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We present the experimental study of ultrafast optical excitation ofmagnetostatic surface spin wave (MSSW) packets and their spectral properties inthin films of pure iron. As the packets leave the excitation area and propagatein space, their spectra evolve non-trivially. Particularly, low or highfrequency components are suppressed at the border of the excitation areadepending on the orientation of the external magnetic field with respect to themagnetocrystolline anisotropy axes of the film. The effect is ascribed to theultrafast local heating of the film. Further, the time resolution of theimplemented all-optical technique allows us to extract the chirp of the MSSWpacket in the time domain via wavelet analysis. The chirp is a result of thegroup velocity dispersion of the MSSW and, thus, is controlled by the filmmagnetic parameters, magnetization and anisotropy, and external fieldorientation. The demonstrated tunable modulation of MSSW wave packets withfemtosecond laser pulses may find application in future magnonic-photonichybrid devices for wave-based data processing.

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