Flux-closure domains in high aspect ratio electroless-deposited CoNiB nanotubes

Abstract : We report the fabrication and magnetic imaging of high-aspect ratio CoNiB nanotubes. With XMCD-PEEM we evidence multiple magnetic domains and domain walls in these nanotubes. Surprisingly, magnetization in the domains is orthoradial (azimuthal, vortex-like), a situation not anticipated by theory for long nanotubes. The material is therefore technologically appealing for a dense 3D magnetic device such as the racetrack memory (based on shifting magnetic walls), as flux-closure domains should efficiently prevent cross-talk related to internal dipolar fields. Further, we show tuning of a growth-induced anisotropy and thus of the magnetic state of the tube by annealing.
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Submitted on : Monday, April 24, 2017 - 11:00:00 AM
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Michal Staňo, Sandra Schaefer, Alexis Wartelle, Maxime Rioult, Rachid Belkhou, et al.. Flux-closure domains in high aspect ratio electroless-deposited CoNiB nanotubes. SciPost Physics, 2018, 5 (4), pp.038. ⟨10.21468/SciPostPhys.5.4.038⟩. ⟨hal-01512662⟩

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