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We investigate the impact of non-collinear dual optical excitation on themagnetization precession in a permalloy thin film using two ultrashort laserpulses. By analyzing the magnetization dynamics using time-resolvedmagneto-optical methods, we find that the excitation with two ultrashortoptical pulses introduces a long-lasting modification of the electron systemseen as a sizable decrease of the precession frequency and significant increase(about 25%) of the decay time. Our results reveal that the observed effectstrongly depends on the respective polarization of the two excitation pulsesand the time delay between two optical pulses. Our findings indicate theoccurrence of a new nonlinear opto-spin effect during photoexcitation with twointerfering optical pulses which can potentially be observed in variousmaterials and at different photon wavelengths.

Magnetization precession after non-collinear dual optical excitation