Direct-Coupled High Tc DC Superconducting Quantum Interference Device Magnetometers on SrTiO3 Substrate: Theoretical Description and Comparison with Experiment

Autor:	Fumio Shiraishi, Tadashi Minotani, Keiji Enpuku, Atushi Kandori, Joern Beyer, Dietmar Drung, Frank Ludwig
Rok vydání:	1998
Předmět:	Materials science Condensed matter physics Magnetometer Physics::Medical Physics General Engineering General Physics and Astronomy Resonance LC circuit Noise (electronics) law.invention Inductance SQUID law Scanning SQUID microscopy Condensed Matter::Superconductivity Voltage
Zdroj:	Japanese Journal of Applied Physics. 37:4769
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.37.4769
Popis:	A comprehensive quantitative comparison between the measured performance of direct-coupled high T c superconducting quantum interference device (SQUID) magnetometers with 30° bicrystal junctions and a numerical simulation is presented. It is shown that the characteristics of the SQUID magnetometer are considerably affected by resonances due to the large dielectric constant of the SrTiO3 substrate. In the realized magnetometer layout, the strip line resonance occurring in the SQUID inductance increases the voltage modulation depth and the output voltage noise of the SQUID, while the flux noise of the SQUID is nearly unchanged. It is also shown that the distortion of the voltage versus flux characteristic is caused by the LC resonance in the pickup loop of the magnetometer in combination with a capacitive feedback. Good agreement between experiment and simulation has been obtained.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0e7a47f4af3387fc11c8ba150bc79fc6 https://doi.org/10.1143/jjap.37.4769 Zobrazit plný text záznamu