  Fabrication of superconducting nanomechanical resonators for quantum
research, detectors and devices traditionally relies on a lithographic process,
resulting in oscillators with sharp edges and a suspended length limited to a
few 100 micrometres. We report a low-investment top-down approach to
fabricating NbTi nanowire resonators with suspended lengths up to several
millimetres and diameters down to 100 nanometres. The nanowires possess high
critical currents and fields, making them a natural choice for magnetomotive
actuation and sensing. This fabrication technique is independent of the
substrate material, dimensions and layout and can readily be adapted to
fabricate nanowire resonators from any metal or alloy with suitable ductility
and yield strength. Our work thus opens access to a new class of nanomechanical
devices with applications including microscopic and mesoscopic investigations
of quantum fluids, detecting dark matter and fundamental materials research in
one-dimensional superconductors in vacuum.
