  Since its proposal, the idea to vastly increase data storage density with a
magnetic non-volatile 3D shift-register has sustained interest in
current-induced domain wall (DW) motion. So far, experimental efforts have
focused on flat nanostrips, which exhibit a wide range of noteworthy effects,
yet suffer from intrinsic DW instabilities limiting their mobility. In
contrast, ferromagnetic cylindrical nanowires (NWs) can host a novel type of
magnetic DW, namely the Bloch-point wall (BPW), which due to its specific 3D
topology should not experience the same fundamental issue. This could give rise
to DW velocities over ~1000 m/s and fascinating new physics including coupling
to magnetic spin waves, however, experimental evidence of DW dynamics in NWs is
lacking until now. Here we report experimental results on current-induced DW
motion in NWs with velocities >600 m/s, quantitatively consistent with
predictions. Furthermore, our results indicate that although previously
disregarded, the OErsted field induced by the current plays instead a crucial
and valuable role in stabilising exclusively BPWs.
