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We present time-resolved measurements of the displacement of magneticdomain-walls (DWs) driven by vertical spin-polarized currents in track-shapedmagnetic tunnel junctions. In these structures we observe very high DWvelocities (600 m/s) at current densities below $10^7 A/cm^2$. We show that theefficient spin-transfer torque combined with a short propagation distanceallows to avoid the Walker breakdown process, and achieve deterministic,reversible and fast ($\approx$ 1 ns) DW-mediated switching of magnetic tunneljunction elements, which is of great interest to the implementation of fastDW-based spintronic devices.

Time-resolved observation of fast domain-walls driven by vertical spin currents in short tracks