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Browse Journals & Magazines > Applied Physics Letters ...> Volume:78 Issue:12 Help

Direct detection of the magnetic flux noise from moving vortices in wide YBa2Cu3O7-δ grain boundary junctions

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5 Author(s)
Hirano, S. ; Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan ; Oyama, H. ; Kuriki, S. ; Morooka, T.
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We measured the flux of a wide bicrystal grain boundary of YBa2Cu3O7-δ film, cooled to 77 K in a field of 10 μT, using a superconducting thin-film coil and Nb-based superconducting quantum interference device (SQUID). When the applied field was changed to, and above, a small threshold value, the sample showed random switching noises with a sharp increase in low-frequency noise power. The results suggested that there was long-distance movement of vortices over 20–500 μm within the grain boundary, driven by the shielding current. The vortex movement was suppressed to lengths of less than 1 μm in a slotted grain boundary by making an array of SQUIDs that can hold vortices stably. © 2001 American Institute of Physics.

Published in:
Applied Physics Letters  (Volume:78 ,  Issue: 12 )

Date of Publication: Mar 2001

Page(s):
1715 - 1717
ISSN :
0003-6951
Digital Object Identifier :
10.1063/1.1355669
Product Type:
Journals & Magazines
Date of Current Version :
18 June 2009
Issue Date :
Mar 2001

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