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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Wellstood, F.C. Kingston, J.J. Ferrari, M.J. Clarke, J. |
| Copyright Year | 1965 |
| Abstract | A three-layer in situ laser deposition process was used to construct superconducting thin-film flux transformers of YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO). The transformers are designed for efficient coupling to a planar thin-film DC SQUID, have 0.7-cm/sup 2/ magnetic field pickup areas, and have ten-turn input coils. When coupled to low transition temperature (T/sub c/) SQUID, the resulting hybrid magnetometer exhibits excess low-frequency flux noise which arises in the transformer. This noise depends on the geometry of the flux transformer, and the observed behavior agrees with model calculations of the expected contribution from flux motion in the YBCO. The hybrid magnetometer attains a magnetic field sensitivity of about 0.9 pTHz/sup -1/2/ at 1 Hz with the transformer at 60 K; the RMS noise decreases as 1/f/sup 1/2/ at 1 Hz up to a frequency f approximately=1 kHz. It is believed that the sensitivity is high enough for use, for example, in magnetocardiography. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 2569 |
| Ending Page | 2572 |
| Page Count | 4 |
| File Size | 472088 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 27 |
| Issue Number | 2 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1991-03-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Transistors Transformers Superconducting thin films Magnetic noise Superconducting device noise Superconducting transition temperature Yttrium barium copper oxide Couplings SQUIDs Magnetic fields |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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