Applied Physics Letters · 1991 · 77 citations · 4 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsSensorsMagnetic CharacterizationMagnetic SensorsMagnetic Thin FilmsSuperconducting MaterialsSuperconducting Thin FilmsThin Film Magnetic PropertiesField SensitivityJosephson JunctionsLow-frequency NoiseMagnetic NoisePhotolithographic PatterningQuantum InterferenceSuperconducting Quantum Interference Device MagnetometryThin-film Magnetic Sensors
Our YBa2Cu3O7−x thin-film magnetometer consists of a dc superconducting quantum interference device with bi-epitaxial Josephson junctions, fabricated on one chip, and a flux transformer with a multiturn input coil, fabricated on a second chip. Photolithographic processing is used to pattern all layers. The magnetometer operates in a flux-locked loop at temperatures up to 81 K, with the flux transformer improving the magnetic field sensitivity by a factor of 83±3. The low-frequency rms magnetic field noise scales approximately as 1/f1/2, where f is the frequency, with a magnitude of 0.6 pT Hz−1/2 at 10 Hz and 0.09 pT Hz−1/2 at 1 kHz with the magnetometer immersed in liquid N2.
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Low noise YBa2Cu3O7−δ grain boundary junction dc SQUIDs
P. Chaudhari, M. Kawasaki, M. B. Ketchen et al. · Applied Physics Letters · 1990 · 247 citations
Low-noise thin-film TlBaCaCuO dc SQUIDs operated at 77 K
R. H. Koch, W. J. Gallagher, Bruce Bumble et al. · Applied Physics Letters · 1989 · 124 citations
Noise and dc characteristics of thin-film Bi-Sr-Ca-Cu-oxide dc SQUIDs
D.W. Face, J. M. Graybeal, T. P. Orlando et al. · Applied Physics Letters · 1990 · 25 citations