Switching magnon chirality in artificial ferrimagnet

Yahui Liu, Zhengmeng Xu, Lin Liu, Kai Zhang, Yang Meng (), Yuanwei Sun, Peng Gao, Hong-Wu Zhao, Qian Niu () and J. Li ()
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Yahui Liu: Peking University
Zhengmeng Xu: Peking University
Lin Liu: Peking University
Kai Zhang: Peking University
Yang Meng: Chinese Academy of Sciences
Yuanwei Sun: Peking University
Peng Gao: Peking University
Hong-Wu Zhao: Chinese Academy of Sciences
Qian Niu: University of Science and Technology of China
J. Li: Peking University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Chirality, an intrinsic degree of freedom, has been barely exploited as the information carriers in data transmission, processing, computing, etc. Recently the magnons in antiferromagnets were proposed to carry both right-handed and left-handed chiralities, shedding a light on chirality-based spintronics in which chirality-based computing architectures and chiral magnonic devices may become feasible. However, the practical platform for chirality-based spintronics remains absent yet. Here we report an artificial ferrimagnetic Py/Gd/Py/Gd/Py/Pt multilayer by which the switching, reading, and modulation of magnon chirality are demonstrated. In particular, the coexisting resonance modes of ferromagnetic and antiferromagnetic characteristics permit the high adjustability and easy control of magnon chirality. As a main result, we unambiguously demonstrated that Py precessions with opposite chiralities pump spin currents of opposite spin polarizations into the Pt layer. Our result manifests the chirality as an independent degree of freedom and illustrates a practical magnonic platform for exploiting chirality, paving the way for chirality-based spintronics.

Date: 2022
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DOI: 10.1038/s41467-022-28965-7

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