Scientific Reports 9, 5130, 2019
Modeling magnetic-field-induced domain wall propagation in modulated-diameter cylindrical nanowires
J.A. Fernandez-Roldan, A. De Riz, B. Trapp, C. Thirion, M. Vazquez, J.-C. Toussaint, O. Fruchart and D. Gusakova
doi.org/10.1038/s41598-019-40794-1
Domain wall propagation in modulated-diameter cylindrical nanowires is a key phenomenon studied with a view to designing 3-dimensional magnetic memory devices. This paper presents a theoretical study of transverse domain wall behavior under magnetic field within a cylindrical nanowire with diameter modulation. Particularly, the domain wall pinning close to the diameter modulation was quantified, both numerically, using finite element micromagnetic simulations, and analytically. Qualitative analytical model for gently sloping modulations resulted in a simple scaling law useful to guide nanowire design when analyzing experiments. It shows that the domain wall depinning field is proportional to the modulation slope.
This article derives from the stay of Jose Angel Fernandez Roldan as PhD student in the laboratories of the Institut Louis Néel, Université Grenoble Alpes, CNRS, France supported by the Spanish MINECO within the collaboration established with Prof. Olivier Fruchart.