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 SM ISO690:2012SEKIGUCHI, Fumiya, BUDZINAUSKAS, Kestutis, PADMANABHAN, Prashant, VERSTEEG, Rolf B., TSURKAN, Vladimir, KEZSMARKI, Istvan, FOGGETTI, Francesco, ARTYUKHIN, Sergey L., VAN LOOSDRECHT, Paul H.M.M.. Slowdown of photoexcited spin dynamics in the non-collinear spin-ordered phases in skyrmion host GaV4S8. In: Nature Communications, 2022, vol. 13, pp. 1-8. ISSN 2041-1723. DOI: https://doi.org/10.1038/s41467-022-30829-z |
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  Nature Communications |
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| Volumul 13 / 2022 / ISSN 2041-1723 | ||||||
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| DOI:https://doi.org/10.1038/s41467-022-30829-z | ||||||
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Formation of magnetic order alters the character of spin excitations, which then affects transport properties. We investigate the photoexcited ultrafast spin dynamics in different magnetic phases in Néel-type skyrmion host GaV4S8 with time-resolved magneto-optical Kerr effect experiments. The coherent spin precession, whose amplitude is enhanced in the skyrmion-lattice phase, shows a signature of phase coexistence across the magnetic phase transitions. The incoherent spin relaxation dynamics slows down by a factor of two in the skyrmion-lattice/cycloid phases, indicating significant decrease in thermal conductivity triggered by a small change of magnetic field. The slow heat diffusion in the skyrmion-lattice/cycloid phases is attributed to the stronger magnon scattering off the domain walls formed in abundance in the skyrmion-lattice/cycloid phase. These results highlight the impact of spatial spin structure on the ultrafast heat transport in spin systems, providing a useful insight for the step toward ultrafast photocontrol of the magnets with novel spin orders. |
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| Cuvinte-cheie diffusion, gallium, magnetic field, thermal conductivity |
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