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Harnessing magnetic octupole Hall effect to induce torque in altermagnets

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arxiv 2409.14423 v1 pith:SRKDYLSG submitted 2024-09-22 cond-mat.mes-hall

Seungyun Han , Daegeun Jo , Insu Baek , Peter M. Oppeneer , Hyun-Woo Lee This is my paper · ORCID
classification cond-mat.mes-hall
keywords magnetichallaltermagnetsoctupoletorqueheavyconductivityd-wave
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d-wave altermagnets have magnetic octupoles as their order parameters [Phys. Rev. X 14, 011019 (2024)]. We theoretically show that magnetic octupoles injected from outside generate torque on the d-wave altermagnets. The injection can be achieved by the magnetic octupole Hall effect in an adjacent layer. We calculate the magnetic octupole Hall conductivity of the heavy metal Pt and find a sizable value comparable to its spin Hall conductivity. Our work generalizes the spin Hall phenomenology (generation by heavy metals and detection by torque in ferromagnets) to the magnetic octupole Hall phenomenology (generation by heavy metals and detection by torque in altermagnets), which can be utilized to electrically control magnetic configurations of altermagnets.

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  1. Magnetic octupole Hall effect in heavy transition metals

    cond-mat.mtrl-sci 2025-07 conditional novelty 5.0 of 10

    First-principles calculations show that 4d and 5d transition metals host a large magnetic octupole Hall effect arising from orbital texture combined with spin-orbit coupling.

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