Moderately shielded high-T<sub>c</sub>SQUID system for rat MCG

Bechstein, S.; Kim, I. S.; Drung, D.; Novikov, I.L.; Schurig, T.

doi:10.1088/1742-6596/234/4/042003

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…Despite the discovery of high temperature superconductors by Bednorz and Müller in 1986 [72] and subsequent developments of high-T c SQUIDs that are capable of operation at liquid nitrogen temperature, all commercial MCG and MEG devices are still presently based on low-T c SQUIDs that require liquid helium for operation at 4.2 K. Nevertheless, sensors that function at liquid nitrogen temperature (77 K) have significant economic and technical advantages. Both earlier and more recent publications have reported successful recordings of MCG and MEG that utilize single-channel or multi-channel systems [73][74][75][76][77][78] based on direct-coupled high-T c SQUID magnetometers with bicrystal JJs. MCG systems that are based on direct-coupled high-T c SQUIDs demonstrate sufficiently high SNR in MSRs because typical MCG signals are relatively large.…”

Section: Discussionmentioning

confidence: 99%

High-T_cSQUID biomagnetometers

Faley

Dammers

Maslennikov

et al. 2017

Supercond. Sci. Technol.

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In this paper, we review the preparation technology, integration in measurement systems and tests of high-Tc superconducting quantum interference devices (SQUIDs) intended for biomagnetic applications. A focus is on developments specific to Forschungszentrum Jülich GmbH, Chalmers University of Technology, MedTech West, and the University of Gothenburg, while placing these results in the perspective of those achieved elsewhere. Sensor fabrication, including the deposition and structuring of epitaxial oxide heterostructures, materials for substrates, epitaxial bilayer buffers, bicrystal and step-edge Josephson junctions, and multilayer flux transformers are detailed. The properties of the epitaxial multilayer high-Tc direct current SQUID sensors, including their integration in measurement systems with special electronics and liquid nitrogen cryostats, are presented in the context of biomagnetic recording. Applications that include magnetic nanoparticle based molecular diagnostics, magnetocardiography, and magnetoencephalography are presented as showcases of high-Tc biomagnetic systems. We conclude by outlining future challenges.

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