We report magnetic visualizations of fluxoid states in perforated mesoscopic squares of superconducting films with a scanning superconducting quantum interference device microscope. The observed magnetic images clearly reveal how the magnetic flux is distributed and trapped in a hole at different magnetic fields. The magnetization determined from the magnetic images exhibits a tilted sawtooth behavior with the magnetic field, indicating the multiple flux quanta trapped in the hole. Further increase of the magnetic field creates an interstitial vortex (vortices) between the hole and the sample edge. The penetration field Hp of the interstitial vortex depends on the sample size and follows a simple relation μ 0 H p ≈ Φ0 /w 2 with the spacing w between the hole and the sample edge.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2018 Apr 19|
|Event||28th International Conference on Low Temperature Physics, LT 2018 - Gothenburg, Sweden|
Duration: 2017 Aug 9 → 2017 Aug 16
ASJC Scopus subject areas
- Physics and Astronomy(all)