The 5th international workshop on numerical modelling of high temperature superconductors

Morandi, Antonio; Ainslie, Mark; Grilli, Francesco; Stenvall, Antti

doi:10.1088/1361-6668/aa7676

Cited by 1 publication

(1 citation statement)

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“…Including flux pinning in our modeling [47][48][49] via, for example, the critical state model 33 would allow studying alternative trap opportunities, which may offer chip-based traps with even higher trap frequencies. Our modeling is generic and applicable not only in the present context of simulating chip-based superconducting traps for quantum or sensing experiments, but also for designing superconducting magnetic shields 50 or filling factors in superconducting resonators 32 , when considering superconductors in the Meissner state.…”

Section: Discussionmentioning

confidence: 99%

Chip-based superconducting traps for levitation of micrometer-sized particles in the Meissner state

Latorre

Hofer

Rudolph

et al. 2020

Supercond. Sci. Technol.

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We present a detailed analysis of two chip-based superconducting trap architectures capable of levitating micrometer-sized superconducting particles in the Meissner state. These architectures are suitable for performing novel quantum experiments with more massive particles or for force and acceleration sensors of unprecedented sensitivity. We focus in our work on a chip-based anti-Helmholtz coil-type trap (AHC) and a planar double-loop (DL) trap. We demonstrate their fabrication from superconducting Nb films and the fabrication of superconducting particles from Nb or Pb. We apply finite element modeling (FEM) to analyze these two trap architectures in detail with respect to trap stability and frequency. Crucially, in FEM we account for the complete three-dimensional geometry of the traps, finite magnetic field penetration into the levitated superconducting particle, demagnetizing effects, and flux quantization. We can, thus, analyze trap properties beyond assumptions made in analytical models. We find that realistic AHC traps yield trap frequencies well above 10 kHz for levitation of micrometer-sized particles and can be fabricated with a three-layer process, while DL traps enable trap frequencies below 1 kHz and are simpler to fabricate in a single-layer process. Our numerical results guide future experiments aiming at levitating micrometer-sized particles in the Meissner state with chip-based superconducting traps. The modeling we use is also applicable in other scenarios using superconductors in the Meissner state, such as for designing superconducting magnetic shields or for calculating filling factors in superconducting resonators.

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