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arXiv · 1701.07598

Precision determination of a fluxoid quantum's magnetic moment in a superconducting micro-ring

Heonhwa Choi·Yun Won Kim·Soon-Gul Lee·Mahn-Soo Choi·Min-Seok Kim·Jae-Hyuk Choi
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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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Heonhwa Choi, Yun Won Kim, Soon-Gul Lee, Mahn-Soo Choi, Min-Seok Kim, Jae-Hyuk Choi. 2017-01-26. Precision determination of a fluxoid quantum's magnetic moment in a superconducting micro-ring. https://doi.org/10.1103/physrevb.95.064505

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