Non-Local Vortex Transport in Superconducting W-C Nanowires Grown in a Helium Ion Microscope

Focused Ion Beam Induced Deposition (FIBID) is an additive direct nanopatterning technique that has been used in the past to grow in-plane superconducting nanowires [1]. The lateral resolution of Ga⁺-FIB for patterning is nevertheless a limiting factor to achieve nanowire widths smaller than 50 nm. As it will be shown here, the good lateral resolution of the Helium Ion Microscope (HIM), in combination with the W(CO)₆ precursor material, has allowed us to fabricate W-C superconducting nanowires with width down to 20 nm [2]. In devices based on these nanowires, large electrical voltages arising from non-local vortex transport have been measured. The obtained results will be compared to those observed previously in W-C nanowires grown by Ga⁺-FIBID [3].
[1] R. Córdoba et al., Nature Communications 4, 1437 (2013)
[2] P. Orús et al., manuscript submitted
[3] R. Córdoba et al., Scientific Reports 9, 12386 (2019)