Current-controlled propagation of spin waves in antiparallel, coupled domains
Liu, Chuanpu; Wu, Shizhe; Zhang, Jianyu; Chen, Jilei; Ding, Jinjun; Ma, Ji; Zhang, Yuelin; Sun, Yuanwei; Tu, Sa; Wang, Hanchen; Liu, Pengfei; Li, Chexin; Jiang, Yong; Gao, Peng; Yu, Dapeng; Xiao, Jiang; Duine, Rembert; Wu, Mingzhong; Nan, Ce Wen; Zhang, Jinxing; Yu, Haiming
(2019) Nature Nanotechnology, volume 14, issue 7, pp. 691 - 697
(Article)
Abstract
Spin waves may constitute key components of low-power spintronic devices. Antiferromagnetic-type spin waves are innately high-speed, stable and dual-polarized. So far, it has remained challenging to excite and manipulate antiferromagnetic-type propagating spin waves. Here, we investigate spin waves in periodic 100-nm-wide stripe domains with alternating upward and downward magnetization in
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La 0.67 Sr 0.33 MnO 3 thin films. In addition to ordinary low-frequency modes, a high-frequency mode around 10 GHz is observed and propagates along the stripe domains with a spin-wave dispersion different from the low-frequency mode. Based on a theoretical model that considers two oppositely oriented coupled domains, this high-frequency mode is accounted for as an effective antiferromagnetic spin-wave mode. The spin waves exhibit group velocities of 2.6 km s −1 and propagate even at zero magnetic bias field. An electric current pulse with a density of only 10 5 A cm −2 can controllably modify the orientation of the stripe domains, which opens up perspectives for reconfigurable magnonic devices.
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Keywords: Bioengineering, Atomic and Molecular Physics, and Optics, Biomedical Engineering, Materials Science(all), Condensed Matter Physics, Electrical and Electronic Engineering
ISSN: 1748-3387
Publisher: Nature Publishing Group
(Peer reviewed)
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