SQUID Concepts and Systems

Clarke, John

doi:10.1007/978-3-642-83885-9_5

Cited by 39 publications

(27 citation statements)

References 88 publications

(42 reference statements)

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“…for optimized SQUIDs with the McCumber parameter b C ¼2pI C R 2 C JJ /U 0 and b L about unity. 23 Accordingly, for the presented device, the estimated white flux noise level amounts to about 42 nU 0 /Hz 1/2 at 4.2 K, which is in excellent agreement with our measurements. These results are, moreover, consistent with predictions based on the switching current distribution of the SQUID from the zero voltage state as reported in Ref.…”

supporting

confidence: 89%

3D nanoSQUID based on tunnel nano-junctions with an energy sensitivity of 1.3 h at 4.2 K

Schmelz

Vettoliere

Zakosarenko³

et al. 2017

Applied Physics Letters

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We report the performance of a reliable three-dimensional nanometer-sized Superconducting QUantum Interference Device (SQUID). The use of superconductor-isolator-superconductor Nb/ Al-AlO x /Nb Josephson tunnel junctions together with small SQUID loop dimensions permits a high modulation depth of the SQUID's critical current and thus leads to very low intrinsic flux noise of the device. In particular, we present electrical characterization including detailed noise investigations. At 4.2 K, two-stage noise measurements with a SQUID as a low noise preamplifier result in a white flux noise of 51 nU 0 /Hz 1/2 , which is equivalent to an energy resolution of 1.3 h, with h being Planck's constant. Simulation of spin sensitivities results in about 1 l B /Hz 1/2 for an electron spin positioned directly above the SQUID ring. Published by AIP Publishing.

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supporting

confidence: 89%

3D nanoSQUID based on tunnel nano-junctions with an energy sensitivity of 1.3 h at 4.2 K

Schmelz

Vettoliere

Zakosarenko³

et al. 2017

Applied Physics Letters

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“…However, the most important application has been in the area of biomagnetism, the detection of the weak magnetic fields produced by the human brain, heart, and other organs [116,117]. The operation principles of SQUID are based on two effects observable only in the presence of superconductivity: the magnetic flux quantization and the Josephson effect [118][119][120]. There are two main types of SQUID.…”

Section: Superconducting Quantum Interference Devices (Squid)mentioning

confidence: 99%

Detection of magnetic nanomaterials in molecular imaging and diagnosis applications

Yao

2014

Nanotechnology Reviews

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Advances in bionanotechnology promise to allow medical diagnosis and therapy through the channel of molecular imaging. Combining biological science and modern detection techniques, molecular imaging has the ability to penetrate biomedical processes at the molecular and cellular level. Magnetic nanoparticles (MNP), broadly defined as particles of tens of nm to approximately 2 μm in diameter in this review, are playing an increasingly important role in molecular imaging. They act as contrast agents to remarkably enhance the signal. The precise determination of the position and quantity of MNP is critical for these applications. This review describes the advances in the development of detection techniques for magnetic particles used in molecular imaging and diagnosis. The techniques are categorized as high magnetic field techniques and low magnetic field techniques. The high-field studies focus on magnetic resonance imaging (MRI). The ultralow-field (ULF) studies include several of the most recent techniques: giant magnetoresistance sensors, superconducting quantum interference devices, atomic magnetometers, and magnetic particle imaging. The advantages and disadvantages of each method are discussed.

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“…The analysis of the literature revealed that SQUIDs are widely used for biology studies (due to the very weak intensity of the magnetic fields registered) as well as detectors in magnetic field imaging (MFI) or in relaxometry (vide infra), however a complete and detailed discussion on this very specific technique is out from the scope of this review, which instead is focused on the technique easily findable in a magnetism-dedicated laboratory. For more detailed discussion, please consider the following literature and references therein [87][88][89][90].…”

Section: Magnetism and Magnetization (Hysteresis) Curvesmentioning

confidence: 99%

Magnetic Materials and Systems: Domain Structure Visualization and Other Characterization Techniques for the Application in the Materials Science and Biomedicine

2020

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Magnetic structures have attracted a great interest due to their multiple applications, from physics to biomedicine. Several techniques are currently employed to investigate magnetic characteristics and other physicochemical properties of magnetic structures. The major objective of this review is to summarize the current knowledge on the usage, advances, advantages, and disadvantages of a large number of techniques that are currently available to characterize magnetic systems. The present review, aiming at helping in the choice of the most suitable method as appropriate, is divided into three sections dedicated to characterization techniques. Firstly, the magnetism and magnetization (hysteresis) techniques are introduced. Secondly, the visualization methods of the domain structures by means of different probes are illustrated. Lastly, the characterization of magnetic nanosystems in view of possible biomedical applications is discussed, including the exploitation of magnetism in imaging for cell tracking/visualization of pathological alterations in living systems (mainly by magnetic resonance imaging, MRI).

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SQUID Concepts and Systems

Cited by 39 publications

References 88 publications

3D nanoSQUID based on tunnel nano-junctions with an energy sensitivity of 1.3 h at 4.2 K

3D nanoSQUID based on tunnel nano-junctions with an energy sensitivity of 1.3 h at 4.2 K

Detection of magnetic nanomaterials in molecular imaging and diagnosis applications

Magnetic Materials and Systems: Domain Structure Visualization and Other Characterization Techniques for the Application in the Materials Science and Biomedicine

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