We image the remnant magnetization configurations of CoFeB and permalloy nanotubes (NTs) using x-ray magnetic circular dichroism photo-emission electron microscopy. The images provide direct evidence for flux-closure configurations, including a global vortex state, in which magnetization points circumferentially around the NT axis. Furthermore, micromagnetic simulations predict and measurements confirm that vortex states can be programmed as the equilibrium remnant magnetization configurations by reducing the NT aspect ratio.
@article{arxiv.1701.01685,
title = {Imaging magnetic vortex configurations in ferromagnetic nanotubes},
author = {M. Wyss and A. Mehlin and B. Gross and A. Buchter and A. Farhan and M. Buzzi and A. Kleibert and G. Tütüncüoglu and F. Heimbach and A. Fontcuberta i Morral and D. Grundler and M. Poggio},
journal= {arXiv preprint arXiv:1701.01685},
year = {2017}
}
Comments
14 pages, 4 figures, link to supplementary information