Ultrafast selective mid-infrared sublattice manipulation in the ferrimagnet $FeCr_2S_4$
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arXiv
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| Format: | Preprint |
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2024
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| author | Soranzio, Davide Savoini, Matteo Graf, Fabian Winkler, Rafael T. Nag, Abhishek Ueda, Hiroki Ohgushi, Kenya Tokura, Yoshinori Johnson, Steven L. |
| author_facet | Soranzio, Davide Savoini, Matteo Graf, Fabian Winkler, Rafael T. Nag, Abhishek Ueda, Hiroki Ohgushi, Kenya Tokura, Yoshinori Johnson, Steven L. |
| contents | $FeCr_2S_4$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_19263 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultrafast selective mid-infrared sublattice manipulation in the ferrimagnet $FeCr_2S_4$ Soranzio, Davide Savoini, Matteo Graf, Fabian Winkler, Rafael T. Nag, Abhishek Ueda, Hiroki Ohgushi, Kenya Tokura, Yoshinori Johnson, Steven L. Mesoscale and Nanoscale Physics $FeCr_2S_4$ 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. |
| title | Ultrafast selective mid-infrared sublattice manipulation in the ferrimagnet $FeCr_2S_4$ |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.19263 |