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arXiv · 2205.05716

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

G. H. R. Bittencourt·S. Castillo-Sepúlveda·O. Chubykalo-Fesenko·R. Moreno·D. Altbir·V. L. Carvalho-Santos
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Abstract

Understanding the domain wall (DW) dynamics in magnetic nanowires (NW) is crucial for spintronic-based applications demanding the use of DWs as information carriers. This work focuses on the dynamics of a DW displacing along a bent NW with an elliptical shape 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 near the maximum curvature point in a NW. The DW equilibrium position depends on the competition between the torques produced by the external stimuli and the curvature-induced effective fields. When the external stimuli are below a certain threshold, the DW follows a damped harmonic oscillation around the equilibrium position. Above this threshold, DW displaces along the NW under an oscillatory translational motion.

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G. H. R. Bittencourt, S. Castillo-Sepúlveda, O. Chubykalo-Fesenko, R. Moreno, D. Altbir, V. L. Carvalho-Santos. 2022-05-11. Domain wall damped harmonic oscillations induced by curvature gradients in elliptical magnetic nanowires. https://doi.org/10.1103/physrevb.106.174424

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