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Magnetic skyrmions are vortex-like topological spin textures often observedin structurally chiral magnets with Dzyaloshinskii-Moriya interaction. Amongthem, Co-Zn-Mn alloys with a $\beta$-Mn-type chiral structure host skyrmionsabove room temperature. In this system, it has recently been found thatskyrmions persist over a wide temperature and magnetic field region as along-lived metastable state, and that the skyrmion lattice transforms from atriangular lattice to a square one. To obtain perspective on chiral magnetismin Co-Zn-Mn alloys and clarify how various properties related to the skyrmionvary with the composition, we performed systematic studies onCo$_{10}$Zn$_{10}$, Co$_9$Zn$_9$Mn$_2$, Co$_8$Zn$_8$Mn$_4$ andCo$_7$Zn$_7$Mn$_6$ in terms of magnetic susceptibility and small-angle neutronscattering measurements. The robust metastable skyrmions with extremely longlifetime are commonly observed in all the compounds. On the other hand,preferred orientation of a helimagnetic propagation vector and its temperaturedependence dramatically change upon varying the Mn concentration. Therobustness of the metastable skyrmions in these materials is attributed totopological nature of the skyrmions as affected by structural and magneticdisorder. Magnetocrystalline anisotropy as well as magnetic disorder due to thefrustrated Mn spins play crucial roles in giving rise to the observed change inhelical states and corresponding skyrmion lattice form.

Metastable skyrmion lattices governed by magnetic disorder and anisotropy in $\beta$-Mn-type chiral magnets