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

Author

Listed:
  • 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
    Institute of Applied Physics)

  • István Kézsmárki

    (University of Augsburg)

  • Francesco Foggetti

    (Istituto Italiano di Tecnologia
    Dipartimento di Fisica, Università di Genova)

  • Sergey Artyukhin

    (Istituto Italiano di Tecnologia)

  • Paul H. M. Loosdrecht

    (II. Physikalisches Institut, Universität zu Köln)

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.

Suggested Citation

  • Fumiya Sekiguchi & Kestutis Budzinauskas & Prashant Padmanabhan & Rolf B. Versteeg & Vladimir Tsurkan & István Kézsmárki & Francesco Foggetti & Sergey Artyukhin & Paul H. M. Loosdrecht, 2022. "Slowdown of photoexcited spin dynamics in the non-collinear spin-ordered phases in skyrmion host GaV4S8," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30829-z
    DOI: 10.1038/s41467-022-30829-z
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