Low-Noise, Single-Layer YBa2Cu3O7.x DC SQUID Magnetometers at 77 K

Robin Cantor, Luke P. Lee, Mark Teepe, Vladimir Vinetskiy, Joseph Longo

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We describe a low-noise dc Superconducting QUantum Interference Device (SQUID) magnetometer that is fabricated from a single layer of YBa2Cu3O7-x on a 2 cm x 2 cm bicrystal substrate. The magnetometer design consists of a single-turn pickup loop that is directly coupled to a low inductance SQUID. Using conventional flux-locked loop electronics with bias current reversal, the white flux noise of several of these magnetometers operated at 77 K is observed to be as low as 2.2 above 10 kHz, increasing to about 5.7 at 1 Hz. The field-to-flux conversion efficiency is measured to be 4.6 nT/Φo, resulting in a white magnetic field noise of 10 fT/ above 10 kHz, increasing to 26 at 1 Hz.

Original languageEnglish
Pages (from-to)2927-2930
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
StatePublished - Jun 1995

Bibliographical note

Funding Information:
Manuscript received October 17,1994. This work was supported in part by the Coastal Systems Station Dahlgren Div., Naval Surface Warfare Center, under Contract No. N61331-94-C-0049.


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