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Progress in High-T, dc SQUIDs
並列摘要
This paper reviews the development of magnetometers based on dc Superconducting Quantum Interference Devices (SQUIDS) fabricated from thin films of YBa2Cu3O7-x, (YBCO) and operated in liquid nitrogen at 77 K. The directly coupled magnetometer consists of a single layer of YBCO d e posited on a SrTiO3 (STO) bicrystal patterned so that a pickup loop is connected to the body of the SQUlD. These magnetometers achieve a magnetic field noise of under 100 fT Hz- '/' at frequencies down to below 1 Hz; the sensitivity may be improved by a factor of 3 or more by inductively coupling the device to a single-layer flux transformer on a 50 mm-diameter substrate. The process for depositing YBCO-STO-YBCO multilayers is reviewed. A fractional turn SQUID involving 16 loops and only 7 mm in diameter exhibited a magnetic field noise of 18 fT Hz -1/2 at 1 kHz and 37 fT Hz-1/2 at 1 Hz. A multilayer, multiturn flus transformer magnetically coupled to a SQUID in a flip-chip arrangement achieved a magnetic field noise of 8.5 fT Hz-1/2 at 1 kHz and 27 fT Hz-1/2 at 1 Hz; the area of the pickup loop was 10 x 10 mm^2.
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