期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.097201
关键词
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资金
- European Commission's 7th Framework Programme [228673 (MAGNONICS), 233552 (DYNAMAG)]
- EPSRC of the United Kingdom [EP/E055087/1]
- Flanders Research Foundation (FWO)
- EPSRC [EP/E055087/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E055087/1] Funding Source: researchfish
An all-optical experiment long utilized to image phonons excited by ultrashort optical pulses has been applied to a magnetic sample. In addition to circular ripples due to surface acoustic waves, we observe an X-shaped pattern formed by propagating spin waves. The emission of spin waves from the optical pulse epicenter in the form of collimated beams is qualitatively reproduced by micromagnetic simulations. We explain the observed pattern in terms of the group velocity distribution of Damon-Eshbach magnetostatic spin waves in the reciprocal space and the wave vector spectrum of the focused ultrafast laser pulse. DOI: 10.1103/PhysRevLett.110.097201
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