Universality between current- and field-driven domain wall dynamics in ferromagnetic nanowires

Details Universality between current- and field-driven domain wall dynamics in ferromagnetic nanowires Universality between current- and field-driven domain wall dynamics in ferromagnetic nanowires

2009-12-28

arxiv.org/abs/0912.5127v2

Physics

Condensed Matter

Materials Science

This paper has been withdrawn by the authors. New version is available at http://arxiv.org/abs/1006.1216

Scientific paper

Spin-polarized electric current exerts torque on local magnetic spins, resulting in magnetic domain-wall (DW) motion in ferromagnetic nanowires. Such current-driven DW motion opens great opportunities toward next-generation magnetic devices controlled by current instead of magnetic field. However, the nature of the current-driven DW motion--considered qualitatively different from magnetic-field-driven DW motion--remains yet unclear mainly due to the painfully high operation current densities J_OP, which introduce uncontrollable experimental artefacts with serious Joule heating. It is also crucial to reduce J_OP for practical device operation. By use of metallic Pt/Co/Pt nanowires with perpendicular magnetic anisotropy, here we demonstrate DW motion at current densities down to the range of 10^9 A/m^2--two orders smaller than existing reports. Surprisingly the current-driven motion exhibits a scaling behaviour identical to the field-driven motion and thus, belongs to the same universality class despite their qualitative differences. Moreover all DW motions driven by either current or field (or by both) collapse onto a single curve, signalling the unification of the two driving mechanisms. The unified law manifests non-vanishing current efficiency at low current densities down to the practical level, applicable to emerging magnetic nanodevices.

Affiliated with

Also associated with

No associations

Rating

Universality between current- and field-driven domain wall dynamics in ferromagnetic nanowires does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Universality between current- and field-driven domain wall dynamics in ferromagnetic nanowires, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Universality between current- and field-driven domain wall dynamics in ferromagnetic nanowires will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-91594