2024/10/25 by Davide Soranzio, Matteo Savoini, Soranzio, Davide +14
Engineering · Physics and Astronomy · #FOS: Physical sciences #Magnetic properties of thin films #Magneto-Optical Properties and Applications #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Optical Systems and Laser Technology
paper · pdf · doi:10.48550/arxiv.2410.19263
openalex publication_date 2024/10/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
FeCr2S4 is a ferrimagnet with two oppositely ordered spin sublattices (Fe and Cr), connected via superexchange interaction, giving a non-zero net magnetic moment. We show, using time-resolved measurements of the magneto-optic Kerr effect, how the magnetic dynamics of the sublattices can be selectively manipulated by resonantly perturbing the Fe sublattice with ultrashort laser pulses. The mid-infrared excitation through intra-atomic Fe d-d transitions triggers markedly slower dynamics in comparison to an off-resonant pumping affecting both of the two sublattices simultaneously. By changing probe wavelength to move in and out of resonance with the Fe d-d transitions, we also show the specific contributions of the Fe sublattice to these dynamics.