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Condensed Matter > Materials Science

arXiv:2503.08882 (cond-mat)
[Submitted on 11 Mar 2025]

Title:Néel vector rotation driven by spin-orbit torque in amorphous ferrimagnetic GdCo

Authors:Tetsuma Mandokoro, Yoichi Shiota, Tomoya Ito, Hiroki Matsumoto, Hideki Narita, Ryusuke Hisatomi, Shutaro Karube, Teruo Ono
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Abstract:Spin superfluidity, a phenomenon enabling low dissipative spin transport analogous to superfluidity in liquid helium and superconductivity in electronic systems, has remained a theoretical concept. To realize the spin superfluidity in an antiferromagnet, it is necessary to excite a Néel vector rotation within the magnetic easy-plane, which has been elusive so far. In this study, we demonstrated spin-orbit torque-driven Néel vector rotation in amorphous ferrimagnetic GdCo. A pseudo-magnetic easy-plane is formed in a spin-flop state under an external magnetic field at the vicinity of the magnetization compensation temperature, and we observed stochastic binary switching in the anomalous Hall resistance, directly attributed to Néel vector rotation. Furthermore, homodyne detection confirmed rotation frequencies in the GHz range as expected from atomic spin simulations, providing evidence of dynamic Néel vector behavior. These findings represent a crucial advance towards the realization of spin superfluidity.
Comments: 10 pages, 4 figures, Supporting Information
Subjects: Materials Science (cond-mat.mtrl-sci); Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Cite as: arXiv:2503.08882 [cond-mat.mtrl-sci]
  (or arXiv:2503.08882v1 [cond-mat.mtrl-sci] for this version)
  https://doi.org/10.48550/arXiv.2503.08882

Submission history

From: Yoichi Shiota [view email]
[v1] Tue, 11 Mar 2025 20:46:13 UTC (1,214 KB)
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