Spin Seebeck in the weakly exchange-coupled Van der Waals antiferromagnet across the spin-flip transition

Xue He, Shilei Ding (), Hans Gløckner Giil, Jicheng Wang, Mona Bhukta, Mingxing Wu, Wen Shi, Zhongchong Lin, Zhongyu Liang, Jinbo Yang (), Mathias Kläui, Arne Brataas, Yanglong Hou () and Rui Wu ()
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Xue He: South China University of Technology
Shilei Ding: ETH Zürich
Hans Gløckner Giil: Norwegian University of Science and Technology
Jicheng Wang: South China University of Technology
Mona Bhukta: Johannes Gutenberg-University Mainz
Mingxing Wu: ETH Zürich
Wen Shi: South China University of Technology
Zhongchong Lin: Peking University
Zhongyu Liang: Peking University
Jinbo Yang: Peking University
Mathias Kläui: Norwegian University of Science and Technology
Arne Brataas: Norwegian University of Science and Technology
Yanglong Hou: Shenzhen Campus of Sun Yat-Sen University
Rui Wu: South China University of Technology

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

Abstract: Abstract Spin Seebeck effect refers to the creation of spin currents due to a temperature gradient in the magnetic materials or across magnet-normal metal interfaces, which can be electrically detected through the inverse spin Hall effect when in contact with heavy metals. It offers fundamental insights into the magnetic properties of materials, including the magnetic phase transition, static magnetic order, and magnon excitations. The behavior of the spin Seebeck effect across the spin-flop transition has been extensively studied, whereas the spin Seebeck effect across the spin-flip transition remains poorly understood. Here, we demonstrate the spin Seebeck effect in a weakly exchange-coupled van der Waals antiferromagnet CrPS4. The spin Seebeck effect increases as the magnetic field increases before the spin-flip transition due to the enhancement of the thermal spin current as a function of the applied field. A peak of spin Seebeck effect is observed at the spin-flip field, which is related to the magnon mode edges across the spin-flip field. Our results extend spin Seebeck effect research to van der Waals antiferromagnets and demonstrate an enhancement of spin Seebeck effect at the spin-flip transition.

Date: 2025
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DOI: 10.1038/s41467-025-58306-3

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