Ultrafast selective mid-infrared sublattice manipulation in the ferrimagnet FeCr₂S₄
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Date
2025
Publication Type
Working Paper
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yes
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Abstract
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.
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published
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ETH Zurich
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Subject
ferrimagnetic materials; Ultrafast dynamics; Magnetooptical effects
Organisational unit
03920 - Johnson, Steven / Johnson, Steven
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Funding
23-1 SEED-014 - Mid-infrared time-resolved magneto-optics (ETHZ)
Related publications and datasets
Is supplemented by: https://doi.org/10.3929/ethz-b-000722091