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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author 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,
Project Discovery and Nanoengineering of Novel Skyrmion-hosting Materials
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Original article (peer-reviewed)

Journal Physical Review Letters
Volume (Issue) 124(2)
Page(s) 027203 - 027203
Title of proceedings Physical Review Letters
DOI 10.1103/physrevlett.124.027203

Open Access

URL https://infoscience.epfl.ch/record/275566?&ln=en
Type of Open Access Green OA Embargo (Freely available via Repository after an embargo)

Abstract

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. 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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