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 MnX (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 MnX. The magneto-optical Kerr observation reveals the Néel-like MODW of MnGe can be accelerated up to 750 m s with a current density of only 7.56 × 10 A m 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.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11166987 | PMC |
http://dx.doi.org/10.1038/s41467-024-48440-9 | DOI Listing |
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