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The current-driven motion of magnetic domain walls (DWs) is the workingprinciple of magnetic racetrack memories. In this type of spintronictechnology, high current densities are used to propel DW motion in magneticnanowires, causing significant wire heating. Synthetic antiferromagnets areknown to show very fast DW motion at high current densities, but lower currentdensities around onset of motion have received less attention. Here we usescanning transmission x-ray microscopy to study the response of DWs in a SAFmultilayer to currents. We observe that the DWs depin at $\sim 3 \times10^{11}$~A/m$^2$ and move more quickly in response to 5~ns duration currentpulses than in comparable conventional multilayers. The results suggest thatDWs in SAF structures are superior to conventional N\'{e}el DWs for low energyconsumption racetrack technologies.

Domain wall motion at low current density in a synthetic antiferromagnet nanowire