Curvature-induced effects in magnetic nanosystems

Curvilinear magnetism is in focus of intensive study, as it allows to tailor chiral and anisotropic responses and stabilize topologically non-trivial magnetic textures at the nanoscale [1]. In curved magnets all energy functionals, that contain spatial derivatives are reshaping in a way of appearance additional curvature-induced chiral and anisotropy terms. Here, we will discuss theoretical and experimental aspects behind the appearance of curvature-induced chiral effects in parabolic nanostripes [2]. We show that a pinning of domain wall at the parabolic apex is originated due to the presence of local curvature-induced chiral term, that could be quantified from the depinning field. The interplay between the intrinsic and extrinsic chiral terms paves the way to a mesoscale one, whose symmetry and strength depend both on the geometrical and material parameters [3]. These concept allows us to propose a novel approach towards artificial ME materials, whose magnetic states could be controled through small geometrical changes of curvature and torsion [4].
[1] R. Streubel et. al., J. Phys. D: Appl. Phys. 49,363001 (2016).
[2] O. Volkov et al.. Phys. Rev. Lett. 123, 077201 (2019).
[3] O. Volkov et al., Sci. Rep. 8, 866 (2018).
[4 ]O. Volkov et al., J. Phys. D: Appl. Phys. 52, 345001 (2019).