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Development of Integrated HTS SQUIDs With a Multilayer Structure and Ramp-Edge Josephson Junctions.
- Source :
- IEEE Transactions on Applied Superconductivity; Jun2009 Part 1 of 3, Vol. 19 Issue 3, p782-785, 4p, 4 Graphs
- Publication Year :
- 2009
-
Abstract
- We have fabricated high-temperature superconductor (HTS) dc superconducting quantum interference devices (SQUIDs) with a multilayer structure and ramp-edge Josephson junctions. For stable operation at 77 K, SmBa<subscript>2</subscript> Cu<subscript>3</subscript> O<subscript>y</subscript> (SmBCO) and La<subscript>0.1</subscript> - Er<subscript>0.95</subscript>Ba<subscript>1.95</subscript>Cu<subscript>3</subscript>O<subscript>y</subscript> (La-ErBCO) films with a T<subscript>c</subscript> above 90 K were employed as materials for the base-electrode and counter-electrode layers, respectively. Junctions were fabricated by employing a Cu-poor La-ErBCO layer as a precursor of the barrier. The fabricated parallel gradiometers with a baseline of 1-3 mm exhibited the field-induced modulation voltage of 20-50 μV at 77 K, and a clear modulation up to 86.8 K. Noise measurements at 77 K revealed a white flux noise of 4.5-10 μΦ<subscript>0</subscript>/Hz<superscript>1/2</superscript> at 1 kHz. The magnetometer with an integrated 20-turn flux transformer and the effective area of about 1.8 mm<superscript>2</superscript> exhibited a field noise of 25 fT/Hz<superscript>1/2</superscript> or less at 1 kHz. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10518223
- Volume :
- 19
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Applied Superconductivity
- Publication Type :
- Academic Journal
- Accession number :
- 43868814
- Full Text :
- https://doi.org/10.1109/TASC.2009.2019077