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. 2017 Jul 18;7:5668. doi: 10.1038/s41598-017-05742-x

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Influence of the external magnetic field on the phase and wavenumber of the spin waves optically generated by the 1GHz-laser in sample-A (a,b), and by the 80MHz-laser in sample-A (c), and sample-B (d). The spin waves are traced along the x-axis. (b) Distribution of the SW magnetization component parallel to the probe beam (measured by Faraday rotation, Ψ) at the moments when it is maximal at x = 0. Insets: amplitude of the spin waves (measured by Faraday rotation, Ψ ₀) at x = 0 versus external magnetic field. Experimental data are shown as dots while calculation results are presented by solid curves. For the calculations of the phase ξ(x), α = 4 × 10⁻³ for the sample-A (a–c) and α = 20 × 10⁻³ for the sample-B (d) are taken. For the calculations of the SW amplitude, α _SW = 6.5 × 10⁻³ (insets in a and c).