Cycloidally modulated magnetic order stabilized by thermal fluctuations in the Néel-type skyrmion host GaV${}_4$S${}_8$

Abstract

We report small-angle neutron scattering studies of the lacunar spinel GaV${}_4$S${}_8$, which reveal the long-wavelength magnetic states to be cycloidally modulated. This provides direct support for the formation of Néel-type skyrmions recently claimed to exist in this compound. In striking contrast with all other bulk skyrmion host materials, upon cooling the modulated magnetic states transform into a ferromagnetic state. These results indicate all of the modulated states in GaV${}_4$S${}_8$, including the skyrmion state, gain their stability from thermal fluctuations, while at lower temperature the ferromagnetic state emerges in accord with the strong easy-axis magnetic anisotropy. In the vicinity of the transition between the ferromagnetic and modulated states, both a phase coexistence and a soliton-like state are also evidenced by our study.

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• Direct observation of cycloidal spin modulation and field-induced transition in Néel-type skyrmion-hosting VOSe${}_2$O${}_5$
• Optically driven collective spin excitations and magnetization dynamics in the Néel-type skyrmion host GaV${}_4$S${}_8$
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• Magnetoelectric Cavity Magnonics in Skyrmion Crystals
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• Investigation of the magnetic ground state of GaV${}_4$S${}_8$ using powder neutron diffraction
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• Uniaxial polarization analysis of bulk ferromagnets: Theory and first experimental Results
• Magnetic structure of polar magnet GaV${}_4$Se${}_8$ with Néel-type skyrmion lattice probed by ${}^{51}$V NMR
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