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

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

2005-10-24

arxiv.org/abs/cond-mat/0510619v2

Published in Japanese Journal of Applied Physics vol.45 No. 5A,p3850-3853 (2006)

Physics

Condensed Matter

Materials Science

16 pages, 4 figures

Scientific paper

10.1143/JJAP.45.3850

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.

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