| Zugriffsnummer | 28988 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Low noise YBa2CU3O7-X single layer dc SQUID magnetometer based on bicrystal junctions with 30° misorientation angle |
| Autor(in); Institution |
Beyer, Jörn; 7.13, Kryosensorik, PTB-Berlin
Drung, Dietmar; 7.13, Kryosensorik, PTB-Berlin
Ludwig, Frank; 7.13, Kryosensorik, PTB-Berlin
Minotani, F.; Department of Electronic Device Engineering, Kyushu University, Fukuoka, JAPAN
Enpuku, K.; Department of Electronic Device Engineering, Kyushu University, Fukuoka, JAPAN
|
| Quelle/Jahr | Applied Physics Letters: 72 (1998), 2, 203 - 206 |
| ISSN | 0003-6951 (PRINT) ; 1077-3118 (ONLINE) |
| DOI | |
| Verlag | Melville, NY: American Institute of Physics |
| Klassifikationscode | PACS: 07.55.Ge ; PACS: 85.25.Dq ; PACS: 74.72.-h ; PACS: 87.50.C- ; PACS: 74.78.-w ; PACS: 07.50.Hp ; PACS: 81.15.Cd ; PACS: 81.65.Cf ; PACS: 87.63.Hg |
| Zusammenfassung | We have fabricated and characterized a low-noise direct-coupled magnetometer based on a 100 pH YBa2Cu3O7−x dc superconducting quantum interference device (SQUID) on a 10 mm×10 mm SrTiO3 bicrystal substrate with 30° misorientation angle. The thin films were deposited by hollow cathode discharge sputtering and patterned using conventional photolithography and Ar ion beam etching. The SQUID magnetometer was operated using direct-coupled flux-locked-loop electronics with bias reversal. The sensor had a usable voltage swing of 39 μV and a white magnetic field noise of 32 fTHz−1/2 with a 1/f corner at 2 Hz, including electronics and environmental noise. The voltage versus flux (V−Φ) characteristic showed a pronounced distortion on the negative slope. Numerical simulations were performed to explain the distorted V−Φ characteristic. Measurements of magnetocardiograms demonstrate the suitability of this sensor for biomagnetic applications. |
