Slowdown of photoexcited spin dynamics in the non-collinear spin-ordered phases in skyrmion host GaV4S8

Fumiya Sekiguchi (), Kestutis Budzinauskas, Prashant Padmanabhan, Rolf B. Versteeg, Vladimir Tsurkan, István Kézsmárki, Francesco Foggetti, Sergey Artyukhin and Paul H. M. Loosdrecht ()
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Fumiya Sekiguchi: II. Physikalisches Institut, Universität zu Köln
Kestutis Budzinauskas: II. Physikalisches Institut, Universität zu Köln
Prashant Padmanabhan: II. Physikalisches Institut, Universität zu Köln
Rolf B. Versteeg: II. Physikalisches Institut, Universität zu Köln
Vladimir Tsurkan: University of Augsburg
István Kézsmárki: University of Augsburg
Francesco Foggetti: Istituto Italiano di Tecnologia
Sergey Artyukhin: Istituto Italiano di Tecnologia
Paul H. M. Loosdrecht: II. Physikalisches Institut, Universität zu Köln

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract 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.

Date: 2022
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DOI: 10.1038/s41467-022-30829-z

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