Giant nonlinear self-phase modulation of large-amplitude spin waves in microscopic YIG waveguides

Nonlinear self-phase modulation is a universal phenomenon responsible, for example, for the formation of propagating dynamic solitons. It has been reported for waves of different physical nature. However its direct experimental observation for spin waves has been challenging. Here we show that excep...

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Bibliographic Details
Published in:Scientific reports 2022-05, Vol.12 (1), p.7246-7246, Article 7246
Main Authors: Merbouche, H., Divinskiy, B., Nikolaev, K. O., Kaspar, C., Pernice, W. H. P., Gouéré, D., Lebrun, R., Cros, V., Ben Youssef, J., Bortolotti, P., Anane, A., Demokritov, S. O., Demidov, V. E.
Format: Article
Language:English
Subjects:
639/766/119/1001
639/766/119/2793
639/766/119/997
Humanities and Social Sciences
multidisciplinary
Physics
Propagation
Science
Science (multidisciplinary)
Spatial variations
Spectrum analysis
Temporal variations
Waves
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Summary:Nonlinear self-phase modulation is a universal phenomenon responsible, for example, for the formation of propagating dynamic solitons. It has been reported for waves of different physical nature. However its direct experimental observation for spin waves has been challenging. Here we show that exceptionally strong phase modulation can be achieved for spin waves in microscopic waveguides fabricated from nanometer-thick films of magnetic insulator, which support propagation of spin waves with large amplitudes corresponding to angles of magnetization precession exceeding 10°. At these amplitudes, the nonstationary nonlinear dynamic response of the spin system causes an extreme broadening of the spectrum of spin-wave pulses resulting in a strong spatial variation of the spin-wave wavelength and a temporal variation of the spin-wave phase across the pulse. Our findings demonstrate great complexity of nonlinear wave processes in microscopic magnetic structures and importance of their understanding for technical applications of spin waves in integrated devices.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-10822-8