Dispersionless Propagation of Ultrashort Spin-Wave Pulses in Ultrathin Yttrium Iron Garnet Waveguides

Divinskiy, B.; Merbouche, Hugo; Nikolaev, K. O.; Vasoncellos, S. Michaelis de; Bratschitsch, Rudolf; Gouéré, D.; Lebrun, Romain; Cros, Vincent; Youssef, J. Ben; Bortolotti, Paolo; Anane, A.; Demokritov, S. O.; Demidov, V. E.

doi:10.1103/physrevapplied.16.024028

Cited by 7 publications

(3 citation statements)

References 45 publications

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“…This explains negligible effects of GVD in our experiment. We note, however, that the dispersion effects can become significant for pulses with the width T 0 of several nanoseconds 35 . Overall, the analysis clearly shows that the phase modulation observed in our experiment is not due to GVD, but is rather caused by the nonlinearity of the spin system.…”

Section: Resultsmentioning

confidence: 70%

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

Merbouche

Divinskiy

Nikolaev

et al. 2022

Sci Rep

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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.

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Section: Resultsmentioning

confidence: 70%

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

Merbouche

Divinskiy

Nikolaev

et al. 2022

Sci Rep

Self Cite

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“…In light of the requirements of engineering solutions to reduce the geometric dimensions of functional magnonic blocks [75,76], we must consider the transition to nanometer-sized structures with broken translational symmetry. Until recently, the transition of magnonic devices to the nanoscale region remained impossible due to limitations in the fabrication technologies, but recent studies have now shown the first steps towards the design and practical realization of nanoscale magnonic networks [9,[77][78][79][80][81][82]. The fabrication of nanoscale waveguide structures, while maintaining the θ = w/t aspect ratio in the A P B P magnonic bend, provides us with the possibility of transforming the spin-wave signal from BVMSW to MSSW type.…”

Section: Spin-wave Propagation In Nanoscale Yig Magnonic Bendmentioning

confidence: 99%

Magnonic Interconnections: Spin-Wave Propagation across Two-Dimensional and Three-Dimensional Junctions between Yttrium Iron Garnet Magnonic Stripes

2022

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Spin-wave transport across multidimensional networks of magnonic waveguides represents a crucial and necessary aspect of prospective densely packed three-dimensional spin-wave architectures. Here, we report the results of investigations of spin-wave propagation through magnonic waveguides extending along and bending across two and three dimensions. We consider three designs of in-plane two-dimensional bends, namely with right-angled, diagonal, and curved geometries. Our numerical and experimental results show that such bends facilitate the conversion of spin-wave types, with the output modal number depending on the spin-wave frequency. At the same time, variation of the width of lateral magnonic bends enables the spin-wave wavelength to be modified. When propagating across three-dimensional waveguide bends in the form of out-of-plane junctions, the spin-wave wavelength can similarly be tuned by adjusting the stripe's thickness. Our results show that magnonic waveguides can serve not only as passive conduits but also as active elements in modifying the properties of the transmitted spin wave in three-dimensional magnonic networks.

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“…To make the effect more prominent at smaller distances, it is possible to use magnonic crystals, multilayered structures, or their hybrids [43][44][45] with a high dispersion of the group velocity of SWs. On the flipside, the geometrical design of the waveguide paves the way to suppress the dispersion altogether 46,47 .…”

Section: Please Cite This Article Asmentioning

confidence: 99%

Spectrum evolution and chirping of laser-induced spin wave packets in thin iron films

Филатов

Gerevenkov

Wang

et al. 2022

Applied Physics Letters

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We present an experimental study of ultrafast optical excitation of magnetostatic surface spin wave (MSSW) packets and their spectral properties in thin films of pure iron. As the packets leave the excitation area and propagate in space, their spectra evolve non-trivially. Particularly, low or high frequency components are suppressed at the border of the excitation area depending on the orientation of the external magnetic field with respect to the magnetocrystalline anisotropy axes of the film. The effect is ascribed to the ultrafast local heating of the film. Furthermore, the time resolution of the implemented all-optical technique allows us to extract the chirp of the MSSW packet in the time domain via wavelet analysis. The chirp is a result of the group velocity dispersion of the MSSW and, thus, is controlled by the film's magnetic parameters, magnetization and anisotropy, and external field orientation. The demonstrated tunable modulation of MSSW wave packets with femtosecond laser pulses may find application in future magnonic-photonic hybrid devices for wave-based data processing.

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Dispersionless Propagation of Ultrashort Spin-Wave Pulses in Ultrathin Yttrium Iron Garnet Waveguides

Cited by 7 publications

References 45 publications

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

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

Magnonic Interconnections: Spin-Wave Propagation across Two-Dimensional and Three-Dimensional Junctions between Yttrium Iron Garnet Magnonic Stripes

Spectrum evolution and chirping of laser-induced spin wave packets in thin iron films

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