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http://dx.doi.org/10.5369/JSST.2004.13.2.110

Designs and Fabrications of High-TC SQUID Magnetometer for Measuring a Weak Signal without Magnetic Shielding  

Yu, K.K. (Korea Research Institute of Standards and Science)
Kim, I.S. (Korea Research Institute of Standards and Science)
Park, Y.K. (Korea Research Institute of Standards and Science)
Publication Information
Journal of Sensor Science and Technology / v.13, no.2, 2004 , pp. 110-113 More about this Journal
Abstract
We have designed and fabricated the YBCO single layer directly-coupled SQUID magnetometers for the purpose of magnetocardiography in a magnetically disturbed environment. The SQUID magnetometers were designed three different types of pickup coil such as solid type, PL type I and PL type II for further stable fluxed-locked-loop operation without magnetic shielding. Magnetometer was fabricated with a single layer YBCO thin film deposited on STO(100) bicrystal substrate with misorientation angle of $30^{\circ}$. We have achieved a magnetic field noise BN of 30 fT/$Hz^{1/2}$ at 100 Hz, and less than 70 fT/$Hz^{1/2}$ at 1 Hz. The PL type II SQUIDs have exhibited the most stable fluxed-locked-loop operation in a magnetically unshielded environment.
Keywords
YBCO thin film; SQUID magnetometer; magnetocardiography;
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