Study of Low-Frequency Noise Performance of Nanobridge-Based SQUIDs in External Magnetic Fields

Rozhko, Sergiy; Hino, T.; Blois, A.; Líu, Hao; Gallop, John; Cox, D. C.; Romans, E.J.

doi:10.1109/tasc.2012.2233537

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…The heater consists in a normal metal thin film separated from the superconductor by an insulating layer. Finally, it is worth to mention that several experimental studies about the noise properties of nanoSQUIDs based on nanobridges have been carried out [153,[158][159][160]184]. These investigations included measurements of both white and low frequency magnetic noise as a function of the applied magnetic field, the temperature and the nanoSQUID design.…”

Section: Fig 30 A) Sem Images Of Ti/au Bilayer Nanosquid With Cooling...mentioning

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 30 A) Sem Images Of Ti/au Bilayer Nanosquid With Cooling...mentioning

confidence: 99%

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

2016

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“…At temperatures below this hysteretic behaviour begins, which we attribute to hot-spot generation, following the descriptions given in a number of references, see for example [10][11][12]. The condition for non-hysteretic behavior is that the re-trapping current I r , that is the minimum current needed to sustain a normal state hotspot once I c has been exceeded, must be smaller than I c itself.…”

Section: A Current Voltage Characteristics and Their Temperaturementioning

confidence: 96%

Fabrication and Analogue Applications of NanoSQUIDs Using Dayem Bridge Junctions

Líu

Gallop

Cox

et al. 2015

IEEE J. Select. Topics Quantum Electron.

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Abstract-We report here recent work at the UK National Physical Laboratory (NPL) on developing nanoscale SQUIDs using Dayem bridge Josephson junctions. The advantages are simplicity of fabrication, exceptional low-noise performance, towards the quantum limit, and a range of novel applications. Focused ion beam patterned Nb SQUID, possessing exceptionally low noise (~200n 0/ Hz 1/2 above 1kHz), and operating above 4.2 K can be applied to measurement of nanoscale magnetic objects or coupled to nano-electromechanical (NEMS) resonators, as well as single particle detection of photons, protons and ions. The limited operating temperature range may be extended by exposing the Dayem bridges to carefully controlled ion beam implantation, leading to non-reversible changes in junction transition temperature.

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Physics and Applications of NanoSQUIDs

Gallop¹,

Líu²

2019

Fundamentals and Frontiers of the Josephson Effect

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Study of Low-Frequency Noise Performance of Nanobridge-Based SQUIDs in External Magnetic Fields

Cited by 5 publications

References 23 publications

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

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

Fabrication and Analogue Applications of NanoSQUIDs Using Dayem Bridge Junctions

Physics and Applications of NanoSQUIDs

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