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. 2016 Apr 13;6:24189. doi: 10.1038/srep24189

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Topography (a) and MFM images (b–d) of a polycrystalline core-shell nanowire (20 min annealing). (b,c) at remanence after saturation in opposite directions parallel to the length of the nanowire. (d) Multi-domain state at 1.05 kOe external magnetic field. The schematics in (b–d) show the magnetization direction (arrows) and domain wall positions (ellipses).