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We report the imaging of magnetic domains in ferromagnetic CoNiB nanotubeswith very long aspect ratio, fabricated by electroless plating. While axialmagnetization is expected for long tubes made of soft magnetic materials, weevidence series of azimuthal domains. We tentatively explain these by theinterplay of anisotropic strain and/or grain size, with magneto-elasticityand/or anisotropic interfacial magnetic anisotropy. This material could beinteresting for dense data storage, as well as curvature-induced magneticphenomena such as the non-reciprocity of spin-wave propagation.

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