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Current-driven fast magnetic octupole domain-wall motion in noncollinear antiferromagnets

Authors :
Mingxing Wu
Taishi Chen
Takuya Nomoto
Yaroslav Tserkovnyak
Hironari Isshiki
Yoshinobu Nakatani
Tomoya Higo
Takahiro Tomita
Kouta Kondou
Ryotaro Arita
Satoru Nakatsuji
Yoshichika Otani
Source :
Nature Communications, Vol 15, Iss 1, Pp 1-9 (2024)
Publication Year :
2024
Publisher :
Nature Portfolio, 2024.

Abstract

Abstract Antiferromagnets (AFMs) have the natural advantages of terahertz spin dynamics and negligible stray fields, thus appealing for use in domain-wall applications. However, their insensitive magneto-electric responses make controlling them in domain-wall devices challenging. Recent research on noncollinear chiral AFMs Mn3X (X = Sn, Ge) enabled us to detect and manipulate their magnetic octupole domain states. Here, we demonstrate a current-driven fast magnetic octupole domain-wall (MODW) motion in Mn3X. The magneto-optical Kerr observation reveals the Néel-like MODW of Mn3Ge can be accelerated up to 750 m s-1 with a current density of only 7.56 × 1010 A m-2 without external magnetic fields. The MODWs show extremely high mobility with a small critical current density. We theoretically extend the spin-torque phenomenology for domain-wall dynamics from collinear to noncollinear magnetic systems. Our study opens a new route for antiferromagnetic domain-wall-based applications.

Subjects

Subjects :
Science

Details

Language :
English
ISSN :
20411723
Volume :
15
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Nature Communications
Publication Type :
Academic Journal
Accession number :
edsdoj.36ed40eeca6a49cca0ea0d824dc292c8
Document Type :
article
Full Text :
https://doi.org/10.1038/s41467-024-48440-9