Minimization of Ohmic losses for domain wall motion in a ferromagnetic nanowire

Abstract

We study current-induced domain-wall motion in a narrow ferromagnetic wire. We propose a way to move domain walls with a resonant time-dependent current which dramatically decreases the Ohmic losses in the wire and allows to drive the domain wall with higher speed without burning the wire. For any domain wall velocity we find the time-dependence of the current needed to minimize the Ohmic losses. Below a critical domain-wall velocity specified by the parameters of the wire the minimal Ohmic losses are achieved by dc current. Furthermore, we identify the wire parameters for which the losses reduction from its dc value is the most dramatic.

arXiv comment4 pages (+ 4 pages of supplementary material), 4 figures

References in corpus (5)

• Micromagnetic understanding of current-driven domain wall motion in patterned nanowires
• Real-space observation of current-driven domain wall motion in submicron magnetic wires
• Current-spin coupling for ferromagnetic domain walls in fine wires
• Current driven magnetization dynamics in ferromagnetic nanowires with Dzyaloshinskii-Moriya interaction
• Effects of Disorder and Internal Dynamics on Vortex Wall Propagation

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