Fabrication of superconducting nanowires from ultrathin MgB2 films via focused ion beam milling

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...

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Bibliographic Details
Published in:AIP advances 2015-02, Vol.5 (2), p.027139-027139-8
Main Authors: Zhang, Chen, Wang, Da, Liu, Zheng-Hao, Zhang, Yan, Ma, Ping, Feng, Qing-Rong, Wang, Yue, Gan, Zi-Zhao
Format: Article
Language:English
Subjects:
Bolometers
Borides
Chemical vapor deposition
Critical current density
Ion beams
Magnesium compounds
Nanotechnology devices
Nanowires
Operating temperature
Organic chemistry
Physical vapor deposition
Substrates
Superconductivity
Thick films
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Summary: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.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4914019