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Shibata Y, Nomura S, Kashiwaya H, Kashiwaya S, Ishiguro R, Takayanagi H. Imaging of current density distributions with a Nb weak-link scanning nano-SQUID microscope. Sci Rep 2015; 5:15097. [PMID: 26459874 PMCID: PMC4602221 DOI: 10.1038/srep15097] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 09/15/2015] [Indexed: 11/10/2022] Open
Abstract
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.
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Affiliation(s)
- Yusuke Shibata
- Division of Physics, University of Tsukuba, Tennodai, Tsukuba, 305-8571, Japan
| | - Shintaro Nomura
- Division of Physics, University of Tsukuba, Tennodai, Tsukuba, 305-8571, Japan
| | - Hiromi Kashiwaya
- National Institute of Advanced Industrial Science and Technology (AIST), Umezono, Tsukuba, 305-8568, Japan
| | - Satoshi Kashiwaya
- National Institute of Advanced Industrial Science and Technology (AIST), Umezono, Tsukuba, 305-8568, Japan
| | - Ryosuke Ishiguro
- Department of Mathematical and Physical Sciences, Faculty of Science, Japan Women's University, Mejirodai, Bunkyo-ku, Tokyo 112-8681, Japan.,Department of Applied Physics, Faculty of Science, Tokyo University of Science, Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Hideaki Takayanagi
- Department of Applied Physics, Faculty of Science, Tokyo University of Science, Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
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