Imaging magnetic vortex configurations in ferromagnetic nanotubes

We image the remnant magnetization configurations of CoFeB and permalloy nanotubes (NTs) using x-ray magnetic circular dichroism photoemission 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 ratio of the NT’s length and diameter.


Published in:
Physical Review B Condensed Matter, 96, 024423
Year:
2017
Publisher:
College Pk, American Physical Society
ISSN:
0163-1829
Keywords:
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 Record created 2017-07-17, last modified 2018-03-18

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