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Titolo:
High-Tc SQUID magnetometers for use in moderate magnetically-shielded room
Autore:
Matsuda, M; Ono, S; Kato, K; Matsuura, T; Oyama, H; Hayashi, A; Hirano, S; Kuriki, S; Yokosawa, K;
Indirizzi:
Muroran Inst Technol, Muroran, Hokkaido 050, Japan Muroran Inst Technol Muroran Hokkaido Japan 050 oran, Hokkaido 050, Japan Hokkaido Univ, Res Inst Elect Sci, Sapporo, Hokkaido, Japan Hokkaido UnivSapporo Hokkaido Japan Elect Sci, Sapporo, Hokkaido, Japan Hitachi Ltd, Cent Res Lab, Tokyo, Japan Hitachi Ltd Tokyo JapanHitachi Ltd, Cent Res Lab, Tokyo, Japan
Titolo Testata:
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
fascicolo: 1, volume: 11, anno: 2001,
parte:, 1
pagine: 1323 - 1326
SICI:
1051-8223(200103)11:1<1323:HSMFUI>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUANTUM INTERFERENCE DEVICES; 1/F NOISE; GRADIOMETER; FIELD;
Keywords:
SQUIDs; noise properties; magnetometer; first derivative gradiometer; magnetocardiogram;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
8
Recensione:
Indirizzi per estratti:
Indirizzo: Matsuda, M Muroran Inst Technol, Muroran, Hokkaido 050, Japan Muroran InstTechnol Muroran Hokkaido Japan 050 ido 050, Japan
Citazione:
M. Matsuda et al., "High-Tc SQUID magnetometers for use in moderate magnetically-shielded room", IEEE APPL S, 11(1), 2001, pp. 1323-1326

Abstract

We have fabricated and characterized high-T-c planar SQUID magnetometers and first derivative gradiometers with directly-coupled pickup loops. The devices were made from single layer of YBa2Cu3O7-8 thin film on LSAT bicrystal substrate with 30 degrees or 24 degrees misorientation angle,Magnetic properties were investigated by applying a magnetic field Bo for the SQUID magnetometer patterned with holes to reduce the maximum structural width. We found an increasing Low frequency noise with cooling fields B-0larger than 1.5 muT This value consists with the threshold field estimatedfrom the maximum structural width. A magnetic field noise level of 500 fT/Hz(1/2) at 10 Hz was observed by using PLL electronics with a bias current reversal in a moderate magnetically-shielded room consisting of only two 1mm thick layers of permalloy, Measurements of magnetocardiograms demonstratethe suitability of this magnetometer for biomagnetic applications. On the other hand, the gradiometer with two symmetric pickup loops was operated without any shielding. The performance obtained was a field gradient resolution of about 1 pT/cmHz(1/2) at 1 kHz and 10 pT/cmHz(1/2) at 1 Hz, with a baseline of 4 mm, The imbalance of this gradiometer was around 0.7%, limited by the sensitivity to homogeneous field of the SQUID itself.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/04/20 alle ore 02:17:40