The nonlinearity of magnetization precession and spin waves is a cornerstone of contemporary magnonics. We investigate nonlinear magnetization dynamics in a thin epitaxial iron film driven by femtosecond laser pulses in regimes of homogeneous precession and propagating magnetostatic spin wave packets. The magnetization precession anharmonicity, the generation of higher-order harmonics, and the dynamical rectification are experimentally demonstrated. The numerical solution of the non-linearized Landau-Lifshitz-Gilbert equation reveals that these effects stem from the asymmetry in the energy potential and are essentially thresholdless. This asymmetry is readily achievable when an external magnetic field with a strength comparable to the magnetic anisotropy field is applied close to the hard axis. This work establishes a connection between the geometry of the energy profile and nonlinear responses, paving the way for designing magnonic devices with controlled harmonic generation and nonlinear spin wave interaction.
@article{arxiv.2602.21796,
title = {Harnessing magnetic anisotropy for nonlinear magnetization precession and spin waves},
author = {P. I. Gerevenkov and L. A. Shelukhin and Ia. A. Filatov and P. A. Dvortsova and A. M. Kalashnikova},
journal= {arXiv preprint arXiv:2602.21796},
year = {2026}
}