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Magnetic skyrmions are nano-sized topological spin textures stabilized by adelicate balance of magnetic energy terms. The chemical substitution of theunderlying crystal structure of skyrmion-hosting materials offers a route tomanipulate these energy contributions, but also introduces additional effectssuch as disorder and pinning. While the effects of doping and disorder havebeen well studied in B20 metallic materials such as Fe$_{1-x}$Co$_x$Si andMn$_{1-x}$Fe$_x$Si, the consequences of chemical substitution in themagnetoelectric insulator Cu$_2$OSeO$_3$ have not been fully explored. In thiswork, we utilize a combination of AC magnetometry and small angle neutronscattering to investigate the magnetic phase transition dynamics in pristineand Zn-substituted Cu$_2$OSeO$_3$. The results demonstrate that the first orderhelical-conical phase transition exhibits two thermally separated behaviouralregimes: at high temperatures, the helimagnetic domains transform bylarge-scale, continuous rotations, while at low temperatures, the two phasescoexist. Remarkably, the effects of pinning in the substituted sample are lessprevalent at low temperatures, compared to high temperatures, despite thereduction of available thermal activation energy. We attribute this behaviourto the large, temperature-dependent, cubic anisotropy unique to Cu$_2$OSeO$_3$,which becomes strong enough to overcome the pinning energy at low temperatures.Consideration and further exploration of these effects will be crucial whenengineering skyrmion materials towards future applications.

Pinning of Helimagnetic Phase Transitions in Zn-Substituted Skyrmion Host Cu$_2$OSeO$_3$