Imaging of current density distributions with a Nb weak-link scanning nano-SQUID microscope

Superconducting quantum interference devices (SQUIDs) are accepted as one of the highest magnetic field sensitive probes. There are increasing demands to image local magnetic fields to explore spin properties and current density distributions in a two-dimensional layer of semiconductors or supercond...

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Bibliographic Details
Published in:Scientific reports 2015-10, Vol.5 (1), p.15097-15097, Article 15097
Main Authors: Shibata, Yusuke, Nomura, Shintaro, Kashiwaya, Hiromi, Kashiwaya, Satoshi, Ishiguro, Ryosuke, Takayanagi, Hideaki
Format: Article
Language:English
Subjects:
639/766
639/766/119
Humanities and Social Sciences
Hysteresis
Magnetic fields
multidisciplinary
Probes
Scanning
Science
Spatial discrimination
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Summary:Superconducting quantum interference devices (SQUIDs) are accepted as one of the highest magnetic field sensitive probes. There are increasing demands to image local magnetic fields to explore spin properties and current density distributions in a two-dimensional layer of semiconductors or superconductors. Nano-SQUIDs have recently attracting much interest for high spatial resolution measurements in nanometer-scale samples. Whereas weak-link Dayem Josephson junction nano-SQUIDs are suitable to miniaturization, hysteresis in current-voltage ( I-V ) characteristics that is often observed in Dayem Josephson junction is not desirable for a scanning microscope. Here we report on our development of a weak-link nano-SQUIDs scanning microscope with small hysteresis in I - V curve and on reconstructions of two-dimensional current density vector in two-dimensional electron gas from measured magnetic field.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep15097