Abstract
Noise properties of single-layer washer-type high- T c YBa 2Cu 3O 7− x rf SQUIDs with 30° grain boundary Josephson junctions have been investigated. We show experimentally that the additional low-frequency noise is produced by the magnetic flux dynamics in the “unwanted” junction in high- T c rf SQUIDs which is formed by the grain boundary running through the washer of the SQUIDs on bicrystal substrates. In order to decrease the low-frequency noise we have designed rf SQUIDs with two strongly asymmetrical Josephson junctions.
Published Version
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