Measurement of trapped flux distribution in a high-Tc superconductor using a flux-gate magnetometer

I. Sasada, Y. Oonaka, K. Harada

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Abstract

The distribution of the trapped flux was measured using a miniaturized flux-gate magnetometer with resolution as high as 0.46 mG at 77 K for a BiSrCaCuO high-Tc superconductor cooled down to 77 K in the presence of ac magnetic field (0.5-50 Hz) of 0.6 G in peak-to-peak and in-plane thermal gradient. The amplitude of the trapped flux decreased with increasing the frequency of ac magnetic field. The amplitude was as small as 2 mG for a 50 Hz ac field, and 43 mG for a 0.5 Hz ac field. The amplitude also became small when the cooling rate was made slow. A symbiotic combination of the high-T c superconducting magnetic shield and the ferromagnetic one with magnetic shaking is proposed, in which merits of both can be enhanced.

Original languageEnglish
Pages (from-to)5635-5637
Number of pages3
JournalJournal of Applied Physics
Volume73
Issue number10
DOIs
Publication statusPublished - Dec 1 1993

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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