Increasing the skyrmion stability in Cu${}_2$OSeO${}_3$ by chemical substitution

Abstract

The cubic chiral helimagnets with the $P{2}_{1}3$ space group represent a group of compounds in which the stable skyrmion-lattice state is experimentally observed. The key parameter that controls the energy landscape of such systems and determines the emergence of a topologically nontrivial magnetic structures is the Dzyaloshinskii-Moriya interaction (DMI). Chemical substitution is recognized as a convenient instrument to tune the DMI in real materials and has been successfully utilized in studies of a number of chiral magnets, such as MnSi, FeGe, MnGe, and others. In our study, we applied small-angle neutron scattering to investigate how chemical substitution influences the skyrmionic properties of an insulating helimagnet Cu${}_2$OSeO${}_3$ when Cu ions are replaced by either Zn or Ni. Our results demonstrate that the DMI is enhanced in the Ni-substituted compounds (Cu,Ni)${}_2$OSeO${}_3$, but weakened in (Cu,Zn)${}_2$OSeO${}_3$. The observed changes in the DMI strength are reflected in the magnitude of the spin-spiral propagation vector and the temperature stability of the skyrmion phase.

arXiv comment10 pages, 5 figures, accepted in PRB

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Cited by in corpus (4)

• Anisotropic fractal magnetic domain pattern in bulk Mn${}_{1.4}$PtSn
• Pinning of Helimagnetic Phase Transitions in Zn-Substituted Skyrmion Host Cu${}_2$OSeO${}_3$
• Robust metastable skyrmions with tunable size in the chiral magnet FePtMo${}_3$N
• Effect of chemical substitution on the skyrmion phase in Cu${}_2$OSeO${}_3$