We present time-resolved measurements of the displacement of magnetic domain-walls (DWs) driven by vertical spin-polarized currents in track-shaped magnetic tunnel junctions. In these structures we observe very high DW velocities (600 m/s) at current densities below 107A/cm2. We show that the efficient spin-transfer torque combined with a short propagation distance allows to avoid the Walker breakdown process, and achieve deterministic, reversible and fast (≈ 1 ns) DW-mediated switching of magnetic tunnel junction elements, which is of great interest to the implementation of fast DW-based spintronic devices.
@article{arxiv.1309.1002,
title = {Time-resolved observation of fast domain-walls driven by vertical spin currents in short tracks},
author = {Joao Sampaio and Steven Lequeux and Peter J. Metaxas and Andre Chanthbouala and Rie Matsumoto and Kay Yakushiji and Hitoshi Kubota and Akio Fukushima and Shinji Yuasa and Kazumasa Nishimura and Yoshinori Nagamine and Hiroki Maehara and Koji Tsunekawa and Vincent Cros and Julie Grollier},
journal= {arXiv preprint arXiv:1309.1002},
year = {2014}
}