Experimental confirmation of curvature-induced effects in magnetic nanosystems

Curvilinear magnetism is the emerging field in micromagnetism which studies influences of external geometry and its topology on magnetic vector fields [1]. Much attention was paid to fundamental theoretical investigations of curvature-induced effects for local [2,3] and non-local magnetic interactions [4], which results in the prediction of various magnetochiral effects [2,5], topologically-induced magnetic patterns [5,6], stabilization of individual skyrmions [7,8] and skyrmion lattices [9] on curvilinear defects. Recently, we provided the very first experimental confirmation and quantitative assessment of the existence of the curvature-induced chiral interaction of exchange origin in a conventional soft ferromagnetic material [10]. In its turn, the interplay between the intrinsic and exchange-induced Dzyaloshinskii-Moriya interaction (DMI) paves the way to a mesoscale DMI [3], whose symmetry and strength depends both on the geometrical and material parameters of the magnetic system. Extending this concept we proposed a novel approach towards artificial magnetoelectric materials with helimagnetic nanohelices embedded in a piezoelectric matrix [11], where electric field could control magnetic states through the utilization of curvature-induced effects. [1] R. Streubel et. al., J. Phys. D: Appl. Phys. 49,363001 (2016). [2] Y. Gaididei et al., Phys. Rev. Lett. 112, 257203 (2014). [3] O. Volkov et al., Sci. Rep. 8, 866 (2018). [4] D. D. Sheka et al., Commun. Phys. 3, 128 (2020). [5] V. P. Kravchuk et al., Phys. Rev. B 85, 144433 (2012). [6] O. V. Pylypovskyi et al., Phys. Rev. Lett. 114, 197204 (2015). [7] V. P. Kravchuk et al., Phys. Rev. B 94, 144402 (2016). [8] O. V. Pylypovskyi et al., Physical Review Applied 10, 064057 (2018). [9] V. P. Kravchuk et al., Phys. Rev. Lett. 120, 067201 (2018). [10] O. M. Volkov et al., Phys. Rev. Lett. 123, 077201 (2019). [11] O. M. Volkov et al., J. Phys. D: Appl. Phys. 52, 345001 (2019).