Abstract
The fabrication of self-supported ultrathin metallic wires is described. The initial material is a Pt/Rh (10%) wire embedded inside a 50 μm diameter Ag sheath. The thinning procedure which includes mechanical, chemical, annealing, and ion milling processes, leads to diameters down to 60 nm. Each wire is curved then fixed on a dedicated support suited to all the successive preparation steps. This mechanical attachment permits a precise positioning of such a wire at micrometric distances from a flat surface and therefore, its use as an electron biprism in low-energy electron interferometry experiments. The wire thinning is limited by the creation of cusps on the wire shape.
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