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We combine ultrafast X-ray diffraction (UXRD) and time-resolvedMagneto-Optical Kerr Effect (MOKE) measurements to monitor the strain pulses inlaser-excited TbFe2/Nb heterostructures. Spatial separation of the Nb detectionlayer from the laser excitation region allows for a background freecharacterization of the laser-generated strain pulses. We clearly observesymmetric bipolar strain pulses when the excited TbFe2 surface terminates thesample and a decomposition of the strain wavepacket into an asymmetric bipolarand a unipolar pulse, when a SiO2 glass capping layer covers the excited TbFe2layer. The inverse magnetostriction of the temporally separated unipolar strainpulses in this sample leads to a MOKE signal that linearly depends on thestrain pulse amplitude measured through UXRD. Linear chain model simulationsaccurately predict the timing and shape of UXRD and MOKE signals that arecaused by the strain reflections from multiple interfaces in theheterostructure.

Tracking picosecond strain pulses in heterostructures that exhibit giant magnetostriction