Enhanced flux pinning in a high- superconducting film by a ferromagnetic buffer layerX. X. Zhang, G. H. Wen, R. K. Zheng, G. C. Xiong and G. J. LianEurophys. Lett., 56 1 (2001) 119-125DOI: https://doi.org/10.1209/epl/i2001-00496-6