Reduction of threshold current density for current-driven domain wall motion by shape control

Abstract

We investigated the aspect ratio (thickness/width) dependence of the threshold current density required for the current-driven domain wall (DW) motion for the Ni81Fe19 nanowires. It has been shown theoretically that the threshold current density is proportional to the product of the hard-axis magnetic anisotropy Kperp and the DW width lamda. (Phys. Rev. Lett. 92, 086601 (2004).) We show experimentally that Kperp can be controlled by the magnetic shape anisotropy in the case of the Ni81Fe19 nanowires, and that the threshold current density increases with an increase of Kperp*l. We succeeded to reduce the threshold current density by half by the shape control.

16 pages, 4 figures

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• Theory of Domain Wall Dynamics under Current
• Dynamical pinning of domain wall in magnetic nanowire induced by Walker breakdown
• Influence of Joule heating on current-induced domain wall depinning
• Current-driven dynamics of coupled domain walls in a synthetic antiferromagnet
• Adiabatic and nonadiabatic spin torques induced by spin-triplet supercurrent
• Current-Controlled Nanomagnetic Writing for Reconfigurable Magnonic Crystals