Properties of lift-off structured high Tc microbridges


Hauser, B. and Klopman, B. and Blank, D. and Rogalla, H. (1989) Properties of lift-off structured high Tc microbridges. IEEE transactions on magnetics, 25 (2). pp. 919-922. ISSN 0018-9464

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Abstract:Microbridges and DC SQUIDs (superconducting quantum interference devices) were fabricated, using a lift-off technique, from RF sputtered YBaCuO films on MgO single-crystal substrates. Microwave measurements at 9 GHz on microbridges and the magnetic-field dependence of their critical current reveal wide bridge behaviour up to temperatures near the maximum operating temperature of the bridge. Mostly, a linear dependence of the critical current on the temperature is found, which is connected with high intrinsic 1/f noise if the bridge is constant-current-biased slightly above the critical current. In some bridges and DC SQUIDs, regimes with a temperature dependence proportional to (1-T/Tc)1.5 are found. In this case the 1/f noise level is much smaller and SQUID modulation can be followed to about 65 K
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Copyright:© 1989 IEEE
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