Low-Tc ramp-type superconductor-insulator-superconductor Josephson junctions

M. Podt; J. Flokstra; H. Rogalla

doi:10.1088/0953-2048/16/12/016

Low-T_c ramp-type superconductor-insulator-superconductor Josephson junctions

M. Podt, J. Flokstra, H. Rogalla

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Abstract

Superconductor–insulator–superconductor Josephson junctions with an area smaller than 1 µm2 are increasingly used for many applications because of their low capacitances and short switching times. The characteristics of analogue and digital SQUIDs, for example, can be improved using small-area Josephson junctions. We have developed Nb/Al, AlO_x/Al/Nb junctions based on an edge geometry. These low-T_c ramp-type junctions allow sub-µm² junction areas using micrometre resolution photolithography. The experimental I–V characteristics of the ramp-type junctions showed non-hysteretic behaviour. Using these ramp-type junctions, the first series of dc SQUIDs have been successfully developed. The characteristics of the ramp-type junctions and the dc SQUIDs have been investigated both experimentally and by using numerical simulations. The white flux noise level of a dc SQUID based on ramp-type junctions with an area of 0.2 µm × 12 µm was measured to be √S_φ = 1.2μφ0Hz^-1/2 .

Original language	English
Pages (from-to)	1394-1398
Number of pages	5
Journal	Superconductor science and technology
Volume	16
Issue number	12
DOIs	https://doi.org/10.1088/0953-2048/16/12/016
Publication status	Published - 2003

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title = "Low-Tc ramp-type superconductor-insulator-superconductor Josephson junctions",

abstract = "Superconductor–insulator–superconductor Josephson junctions with an area smaller than 1 µm2 are increasingly used for many applications because of their low capacitances and short switching times. The characteristics of analogue and digital SQUIDs, for example, can be improved using small-area Josephson junctions. We have developed Nb/Al, AlOx/Al/Nb junctions based on an edge geometry. These low-Tc ramp-type junctions allow sub-µm2 junction areas using micrometre resolution photolithography. The experimental I–V characteristics of the ramp-type junctions showed non-hysteretic behaviour. Using these ramp-type junctions, the first series of dc SQUIDs have been successfully developed. The characteristics of the ramp-type junctions and the dc SQUIDs have been investigated both experimentally and by using numerical simulations. The white flux noise level of a dc SQUID based on ramp-type junctions with an area of 0.2 µm × 12 µm was measured to be √Sφ = 1.2μφ0Hz-1/2 .",

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doi = "10.1088/0953-2048/16/12/016",

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T1 - Low-Tc ramp-type superconductor-insulator-superconductor Josephson junctions

AU - Podt, M.

AU - Flokstra, J.

AU - Rogalla, H.

PY - 2003

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N2 - Superconductor–insulator–superconductor Josephson junctions with an area smaller than 1 µm2 are increasingly used for many applications because of their low capacitances and short switching times. The characteristics of analogue and digital SQUIDs, for example, can be improved using small-area Josephson junctions. We have developed Nb/Al, AlOx/Al/Nb junctions based on an edge geometry. These low-Tc ramp-type junctions allow sub-µm2 junction areas using micrometre resolution photolithography. The experimental I–V characteristics of the ramp-type junctions showed non-hysteretic behaviour. Using these ramp-type junctions, the first series of dc SQUIDs have been successfully developed. The characteristics of the ramp-type junctions and the dc SQUIDs have been investigated both experimentally and by using numerical simulations. The white flux noise level of a dc SQUID based on ramp-type junctions with an area of 0.2 µm × 12 µm was measured to be √Sφ = 1.2μφ0Hz-1/2 .

AB - Superconductor–insulator–superconductor Josephson junctions with an area smaller than 1 µm2 are increasingly used for many applications because of their low capacitances and short switching times. The characteristics of analogue and digital SQUIDs, for example, can be improved using small-area Josephson junctions. We have developed Nb/Al, AlOx/Al/Nb junctions based on an edge geometry. These low-Tc ramp-type junctions allow sub-µm2 junction areas using micrometre resolution photolithography. The experimental I–V characteristics of the ramp-type junctions showed non-hysteretic behaviour. Using these ramp-type junctions, the first series of dc SQUIDs have been successfully developed. The characteristics of the ramp-type junctions and the dc SQUIDs have been investigated both experimentally and by using numerical simulations. The white flux noise level of a dc SQUID based on ramp-type junctions with an area of 0.2 µm × 12 µm was measured to be √Sφ = 1.2μφ0Hz-1/2 .

U2 - 10.1088/0953-2048/16/12/016

DO - 10.1088/0953-2048/16/12/016

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EP - 1398

JO - Superconductor science and technology

JF - Superconductor science and technology

IS - 12

ER -

Low-Tc ramp-type superconductor-insulator-superconductor Josephson junctions

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Low-T_c ramp-type superconductor-insulator-superconductor Josephson junctions