Magnetometers based on double relaxation oscillation superconducting quantum interference devices
- 24 April 1995
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 66 (17) , 2274-2276
- https://doi.org/10.1063/1.113190
Abstract
Magnetometers based on double relaxation oscillationsuperconducting quantum interference devices (SQUIDs) (DROSs) have been fabricated and characterized. The DROSs are based on 2×2 μm2 Nb/AlO x tunnel junctions and have a 25 turn, tightly coupled input coil. The high flux‐to‐voltage transfer coefficient of 1–2 mV/φ0 facilitates direct voltage readout by a low‐noise dc amplifier. The pickup coil consists of a thin‐film Nbgradiometer with a baseline of 40 mm and an inductance of 110 nH. The white field noise of the magnetometer was better than 5 ft/√Hz, which is sufficient for magnetoencephalography measurements.Keywords
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