M.L. Roukes, M.R. Freeman, et al.
Physical Review Letters
We have, for the first time, demonstrated integrated dc superconducting quantum interference devices (SQUIDs) with input coils of linewidth down to 0.5 μm. The SQUID inductance L consists of a single octagonal washer or two or four such washers configured in parallel. The input coil of inductance L i, which couples to L with a mutual inductance of Mi, consists of fine-line octagonal spiral(s) fabricated in close proximity to the washer(s). For a two-washer SQUID with twin 80-turn, 0.5 μm spirals, L i=2.5 μH, Mi=12.7 nH, L=109 pH, and the coupling constant k2=0.85. This entire device occupies an area of less than 0.2 mm2.
M.L. Roukes, M.R. Freeman, et al.
Physical Review Letters
J.D. Crow, Joong-ho Choi, et al.
ECTC 1996
Mark Jeffery, T. Van Duzer, et al.
Applied Physics Letters
M.B. Ketchen, D.J. Pearson, et al.
IEEE TAS