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

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.

arXiv commentTo appear in Phys. Rev. B with 7 pages and 5 figures

References in corpus (9)

• Observation of half-height magnetization steps in Sr2RuO4
• Persistent currents in normal metal rings
• Fundamental studies of superconductors using scanning magnetic imaging
• Integer and half-integer flux-quantum transitions in a niobium/iron-pnictide loop
• Superconducting thin rings with finite penetration depth
• Magnetic-field and current-density distributions in thin-film superconducting rings and disks
• Quantum-based Mechanical Force Realization in Pico-Newton Range
• Sensitivity of ultracold atoms to quantized flux in a superconducting ring
• Large magnetic penetration depth and thermal fluctuations in a Ca${}_{10}$(Pt${}_3$As${}_8$)[(Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$]${}_5$ (x=0.097) single crystal