G. Grinstein, G.A. Held, et al.
Journal of Magnetism and Magnetic Materials
We have efficiently coupled single-level YBaCuO (YBCO) input coils to superconducting quantum interference devices (SQUIDs) using coils and SQUIDs made on separate substrates and sandwiched together. At 4.2 K, the coupling efficiency α to a low noise Nb-based SQUID was ∼0.76, with no increase in flux noise. At 77 K, the coupling efficiency of a YBCO coil to a TlBaCaCuO SQUID was ∼0.81. The magnetic field sensitivity of the coupled high T c SQUID at 77 K was 9 pT/√Hz at 1000 Hz, a five times improvement compared to the bare SQUID.
G. Grinstein, G.A. Held, et al.
Journal of Magnetism and Magnetic Materials
V. Foglietti, C.D. Del Gratta, et al.
IEEE Transactions on Magnetics
R.B. Laibowitz, R.H. Koch, et al.
High Temperature Superconducting Compounds 1990
T.R. McGuire, T.R. Dinger, et al.
Physical Review B