Bonding of a niobium wire to a niobium thin film

Jaszczuk, W. and Brake ter, H.J.M. and Flokstra, J. and Veldhuis, D. and Stammis, R. and Rogalla, H. (1991) Bonding of a niobium wire to a niobium thin film. Measurement Science and Technology, 2 (11). p. 1121. ISSN 0957-0233

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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
Item Type:	Article
Copyright:	© 1991 Institute of Physics
Faculty:	Science and Technology (TNW)
Research Group:	Energy, Materials and Systems (EMS) Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/60689
Official URL:	http://dx.doi.org/10.1088/0957-0233/2/11/023
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