Precise determination of magnetic moment of a fluxoid quantum in a superconducting microring
- Authors
- Choi, Heonhwa; Kim, Yun Won; Lee, Soon-Gul; Choi, Mahn-Soo; Kim, Min-Seok; Choi, Jae-Hyuk
- Issue Date
- 8-2월-2017
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.95, no.6
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 95
- Number
- 6
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/84457
- DOI
- 10.1103/PhysRevB.95.064505
- ISSN
- 2469-9950
- Abstract
- Using dynamic cantilever magnetometry and experimentally determining the cantilever's vibrational mode shape, we precisely measured the magnetic moment of a lithographically defined micron-sized superconducting Nb ring, a key element for the previously proposed subpiconewton force standard. The magnetic moments due to individual magnetic fluxoids and a diamagnetic response were independently determined at T = 4.3 K, with a subfemtoampere-square-meter resolution. The results show good agreement with the theoretical estimation yielded by the Brandt and Clem model within the spring constant determination accuracy.
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