Direct excitation of propagating spin waves by focused ultrashort optical pulses
Au, Y.; Dvornik, Mykola; Davison, T.; et al.Ahmad, E.; Keatley, Paul Steven; Vansteenkiste, A.; Van Waeyenberge, B.; Kruglyak, V.V.
Date: 25 February 2013
Article
Journal
Physical Review Letters
Publisher
American Physical Society
Publisher DOI
Abstract
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 ...
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.
Physics and Astronomy
Faculty of Environment, Science and Economy
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