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Magnetic skyrmions in chiral-lattice ferromagnets are currently attractingenormous research interest because of their potential applications inspintronic devices. However, they emerge in bulk specimens only in a narrowwindow of temperature and magnetic field. This limited stability regime isrecognized as an obstacle to technical applications. Recent experimentsdemonstrated that the thermodynamic stability of magnetic skyrmions is enhancedor suppressed by the application of a uniaxial strain depending on its axialdirection in bulk chiral-lattice ferromagnets MnSi [Y. Nii et al., Nat. Commun.6, 8539 (2015), A. Chacon et al., Phys. Rev. Lett. 115, 267202 (2015)] andCu2OSeO3 [S. Seki et al., Phys. Rev. B 96, 220404(R) (2017)]. Motivated bythese experimental discoveries, we theoretically investigated the effects ofanisotropic Dzyaloshinskii--Moriya interactions on the stability of magneticskyrmions caused by this uniaxial strain. We find that magnetic skyrmions aresignificantly stabilized (destabilized) in the presence of anisotropic DMinteractions when an external magnetic field lies perpendicular (parallel) tothe anisotropy axis, along which the DM coupling is strengthened. Our resultsaccount completely for the experimentally observed strain-induced stabilizationand destabilization of magnetic skyrmions and provide a firm ground forpossible strain engineering of skyrmion-based electronic devices.

physical review materials

Theoretical study on stabilization and destabilization of magnetic  skyrmions by uniaxial-strain-induced anisotropic Dzyaloshinskii--Moriya  interactions