Stripped wires: Multifunctional (magnetic and optical) iron–gold barcode nanowires were electrochemically fabricated using nanoporous templates. Structural analysis by TEM elemental line scan and mapping (see images) clearly revealed the well‐separated, bamboo‐like nanostructures composed of Fe and Au strips.

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Gestreifte Drähte: Multifunktionelle (magnetisch und optisch) Eisen‐Gold‐Barcode‐Nanodrähte wurden elektrochemisch mithilfe nanoporöser Template hergestellt. Die Strukturanalyse durch TEM‐Elementlinien‐Scan und ‐Kartieren (siehe Bilder) belegt eindeutig die gut getrennten, bambusartigen Nanostrukturen aus Fe‐ und Au‐Streifen.

Superior mechanical properties of nanolayered structures have attracted great interest recently. However, previously fabricated multilayer metallic nanostructures have high strength under compressive load but never reached such high strength under tensile loads. Here, we report that our microalloying-based electrodeposition method creates a strong and stable Ni/Ni-Au multilayer nanocrystalline structure by incorporating Au atoms that makes nickel nanowires (NWs) strongest ever under tensile loads even with diameters exceeding 200 nm. When the layer thickness is reduced to 10 nm, the tensile strength reaches the unprecedentedly high 7.4 GPa, approximately 10 times that of metal NWs with similar diameters, and exceeding that of most metal nanostructures previously reported at any scale.