Rashba-Edelstein effect from spin-orbit entanglement
- Polarized neutron diffraction with ex-situ 3He neutron spin filter and two-dimensional detector for noncollinear incommensurate magnetic order
- The bixbyite framework as a platform for frustrated noncollinear magnetism: resolving the magnetic ground state of β-Fe2O3
BibTeX
@misc{yoo2026currentdriven,
title = {{Current-driven transient dynamics of magnetic-octupole domain walls in noncollinear antiferromagnets}},
author = {Myoung-Woo Yoo and Axel Hoffmann},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.42065},
eprint = {2610.42065},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.42065},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Current-driven transient dynamics of magnetic-octupole domain walls in noncollinear antiferromagnets
AU - Myoung-Woo Yoo
AU - Axel Hoffmann
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.42065
UR - https://arxiv.org/abs/2610.42065
AB - Current-driven magnetic-octupole domain walls in noncollinear antiferromagnets are promising for fast spintronic devices, yet their transient dynamics are not yet fully understood. Here, we investigate spin-orbit-torque-driven domain-wall motion in Mn_3Sn using a multipole micromagnetic framework. The three symmetry-related 60° walls exhibit equivalent current-driven dynamics, unlike their field-driven motion. For a representative 60° wall, the post-pulse motion is governed by relaxation of the current-induced rotation of the surrounding octupole domains, with a characteristic time of approximately 33 ps quantitatively captured by a uniform-domain analytic model. By resolving spatially nonuniform texture dynamics beyond this analytic description, the simulations further reveal an additional slow relaxation in a composite 180° wall associated with the relative motion of its constituent walls. The post-pulse response also varies systematically with the exchange stiffness and magnetic anisotropies. These results identify distinct domain and internal-coordinate relaxation channels and establish the intrinsic time scales governing pulse-controlled positioning of magnetic-octupole domain walls in antiferromagnetic spintronic devices.
ER -