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@ARTICLE{Faley:860441,
      author       = {Faley, M. I. and Reith, P. and Stolyarov, V. S. and
                      Golovchanskiy, I. A. and Golubov, A. A. and Hilgenkamp, H.
                      and Dunin-Borkowski, R. E.},
      title        = {π-{L}oops {W}ith ds {J}osephson {J}unctions},
      journal      = {IEEE transactions on applied superconductivity},
      volume       = {29},
      number       = {5},
      issn         = {1051-8223},
      address      = {New York, NY},
      publisher    = {IEEE},
      reportid     = {FZJ-2019-01195},
      pages        = {1 - 5},
      year         = {2019},
      abstract     = {We fabricated Josephson junctions (JJs) between the d-wave
                      superconductor (SC) YBa 2 Cu 3 O 7 -x (YBCO) and the s-wave
                      SC Nb (ds-JJs) on graphoepitaxially buffered MgO substrates,
                      studied ds-JJs at temperatures down to 30 mK and employed
                      these JJs in π-loops. Current-voltage characteristics of
                      ds-JJs oriented along the [100] axis of YBCO exhibited up to
                      a factor of 200 higher critical current densities than
                      ds-JJs oriented along the [110] axis of YBCO. The critical
                      current Ic and the IcRn product of [100]-oriented 3 μm wide
                      ds-JJs are ∼70 μA and ∼200 μV, respectively, at 4.2 K.
                      Rectangular arrays of up to 40 000 π-loops based on such
                      ds-JJs were investigated using a low temperature scanning
                      superconducting quantum interference device (SQUID)
                      microscope. We observed ordering of spontaneously generated
                      half integer magnetic flux quanta in the π-loops correlated
                      with minute spurious background magnetic fields, as well as
                      with configurations and mutual coupling of the π-loops. We
                      manipulated the magnetic states of the π-loops by the local
                      application of magnetic fields using nearby planar coils.
                      This paper paves the way for the use of π-loops in
                      computations that are based on annealing processes.},
      cin          = {PGI-5},
      ddc          = {620},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {144 - Controlling Collective States (POF3-144) / 143 -
                      Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000457591700001},
      doi          = {10.1109/TASC.2019.2892078},
      url          = {https://juser.fz-juelich.de/record/860441},
}