Flip-Chip High-T-c DC SQUID Magnetometer With a Ferromagnetic Flux Antennaстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 30 марта 2018 г.
Аннотация:We have combined a flip-chip high-T-c dcSQUID magnetometer with a ferromagnetic flux antenna made from 250 insulated 25-mu m-thick stripes of amorphous soft magnetic Vitrovac 6025 foil inserted through the pick-up loop of the superconducting flux transformer. The ferromagnetic flux antenna provides improved magnetic coupling of the high-T-c SQUID to magnetic fields of similar to 0.4 nT/Phi(0) to similar to 0.18 nT/Phi(0). The orientation of the stripes was chosen to be normal to the foil tape rolling direction in order to minimize contributions from Barkhausen noise. A magnetic field resolution of similar to 2 fT/root Hz at 1 kHz and 77 K was achieved. Details of the technology and noise spectra of the novel composite high-T-c SQUID sensor are presented and their prospective applications for biomagnetic research and nondestructive evaluation are discussed.