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Magneto-optical measurements of mesoscopic Nb superconducting structures using a ferromagnetic metal indicator layer

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Title
Magneto-optical measurements of mesoscopic Nb superconducting structures using a ferromagnetic metal indicator layer
Author(s)
Hyeokjun Heo; Won Beom Choi; Sangwook Ha; Hangyeol Park; Joonho Jang
Publication Date
2022-06
Journal
Journal of Applied Physics, v.131, no.23
Publisher
American Institute of Physics Inc.
Abstract
© 2022 Author(s).Imaging local magnetic fields produced by nano- and micrometer-scale superconductors has become a vital tool that can not only reveal crucial information on the vortex dynamics and order parameters of the superconducting materials but also visualize the working mechanism of superconducting devices made for quantum information. Here, we performed measurements of the magnetic field distributions of mesoscopic superconducting structures with various geometries by combining a thin ferromagnetic metal layer as a magneto-optical sensing element that responds to the environmental magnetic fields and a custom-made sensitive Sagnac interferometer. The sensitivity of the technique enables the observation of magnetic flux jumps due to individual vortex entries into nanostructured superconductors. In addition, with the control of incident power at a focused laser spot, we induce thermally driven movement of vortices that leaves a trace of a microscopic optical heating pattern.
URI
https://pr.ibs.re.kr/handle/8788114/12029
DOI
10.1063/5.0095943
ISSN
0021-8979
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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