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High performance dc SQUID magnetometers with single layer YBa2Cu3O7-x flux transformers

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8 Author(s)
Koelle, D. ; Department of Physics, University of California, Berkeley, California 94720Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 ; Miklich, A.H. ; Dantsker, E. ; Ludwig, F.
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We have fabricated high‐transition temperature superconducting magnetometers involving a flux transformer patterned in a single film of YBa2Cu3O7-x (YBCO) on a 50‐mm‐diam substrate. This transformer is inductively coupled to a loop that in turn is directly coupled to a dc superconducting quantum interference device, patterned in a single layer of YBCO deposited on a SrTiO3 bicrystal. At 77 K, the lowest magnetic field noise achieved is 31 fT Hz-1/2 at frequencies above 5 Hz, increasing to 39 fT Hz-1/2 at 1 Hz.

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Applied Physics Letters  (Volume:63 ,  Issue: 26 )