Asymmetric superconducting quantum interference devices for suppression of phase diffusion in small Josephson junctions

2013 ◽  
Vol 113 (18) ◽  
pp. 183905 ◽  
Author(s):  
D. F. Sullivan ◽  
S. K. Dutta ◽  
M. Dreyer ◽  
M. A. Gubrud ◽  
A. Roychowdhury ◽  
...  
Keyword(s):  
Josephson Junctions ◽  
Quantum Interference ◽  
Superconducting Quantum Interference Devices ◽  
Phase Diffusion ◽  
Superconducting Quantum Interference

NanoSQUIDs Applied to the Investigation of Small Magnetic Systems

2017 ◽  
Author(s):  
M.J. Martínez-Pérez ◽  
R. Kleiner ◽  
D. Koelle
Keyword(s):  
Magnetic Field ◽  
Josephson Junctions ◽  
Quantum Interference ◽  
Magnetic Systems ◽  
Superconducting Quantum Interference Devices ◽  
Stray Magnetic Field ◽  
Phase Dynamics ◽  
Superconducting Quantum Interference ◽  
Practical Constraints

This article discusses the use of nanoSQUIDs for investigating small magnetic systems. It begins with an overview of the basics of superconducting quantum interference devices, focusing on how a dc SQUID operates and the use of resistively and capacitively shunted junction model to describe the phase dynamics of Josephson junctions (JJs). It then considers the motivation for using nanoSQUIDs, along with the importance of their size and geometry. It also evaluates micro- and nanoSQUIDs made of various types of JJs including nanoSQUIDs based on sandwich-like junctions, constriction-like junctions, and proximized structures. After reviewing different nanoSQUID readout methods that can be used to directly sense the stray magnetic field created by a nanoscale magnetic sample, the article concludes by highlighting some of the practical constraints and challenges encountered in using nanoSQUID technology, including particle positioning with respect to the sensor’s surface.

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