Optically-induced frequency up-conversion of the ferromagnetic resonance in an ultrathin garnet
Lucile Soumah,
Davide Bossini,
Abdelmadjid Anane
et al.
Abstract:We perform ultrafast pump-probe measurements on a nanometer-thick crystalline Bi-doped yttrium iron garnet film with perpendicular magnetic anisotropy. Tuning the photon energy of the pump laser pulses above and below the material's bandgap, we trigger ultrafast optical and spin dynamics via both one-and two-photon absorption. Contrary to the common scenario, the opticallyinduced heating of the system induces an increase up to 20% of the ferromagnetic resonance frequency. We explain this unexpected result in t… Show more
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