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.
@article{arxiv.1903.08377,
title = {Fast domain walls governed by \OE rsted fields in cylindrical magnetic nanowires},
author = {M. Schöbitz and A. De Riz and S. Martin and S. Bochmann and C. Thirion and J. Vogel and M. Foerster and L. Aballe and T. O. Menteş and A. Locatelli and F. Genuzio and S. Le Denmat and L. Cagnon and J. C. Toussaint and D. Gusakova and J. Bachmann and O. Fruchart},
journal= {arXiv preprint arXiv:1903.08377},
year = {2020}
}