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Fabrication of superconducting nanowires from ultrathin MgB2
films via focused ion beam milling
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High quality superconducting nanowires were fabricated from ultrathin MgB2
films by a focused ion beam
milling technique. The precursor MgB2
films in 10 nm thick were grown on MgO substrates by using a hybrid physical-chemical vapor deposition method. The nanowires, in widths of about 300-600 nm and lengths of 1 or 10 μm, showed high superconducting critical temperatures (Tc
’s) above 34 K and narrow superconducting transition widths (ΔTc
’s) of 1-3 K. The superconducting critical current density Jc
of the nanowires was above 5 × 107 A/cm2 at 20 K. The high Tc
, narrow ΔTc
, and high Jc
of the nanowires offered the possibility of making MgB2-based nano-devices such as hot-electron bolometers and superconducting nanowire single-photon detectors with high operating temperatures at 15-20 K.
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