Superconductor Science and Technology · 2011 · 28 citations · 25 references
EngineeringBioengineeringElectrical EngineeringElectromagneticsElectromagnetismSensorsMagnetic Resonance ImagingMagnetic Resonance Imaging PhysicsMagnetic SensorsMagnetic Thin FilmsSuperconducting Magnet SystemsSuperconducting Thin FilmsMagnetic Field SensorsMagnetoencephalographyMagnetometersNuclear Magnetic Resonance StudiesQuantum InterferenceSquid MagnetometersTransient NoiseTransient Noise Analysis
Flux trapping and random flux movement are common problems in superconducting thin-film devices. Ultrasensitive magnetic field sensors based on superconducting quantum interference devices (SQUIDs) coupled to large pickup coils are especially vulnerable to strong external fields. The issue has become particularly relevant with the introduction of SQUID-based ultra-low-field (ULF) nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) techniques. In this paper, we study the constraints of thin-film-based magnetometers and gradiometers as exposed to magnetic field sequences of ULF MRI. In particular, we address issues such as response recovery, transient noise, magnetization and behaviour under shielded room conditions after prepolarization. As a result, we demonstrate sensors that are suitable for a combined multi-channel magnetoencephalography (MEG) and MRI imaging system.
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Surface Barrier in Type-II Superconductors
C. P. Bean, J. D. Livingston · Physical Review Letters · 1964 · 1.1K citations
Geometrical Barriers in High-Temperature Superconductors
E. Zeldov, A. I. Larkin, V. B. Geshkenbeǐn et al. · Physical Review Letters · 1994 · 611 citations