The Temperature Dependence of High-TC SQUID Magnetometers
Abstract
We have investigated the response of the flux-locked output of several high-TC SQUID magnetometers to small changes in temperature and for magnetic fields 0-30 μ T. The temperature response DT ≡ d φS /dT is observed to be linear in the applied magnetic field Ba and can be as large as 500 m φo /K where φS is the flux through the SQUID loop and φo is the flux quantum. Our measurements can be explained using a simple model that takes into account the geometry of a given device and is based on the idea that DT is due to the temperature dependence of the superconducting penetration depth. Our results can be used to optimize device performance in applications where the noise of a device is dominated by ambient temperature fluctuations. (Research supported in part by the Office of Naval Research)
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 1997
- Bibcode:
- 1997APS..MAR.A1009K