Properties of lift-off structured high T/sub c/ microbridges
Open Access
- 1 March 1989
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
- Vol. 25 (2) , 919-922
- https://doi.org/10.1109/20.92437
Abstract
Microbridges and dc-SQUIDS were fabricated in lift-off technique from rf sputtered YBaCuO films on MgO single crystal substrates. Microwave measurements at 9GHz on microbridges and the magnetic field depen- dence of their critical current reveal wide bridge be- havior 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 to high intrinsic l/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- TIT )I.' are found. In this case the l/f noise level is muck smaller and SQUID modulation can be follswed to about 65K.Keywords
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