This title appears in the Scientific Report :
2001
Please use the identifier:
http://hdl.handle.net/2128/1978 in citations.
Please use the identifier: http://dx.doi.org/10.1109/77.919604 in citations.
1/f noise characteristics of SEJ Y-Ba-Cu-O rf-SQUIDs on LaAlO3 substrate and the step structure, film and temperature dependence
1/f noise characteristics of SEJ Y-Ba-Cu-O rf-SQUIDs on LaAlO3 substrate and the step structure, film and temperature dependence
Step edge junction (SEJ) rf-SQUID magnetometers and gradiometers were fabricated using PLD Y-Ba-Cu-O films on LaAlO3(100) and SrTiO2(100) substrates. Effects of different step structure and the film properties on the yield, optimal operating temperature, and the 1/f noise of the SQUIDs were investig...
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Personal Name(s): | Fardmanesh, M. |
---|---|
Schubert, J. / Akram, R. / Bick, M. / Zhang, Y. / Banzet, M. / Zander, W. / Krause, H.-J. / Burkhart, H. / Schilling, M. | |
Contributing Institute: |
Institut für Bio- und Chemosensoren; ISG-2 Institut für Halbleiterschichten und Bauelemente; ISG-1 |
Published in: | IEEE transactions on applied superconductivity, 11 (2001) S. 1363 |
Imprint: |
New York, NY
IEEE
2001
|
Physical Description: |
1363 |
DOI: |
10.1109/77.919604 |
Document Type: |
Journal Article |
Research Program: |
Ionentechnik Schichtsysteme und Bauelemente der Supraleiterelektronik |
Series Title: |
IEEE Transactions on Applied Superconductivity
11 |
Subject (ZB): | |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1109/77.919604 in citations.
Step edge junction (SEJ) rf-SQUID magnetometers and gradiometers were fabricated using PLD Y-Ba-Cu-O films on LaAlO3(100) and SrTiO2(100) substrates. Effects of different step structure and the film properties on the yield, optimal operating temperature, and the 1/f noise of the SQUIDs were investigated. The step structure was controlled using various IBE processes, The devices on LaAlO3 showed higher sensitivity to the step structure compared to those on SrTiO3. This was due to re-deposition of substrate material at the steps prepared using the conventional IBE process resulting in a very low yield of unstable SQUIDs. High yield of low lif noise stable SQUIDs was obtained on LaAlO3 substrates with sharp steps prepared using an optimized IBE process. A typical 1/f noise corner frequency of about 10Hz at 77K with two major temperature dependencies was obtained. The temperature dependencies of the 1/f noise could be correlated to the junction and the film of washer area of the SQUIDs, The white noise of our devices showed a dependency mainly on the amplitude of the flux to voltage transfer function signal. The operating temperature range of the SQUIDs could be controlled by the step structure and narrowed when the optimal operating temperature range was increased. All the measured junctions of our devices on the modified steps showed RSJ type behavior with a moderate decrease of the R, versus temperature. |