Active solid-state devices (e.g. – transistors – solid-state diode – Thin active physical layer which is – Tunneling through region of reduced conductivity
Patent
1994-12-29
1996-08-20
Saadat, Mahshid
Active solid-state devices (e.g., transistors, solid-state diode
Thin active physical layer which is
Tunneling through region of reduced conductivity
257 36, 505846, 505874, 505162, 324248, G01R 33035, H01L 2906
Patent
active
055481302
ABSTRACT:
A DC SQUID has a first washer coil for forming a superconducting ring, Josephson junctions and a dampening resistor coupled to both ends of the first washer coil, and a shunting resistor connected in parallel to the Josephson junctions. An input coil is magnetically coupled with the first washer coil, and a first modulation coil is also magnetically coupled with the first washer coil. A ground plane comprising a superconducting film is disposed to cover an area of the Josephson junctions without covering the first washer coil for shielding the Josephson junctions from a magnetic noise. The ground plane prevents a magnetic flux trap from occurring, thus enabling stable operation of the DC SQUID. A washer cover comprising a superconducting film is disposed to cover only a slit portion of the first washer coil to prevent leakage of a magnetic field from the slit portion. The ground plane and the washer cover are simultaneously formed in a same layer of the DC SQUID. A second washer coil can be connected in series, or in parallel, with the first washer coil for forming the superconducting ring. The second washer coil is effective for canceling a uniform magnetic flux, thereby improving the operation of the DC SQUID.
REFERENCES:
patent: 4761611 (1988-08-01), Hoenig
patent: 4801882 (1989-01-01), Daalmans
patent: 5218297 (1993-06-01), Nakane et al.
Fujitsu Scientific and Technical Journal, vol. 24, No. 1, Mar. 1988, Kawasaki, Japan, pp. 47-52, S. Ohara et al., "Reproducible Nb/Al0.sub.x /Nb Josephson Junctions".
Chiba Norio
Shimizu Nobuhiro
Yabe Satoru
Saadat Mahshid
Seiko Instruments Inc.
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