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

Mingxing Wu, Taishi Chen, Takuya Nomoto, Yaroslav Tserkovnyak, Hironari Isshiki, Yoshinobu Nakatani, Tomoya Higo, Takahiro Tomita, Kouta Kondou, Ryotaro Arita, Satoru Nakatsuji and Yoshichika Otani ()
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Mingxing Wu: The University of Tokyo
Taishi Chen: The University of Tokyo
Takuya Nomoto: University of Tokyo
Yaroslav Tserkovnyak: University of California, Los Angeles
Hironari Isshiki: The University of Tokyo
Yoshinobu Nakatani: University of Electro-Communications
Tomoya Higo: The University of Tokyo
Takahiro Tomita: The University of Tokyo
Kouta Kondou: RIKEN
Ryotaro Arita: RIKEN
Satoru Nakatsuji: The University of Tokyo
Yoshichika Otani: The University of Tokyo

Nature Communications, 2024, vol. 15, issue 1, 1-9

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.

Date: 2024
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DOI: 10.1038/s41467-024-48440-9

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