Direct detection of the magnetic flux noise from moving vortices in wide YBa[sub 2]Cu[sub 3]O[sub 7-δ] grain boundary junctions

Hirano, S.; Oyama, H.; Kuriki, S.; Morooka, T.; Nakayama, S.
March 2001
Applied Physics Letters;3/19/2001, Vol. 78 Issue 12, p1715
Academic Journal
We measured the flux of a wide bicrystal grain boundary of YBa[sub 2]Cu[sub 3]O[sub 7-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.


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