TY - JOUR
T1 - Direct observation of magnetic flux and interstitial vortices in perforated mesoscopic squares of superconducting films
AU - Mitsuishi, M.
AU - Kokubo, N.
AU - Kitano, K.
AU - Okayasu, S.
AU - Nojima, T.
AU - Sasaki, T.
N1 - Funding Information:
N. K acknowledges K. Makise for providing us Nb films. This work was supported by JSPS KAKENHI (Grant Numbers 26287075 and 17K05537), the Inter-university Cooperative Research Program of the Institute for Materials Research, Tohoku University (Proposal No. 16K0004 and 17K0051), and NIMS Nanofabrication Platform in Nanotechnology Platform Project sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2018/4/19
Y1 - 2018/4/19
N2 - 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.
AB - 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.
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U2 - 10.1088/1742-6596/969/1/012074
DO - 10.1088/1742-6596/969/1/012074
M3 - Conference article
AN - SCOPUS:85046080936
SN - 1742-6588
VL - 969
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012074
T2 - 28th International Conference on Low Temperature Physics, LT 2018
Y2 - 9 August 2017 through 16 August 2017
ER -