Pure spin current polarizer enabled by antiferromagnetic insulator

Hetian Chen, Dingsong Jiang, Yujun Zhang, Xiaofu Qiu, Yuhan Liang, Qinghua Zhang, Fangyuan Zhu, Takuo Ohkochi, Mingfeng Chen, Yue Wang, Jingchun Liu, Qing He, Jing Ma, Pu Yu, Yuanhua Lin, Tianxiang Nan () and Di Yi ()
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Hetian Chen: Tsinghua University
Dingsong Jiang: Tsinghua University
Yujun Zhang: Chinese Academy of Sciences
Xiaofu Qiu: Tsinghua University
Yuhan Liang: Tsinghua University
Qinghua Zhang: Chinese Academy of Sciences
Fangyuan Zhu: Chinese Academy of Sciences
Takuo Ohkochi: University of Hyogo
Mingfeng Chen: Tsinghua University
Yue Wang: Tsinghua University
Jingchun Liu: Tsinghua University
Qing He: Durham University
Jing Ma: Tsinghua University
Pu Yu: Tsinghua University
Yuanhua Lin: Tsinghua University
Tianxiang Nan: Tsinghua University
Di Yi: Tsinghua University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Pure spin current enables the transport of spin information without charge flow, providing opportunities for next-generation information technologies. A pure spin current polarizer, capable of controlling both its transmittance and spin polarization, is critical for the development of spintronics; however, it has not yet been demonstrated. Here, we demonstrate a highly efficient pure spin current polarizer at room temperature using a single-domain antiferromagnetic insulator film, through structural engineering and spin-lattice coupling. Our device exhibits a large differential magnon current transmittance at room temperature. Remarkably, we find that the spin polarization of the transmitted magnon current aligns with the Néel vector of the polarizer. This enables a large modulation of damping-like torque and generation of out-of-plane-polarized magnon current, offering alternative routes for developing energy-efficient spintronic devices. We anticipate that this pure spin current polarizer will serve as a building block for spintronics based on pure spin current.

Date: 2025
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DOI: 10.1038/s41467-025-61490-x

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