Superconducting transition and vortex pinning in Nb films patterned with nano-scale hole-arrays.
Nb films containing extended arrays of holes with 45-nm diameter and 100-nm spacing have been fabricated using anodized aluminum oxide as substrate. Pronounced matching effects in the magnetization and Little-Parks oscillations of the superconducting critical temperature have been observed in fields up to 9 kOe. Flux pinning in the patterned samples is significantly enhanced as compared to unpatterned reference samples in applied fields exceeding 5 kOe. Matching effects are a dominant contribution to vortex pinning at temperatures as low as 4.2 K due to the extremely small spacing of the holes.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF; DOD
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 949594
- Report Number(s):
- ANL/MSD/JA-42296
- Journal Information:
- Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: Dec. 1, 2002 Vol. 66; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- ENGLISH
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