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We report on the slow magnetization dynamics observed upon the magnetic phasetransitions of GaV4S8, a multiferroic compound featuring a long-rangedcycloidal magnetic order and a N\'eel-type skyrmion lattice in a relativelybroad temperature range below its Curie temperature. The fundamental differencebetween GaV4S8 and the chiral helimagnets, wherein the skyrmion phase was firstdiscovered, lies within the polar symmetry of GaV4S8, promoting a cycloidalinstead of a helical magnetic order and rendering the magnetic phase diagramessentially different from that in the cubic helimagnets. Our ac magneticsusceptibility study reveals slow relaxation dynamics at the field-driven phasetransitions between the cycloidal, skyrmion lattice and field-polarized states.At each phase boundary, the characteristic relaxation times were found toexhibit a strong temperature dependence, starting from the minute range at lowtemperatures, decreasing to the micro- to millisecond range at highertemperatures.

Relaxation dynamics of modulated magnetic phases in skyrmion host GaV4S8: an ac magnetic susceptibility study