Chiral Spin-Wave Velocities Induced by All-Garnet Interfacial Dzyaloshinskii-Moriya Interaction in Ultrathin Yttrium Iron Garnet Films

Wang, Hanchen; Chen, Jilei; Liu, Tao; Zhang, Jianyu; Baumgaertl, Korbinian; Guo, Chenyang; Li, Yuehui; Liu, Chuanpu; Che, Ping; Tu, Sa; Liu, Song; Gao, Peng; Han, Xiufeng; Yu, Dapeng; Wu, Mingzhong; Grundler, Dirk; Yu, Haiming

doi:10.1103/physrevlett.124.027203

Title: Chiral Spin-Wave Velocities Induced by All-Garnet Interfacial Dzyaloshinskii-Moriya Interaction in Ultrathin Yttrium Iron Garnet Films

Journal Article · Tue Jan 14 00:00:00 EST 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.124.027203· OSTI ID:1803485

^[1]; Chen, Jilei ^[2]; Liu, Tao ^[3]; Zhang, Jianyu ^[1];

^[4]; Guo, Chenyang ^[5]; Li, Yuehui ^[6]; Liu, Chuanpu ^[7]; Che, Ping ^[4]; Tu, Sa ^[1]; Liu, Song ^[8]; Gao, Peng ^[9]; Han, Xiufeng ^[5]; Yu, Dapeng ^[10]; Wu, Mingzhong ^[3]; Grundler, Dirk ^[4];

^[1]

Beihang University, Beijing (China)
Beihang University, Beijing (China); Ecole Polytechnique Federale Lausanne (Switzerland)
Colorado State Univ., Fort Collins, CO (United States)
Ecole Polytechnique Federale Lausanne (Switzerland)
University of Chinese Academy of Sciences, Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China)
Peking Univ., Beijing (China)
Beihang University, Beijing (China); Colorado State Univ., Fort Collins, CO (United States)
Southern University of Science and Technology (SUSTech), Shenzhen (China)
Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Southern University of Science and Technology (SUSTech), Shenzhen (China); Peking Univ., Beijing (China)

Spin waves can probe the Dzyaloshinskii-Moriya interaction (DMI), which gives rise to topological spin textures, such as skyrmions. However, the DMI has not yet been reported in yttrium iron garnet (YIG) with arguably the lowest damping for spin waves. In this work, we experimentally evidence the interfacial DMI in a 7-nm-thick YIG film by measuring the nonreciprocal spin-wave propagation in terms of frequency, amplitude, and most importantly group velocities using all electrical spin-wave spectroscopy. The velocities of propagating spin waves show chirality among three vectors, i.e., the film normal direction, applied field, and spin-wave wave vector. By measuring the asymmetric group velocities, we extract a DMI constant of 16 μJ/m², which we independently confirm by Brillouin light scattering. In this work, thickness-dependent measurements reveal that the DMI originates from the oxide interface between the YIG and garnet substrate. The interfacial DMI discovered in the ultrathin YIG films is of key importance for functional chiral magnonics as ultralow spin-wave damping can be achieved.

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Research Organization:: Colorado State Univ., Fort Collins, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); National Key Research and Development Program of China; National Science Foundation (NSF)

Grant/Contract Number:: SC0018994; 11674020; U1801661; 2016YFA0300802; 2017YFA0206200; ANR-12-ASTR-0023; 163016; 171003; EFMA-1641989; 51672007; 11974023; 2018B030327001; 2018B010109009

OSTI ID:: 1803485

Journal Information:: Physical Review Letters, Vol. 124, Issue 2; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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