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

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

2010-06-03

arxiv.org/abs/1006.0725v1

Phys. Rev. Lett. 105, 217203 (2010); Editors' Suggestion and see also accompanying Viewpoint in Physics 3, 96 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

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

Scientific paper

10.1103/PhysRevLett.105.217203

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.

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