Enhancement of Low‐k Spin‐Wave Transmission Efficiency with a Record‐High Group Velocity in YIG/Nonmagnetic Metal Heterojunctions

Jiapeng Xu; Zhimin Liao; Qi Wang; Bo Liu; Xiaoli Tang; Zhiyong Zhong; Lei Zhang; Yuanjing Zhang; Huaiwu Zhang; Lichuan Jin

doi:10.1002/aelm.202201061

Advanced Electronic Materials (Feb 2023)

Enhancement of Low‐k Spin‐Wave Transmission Efficiency with a Record‐High Group Velocity in YIG/Nonmagnetic Metal Heterojunctions

Jiapeng Xu,
Zhimin Liao,
Qi Wang,
Bo Liu,
Xiaoli Tang,
Zhiyong Zhong,
Lei Zhang,
Yuanjing Zhang,
Huaiwu Zhang,
Lichuan Jin

Affiliations

Jiapeng Xu: State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China
Zhimin Liao: Beijing Key Laboratory of Quantum Devices Peking University Beijing 100871 China
Qi Wang: Faculty of Physics University of Vienna Boltzmanngasse 5 Vienna A‐1090 Austria
Bo Liu: Key Laboratory of Spintronics Materials Devices and Systems of Zhejiang Province Hangzhou 311305 China
Xiaoli Tang: State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China
Zhiyong Zhong: State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China
Lei Zhang: State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China
Yuanjing Zhang: State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China
Huaiwu Zhang: State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China
Lichuan Jin: State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China

DOI: https://doi.org/10.1002/aelm.202201061
Journal volume & issue: Vol. 9, no. 2
pp. n/a – n/a

Abstract

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Abstract Improvement of transmission efficiency of spin waves in magnonic devices is crucial for high‐efficiency magnon‐based operations. However, existing techniques for enhancing spin‐wave detection signals, which either improve waveguide material quality or convert other forms of external energy into magnon energy, are still not efficient and convenient enough. Here, it is experimentally demonstrated that low‐k spin waves (where k is the wavenumber) transmission efficiency can be enhanced through yttrium iron garnet (YIG) surface metallization owing to the significantly increased group velocity and low spin‐pumping efficiency at low k. Given that the shielding effect of the conductive metal on YIG increases the spin‐wave group velocity from 55 to 132 km s−1, the weak magnon‐dissipation mechanism of low‐k spin waves provides the foundation for signal enhancement. Through a detailed theoretical analysis on dispersion relations and spin‐wave amplitude, the detected signal strength is increased to 2 times for copper and 2.24 times for gold is verified. In detail the competition between the spin‐pumping effect is discussed and the enhanced group velocity is introduced by the metal decoration. This competition describes the essence of partial signal enhancement in the spin‐wave transmission spectrum. The work provides a practical way to achieve spin‐wave manipulation and low‐loss transmission.

Published in Advanced Electronic Materials

ISSN: 2199-160X (Online)
Publisher: Wiley-VCH
Country of publisher: Germany
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Electric apparatus and materials. Electric circuits. Electric networks; Science: Physics
Website: https://onlinelibrary.wiley.com/journal/2199160x

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