Bonding of a niobium wire to a niobium thin film

W. Jaszczuk; H.J.M. ter Brake; J. Flokstra; D. Veldhuis; R. Stammis; H. Rogalla

doi:10.1088/0957-0233/2/11/023

Bonding of a niobium wire to a niobium thin film

W. Jaszczuk, H.J.M. ter Brake, J. Flokstra, D. Veldhuis, R. Stammis, H. Rogalla

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Abstract

A method for bonding a niobium wire to a niobium thin film is described. The bonds are to be used as superconducting connections between wire-wound gradiometers and thin-film coupling coils on DC SQUIDS. The method is characterized by two steps. Firstly, the hardness of the niobium wire is reduced by a heat treatment. Secondly, the niobium film is covered with a thin layer of palladium to prevent it from oxidizing. Superconducting bonds were realized using an ultrasonic bonding technique. We tested the bonds and measured superconductivity (to a sensitivity level of 6 × 10-15 Ohm) with currents up to 80 mkA, which is equivalent to 10 times the dynamic range of the DC SQUID systems. Even at 80 mkA, limited by the measuring set-op, the critical current of the bonds is not reached

Original language	English
Pages (from-to)	1121-1122
Number of pages	2
Journal	Measurement science and technology
Volume	2
Issue number	2
DOIs	https://doi.org/10.1088/0957-0233/2/11/023
Publication status	Published - 1991

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title = "Bonding of a niobium wire to a niobium thin film",

abstract = "A method for bonding a niobium wire to a niobium thin film is described. The bonds are to be used as superconducting connections between wire-wound gradiometers and thin-film coupling coils on DC SQUIDS. The method is characterized by two steps. Firstly, the hardness of the niobium wire is reduced by a heat treatment. Secondly, the niobium film is covered with a thin layer of palladium to prevent it from oxidizing. Superconducting bonds were realized using an ultrasonic bonding technique. We tested the bonds and measured superconductivity (to a sensitivity level of 6 × 10-15 Ohm) with currents up to 80 mkA, which is equivalent to 10 times the dynamic range of the DC SQUID systems. Even at 80 mkA, limited by the measuring set-op, the critical current of the bonds is not reached",

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T1 - Bonding of a niobium wire to a niobium thin film

AU - Jaszczuk, W.

AU - ter Brake, H.J.M.

AU - Flokstra, J.

AU - Veldhuis, D.

AU - Stammis, R.

AU - Rogalla, H.

PY - 1991

Y1 - 1991

N2 - A method for bonding a niobium wire to a niobium thin film is described. The bonds are to be used as superconducting connections between wire-wound gradiometers and thin-film coupling coils on DC SQUIDS. The method is characterized by two steps. Firstly, the hardness of the niobium wire is reduced by a heat treatment. Secondly, the niobium film is covered with a thin layer of palladium to prevent it from oxidizing. Superconducting bonds were realized using an ultrasonic bonding technique. We tested the bonds and measured superconductivity (to a sensitivity level of 6 × 10-15 Ohm) with currents up to 80 mkA, which is equivalent to 10 times the dynamic range of the DC SQUID systems. Even at 80 mkA, limited by the measuring set-op, the critical current of the bonds is not reached

AB - A method for bonding a niobium wire to a niobium thin film is described. The bonds are to be used as superconducting connections between wire-wound gradiometers and thin-film coupling coils on DC SQUIDS. The method is characterized by two steps. Firstly, the hardness of the niobium wire is reduced by a heat treatment. Secondly, the niobium film is covered with a thin layer of palladium to prevent it from oxidizing. Superconducting bonds were realized using an ultrasonic bonding technique. We tested the bonds and measured superconductivity (to a sensitivity level of 6 × 10-15 Ohm) with currents up to 80 mkA, which is equivalent to 10 times the dynamic range of the DC SQUID systems. Even at 80 mkA, limited by the measuring set-op, the critical current of the bonds is not reached

U2 - 10.1088/0957-0233/2/11/023

DO - 10.1088/0957-0233/2/11/023

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JO - Measurement science and technology

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Bonding of a niobium wire to a niobium thin film

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