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

نویسندگان

چکیده

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

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ژورنال

عنوان ژورنال: Applied Physics Letters

سال: 2022

ISSN: ['1520-8842', '0003-6951', '1077-3118']

DOI: https://doi.org/10.1063/5.0077195