Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5491104 | Journal of Magnetism and Magnetic Materials | 2017 | 16 Pages |
Abstract
The possibilities for preparation of bilayers containing magnetic Fe-oxide (Fe-O) and high temperature superconducting (HTS) YBa2Cu3O7âx (YBCO) thin films were investigated. For this purpose, Fe-O films were deposited using reactive magnetron sputtering at comparatively low temperatures Tâ¤250 °C onto dielectric (for example, LaAlO3 (LAO)) substrates, covered with a HTS YBCO film. The sputtering of the Fe-O layer at such conditions did not lead to a crucial damage of the critical temperature TC of the YBCO film, but could affect the width of the superconducting transition. A decrease of the critical temperature of the (Fe-O)/YBCO/LAO bilayer kept at ambient conditions was observed, possibly due to the negative effects of the water vapour on the sample characteristics. The double peak structure of the imaginary component of the response signal to the AC harmonic magnetic field, observed in such a (Fe-O)/YBCO/LAO sample, was ascribed from two possible views: as a consequence of morphology determined inter- and intra-granular contributions and/or as transitions from dominant irreversible processes as Bean-Livingston barrier to vortex state chains formation.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
T. Nurgaliev, B. Blagoev, K. Buchkov, E. Mateev, G. Gajda, I. Nedkov, D. Kovacheva, L. Slavov, I. Starbova, N. Starbov, M. Nankovski,