Domain wall damped harmonic oscillations induced by curvature gradients in elliptical magnetic nanowires

BITTENCOURT, G.H.R.; CASTILLO-SEPÚLVEDA, S.; CHUBYKALO-FESENKO, O.; MORENO, R.; ALTBIR, D.; CARVALHO-SANTOS, V.L.

Physical Review B

American Physical Society

Año: 2022 vol. 106

2469-9950

This paper focuses on the dynamics of a domain wall (DW) displacing along an elliptically bent nanowire (NW) under the action of spin-polarized electric currents and external magnetic fields. Our results evidence that a curvature gradient induces an exchange-driven effective tangential field responsible for pinning a DW at the maximum curvature point in the NW. However, the competition between the torques produced by the external stimuli and the curvature-induced effective fields changes the DW equilibrium position and phase. Therefore, when the external stimuli are below a certain threshold, the DW follows a damped harmonic oscillation around the new equilibrium position. Above this threshold, DW displaces along the NW under an oscillatory translational motion.