期刊
NATURE NANOTECHNOLOGY
卷 14, 期 7, 页码 691-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41565-019-0429-7
关键词
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资金
- NSF China [11674020, 11444005, U1801661, 51788104, 11722430]
- 111 Talent Program [B16001]
- Ministry of Science and Technology of China MOST [2016YFA0300802]
- National Key Research and Development Program of China [2016YFA0302300]
- US National Science Foundation [EFMA-1641989]
- US Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0018994]
- U.S. Department of Energy (DOE) [DE-SC0018994] Funding Source: U.S. Department of Energy (DOE)
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 La0.67Sr0.33MnO3 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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