Antiferromagnetic magnonic charge current generation via ultrafast optical excitation

Lin Huang, Liyang Liao, Hongsong Qiu, Xianzhe Chen, Hua Bai, Lei Han, Yongjian Zhou, Yichen Su, Zhiyuan Zhou, Feng Pan, Biaobing Jin () and Cheng Song ()
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Lin Huang: Tsinghua University
Liyang Liao: Tsinghua University
Hongsong Qiu: Nanjing University
Xianzhe Chen: University of California
Hua Bai: Tsinghua University
Lei Han: Tsinghua University
Yongjian Zhou: Tsinghua University
Yichen Su: Tsinghua University
Zhiyuan Zhou: Tsinghua University
Feng Pan: Tsinghua University
Biaobing Jin: Nanjing University
Cheng Song: Tsinghua University

Nature Communications, 2024, vol. 15, issue 1, 1-5

Abstract: Abstract Néel spin-orbit torque allows a charge current pulse to efficiently manipulate the Néel vector in antiferromagnets, which offers a unique opportunity for ultrahigh density information storage with high speed. However, the reciprocal process of Néel spin-orbit torque, the generation of ultrafast charge current in antiferromagnets has not been demonstrated. Here, we show the experimental observation of charge current generation in antiferromagnetic metallic Mn2Au thin films using ultrafast optical excitation. The ultrafast laser pulse excites antiferromagnetic magnons, resulting in instantaneous non-equilibrium spin polarization at the antiferromagnetic spin sublattices with broken spatial symmetry. Then the charge current is generated directly via spin-orbit fields at the two sublattices, which is termed as the reciprocal phenomenon of Néel spin-orbit torque, and the associated THz emission can be detected at room temperature. Besides the fundamental significance on the Onsager reciprocity, the observed magnonic charge current generation in antiferromagnet would advance the development of antiferromagnetic THz emitter.

Date: 2024
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DOI: 10.1038/s41467-024-48391-1

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