Distributed microwave damping filters for superconducting quantum interference devices

Journal Article · Tue Apr 01 00:00:00 EST 1997 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.119036· OSTI ID:563153

Jin, I; Amar, A; Wellstood, F C ^[1]

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1. Department of Physics, Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742-4111 (United States)

We describe a distributed thin-film filter for the broad-band damping of microwave resonances in thin-film superconducting strip lines and coils used in Nb{endash}Al/AlO{sub x}{endash}Nb superconducting quantum interference devices (SQUIDs). The filter consists of an array of 14 {mu}m diameter thin-film Au{endash}Cu dots which are insulated from the strip lines or coils by an SiO{sub 2} layer. Damping occurs via eddy current induced in the dots. Our measurements show that the filter removes resonance steps from the current{endash}voltage curves of SQUIDs which are coupled to the coils and reduces white noise associated with the resonances. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 563153
• Journal Information: Applied Physics Letters, Vol. 70, Issue 16; Other Information: PBD: Apr 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
SQUID DEVICES
ELECTRIC FILTERS
ALUMINIUM ALLOYS
DAMPING
GOLD ALLOYS
COPPER ALLOYS
EDDY CURRENTS
THIN FILMS
NIOBIUM ALLOYS
MICROWAVE RADIATION
NOISE
ALUMINIUM OXIDES
TYPE-II SUPERCONDUCTORS
NIOBIUM