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Using spin currents generated by fs laser pulses, we demonstrate excitationof GHz ferromagnetic resonance and THz ferrimagnetic exchange resonances inCo/Gd/Co/Gd multilayers by time-resolved magneto-optic Kerr effectmeasurements. Varying the Gd layer thickness allows for a tuning of theresonance spectrum by manipulating the total angular momentum and strength ofeffective exchange fields between the antiferromagnetically coupled layers.Close to the compensation point of angular momentum, a minimum in the frequencyof the exchange-dominated mode and a maximum in the frequency of theferromagnetic resonance mode is observed. Finally, to gain better understandingof the excitation mechanism, we analyze the anomalous variation in the measuredexchange mode amplitude as a function of its frequency. A peak in thisamplitude in the vicinity of the compensation point of angular momentum isexplained using a macrospin model, taking nonlinear effects at finiteprecession amplitudes into account.

Exploring terahertz-scale exchange resonances in synthetic ferrimagnets with ultrashort optically induced spin currents