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arXiv · 2510.26208

Transverse and Unidirectional Spin Pumping

Ping Li·Chengyuan Cai·Tao Yu
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Abstract

Conventional spin pumping, driven by magnetization dynamics, is longitudinal since the pumped spin current flows normal to the interface between the ferromagnet and the conductor. We predict \textit{Hall-type/transverse} and \textit{unidirectional} spin pumping into conductors by near-field electromagnetic radiation emitted by, \textit{e.g.}, magnetization dynamics. The joint effect of the electric and magnetic fields results in a pure spin current flowing parallel to the interface, i.e., a Hall-type spin pumping, which is highly efficient due to the strong coupling to the electric field. Such a transverse spin current is unidirectional, with the spatial distribution controlled by the magnetization direction. Our finding reveals a robust approach for generating and manipulating spin currents in future low-dimensional spintronic and orbitronic devices.

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Ping Li, Chengyuan Cai, Tao Yu. 2025-10-30. Transverse and Unidirectional Spin Pumping. https://arxiv.org/abs/2510.26208

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