Domain walls in 3D sinudoidal-shaped nanoarchitectures

The scientific and technological exploration of curvilinear magnetism is an emerging research field that opens the path to exciting novel physical phenomena, originated from the increased complexity in spin textures, topology and frustration, especially in three dimensions.

By tailoring curvature and geometry of conventional magnetic materials, there appears a possibilities to control the material response or to even launch new functionalities. The effects produced by curvatures are multiple and intriguing. Indeed, the curved geometry leads to many novel and non-trivial magnetic phenomena like the appearance of geometry-governed anisotropy and Dzyaloshinkii-Moriya interactions with no need of special materials, the emergence of novel topologically non-trivial textures, the symmetry breaking of domain wall (DW) dynamics or the domain wall auto-motion in local curvature gradient.

Although there are numerous appealing theoretical predictions of curvature-induced effects, the novel physics is explored theoretically for simple situations only and practically is not explored experimentally. The present proposal aims at the investigation of novel functionalities of 3D
magnetic nanoarchitectures. For our proposal, we have chosen to study simple geometries, i.e. 3D sinusoidal functions with variations in the parameters, feature curvature driven effects. The proposed study consists on inducing a domain wall at the maxima of the parabolic architecture after the application
of an out-of-plane saturating field. Imaging the remanent states and studying its depinning fields after application of in-plane fields, will shed light on the type of domains and the effects that the broken spatial symmetry causes on 3D magnetic nanostructures fabricated by two-photon polymerization.