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We present an investigation of the influence of low-levels of chemicalsubstitution on the magnetic ground state and N{\' e}el skyrmion lattice (SkL)state in GaV$_4$S$_{8-y}$Se$_y$, where $y =0, 0.1, 7.9$, and $8$. Muon-spinspectroscopy ($\mu$SR) measurements on $y=0$ and 0.1 materials reveal themagnetic ground state consists of microscopically coexisting incommensuratecycloidal and ferromagnetic environments, while chemical substitution leads tothe growth of localized regions of increased spin density. $\mu$SR measurementsof emergent low-frequency skyrmion dynamics show that the SkL exists underlow-levels of substitution at both ends of the series. Skyrmionic excitationspersist to temperatures below the equilibrium SkL in substituted samples,suggesting the presence of skyrmion precursors over a wide range oftemperatures.

Magnetism and N\'{e}el skyrmion dynamics in GaV$_{4}$S$_{8-y}$Se$_{y}$