MgB2 SQUID for Magnetocardiography

Harada, Y.; Kobayashi, Kei; Yoshizawa, Michito

doi:10.5772/38652

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…Moreover, as seen, the fabrication of SQUID based on nanobridges benefits by long coherence length. Therefore, since its discovery, several SQUID sensors based on MgB 2 have been developed [224,225]. Micro-sized MgB 2 SQUIDs based on nanobridges (100 nm in width) with a loop area of about 10 µm 2 have been fabricated by using a FIB technique [226,227] (Fig.44d).…”

Section: Fig 44 Sem Images Of Microsquids Based On: A) Josephson Nanmentioning

confidence: 99%

Nano Superconducting Quantum Interference device: A powerful tool for nanoscale investigations

2016

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The magnetic sensing at nanoscale level is a promising and interesting research topic of nanoscience. Indeed, magnetic imaging is a powerful tool for probing biological, chemical and physical systems. The study of small spin cluster, like magnetic molecules and nanoparticles, single electron, cold atom clouds, is one of the most stimulating challenges of applied and basic research of the next years. In particular, the magnetic nanoparticle investigation plays a fundamental role for the modern material science and its relative technological applications like ferrofluids, magnetic refrigeration and biomedical applications, including drug delivery, hyper-thermia cancer treatment and magnetic resonance imaging contrast-agent. Actually, one of the most ambitious goals of the high sensitivity magnetometry is the detection of elementary magnetic moment or spin. In this framework, several efforts have been devoted to the development of a high sensitivity magnetic nanosensor pushing sensing capability to the individual spin level. Among the different magnetic sensors, Superconducting QUantum Interference Devices (SQUIDs) exhibit an ultra high sensitivity and are widely employed in numerous applications. Basically, a SQUID consists of a superconducting ring (sensitive area) interrupted by two Josephson junctions. In the recent years, it has been proved that the magnetic response of nano-objects can be effectively measured by using a SQUID with a very small sensitive area (nanoSQUID). In fact, the sensor noise, expressed in terms of the elementary magnetic moment (spin or Bohr magneton), is linearly dependent on the SQUID loop side length. For this reason, SQUIDs have been progressively miniaturized in order to improve the sensitivity up to few spin per unit of bandwidth. With respect to other techniques, nanoSQUIDs offer the advantage of direct measurement of magnetization changes in small spin systems. In this

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Section: Fig 44 Sem Images Of Microsquids Based On: A) Josephson Nanmentioning

confidence: 99%

Nano Superconducting Quantum Interference device: A powerful tool for nanoscale investigations

2016

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“…For more than a decade, MgB 2 SQUIDs have been successfully fabricated and studied by several groups [2][3][4][5][6][7]. Nowadays, MgB 2 -based SQUIDs are developed instruments for practical applications [8] and have been integrated into experimental systems, such as for magnetocardiography [9].…”

Section: Introductionmentioning

confidence: 99%

Micro-SQUIDs based on MgB₂nano-bridges for NEMS readout

Lolli

Portesi

et al. 2016

Supercond. Sci. Technol.

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We show the results obtained from the fabrication and characterisation of MgB2 loops with two nano-bridges as superconducting weak links. These ring structures are made to operate as superconducting quantum interference devices and are investigated as readout system for cryogenics NEMS resonators. The nano-constrictions are fabricated by EBL and ion beam milling. The SQUIDs are characterised at different temperatures and measurements of the noise levels have been performed. The devices show high critical current densities and voltage modulations under applied magnetic field, close to the critical temperatures.

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