Flux pinning enhancement in ferromagnetic and superconducting thin-film multilayers

Jan, D. B.; Coulter, J. Y.; Hawley, M. E.; Bulaevskii, L. N.; Maley, M. P.; Jia, Q. X.; Maranville, B. B.; Hellman, F.; Pan, X. Q.
February 2003
Applied Physics Letters;2/3/2003, Vol. 82 Issue 5, p778
Academic Journal
Flux pinning in high-temperature superconductors such as YBa[sub 2]Cu[sub 3]O[sub 7-x] (YBCO) in the past has been accomplished by pinning the vortex cores. We demonstrate magnetic-domain-induced flux pinning of the magnetic flux of vortices in a ferromagnet-superconductor bilayer consisting of CoPt grown on YBCO, where the ferromagnet has uniaxial perpendicular magnetic anisotropy and a random domain structure. We observe an improvement of the critical current due to magnetic pinning at temperatures close to the transition temperature.


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