The possibilities for preparation of bilayers containing magnetic Fe-oxide (Fe-O) and high temperature superconducting (HTS) YBa2Cu3O7−x (YBCO) thin films were investigated. For this purpose, Fe-O films were deposited using reactive magnetron sputtering at comparatively low temperatures T≤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 T C 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.

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imaginary component feoybcolao bilayer width reactive magnetron sputtering barrier water vapour superconducting hts ybainf locpost2infcuinf hts ybco dielectric for example laaloinf locpost3inf lao vortex state chains the ac harmonic magnetic field double peak structure response signal superconducting transition sample magnetic feoxide feo critical temperature italictitalic inf locpostcinf of the ybco film

T. Nurgaliev, I. Starbova, G. Gajda, L. Slavov, M. Nankovski, N. Starbov, B. Blagoev, I. Nedkov, D. Kovacheva, K. Buchkov, E. Mateev,.Magnetron sputtering of Fe-oxides on the top of HTS YBCO films. 429 (0),138-141.

T. Nurgaliev, et al."Magnetron sputtering of Fe-oxides on the top of HTS YBCO films" 429

T. Nurgaliev, I. Starbova, G. Gajda, L. Slavov, M. Nankovski, N. Starbov, B. Blagoev, I. Nedkov, D. Kovacheva, K. Buchkov, E. Mateev,"Magnetron sputtering of Fe-oxides on the top of HTS YBCO films"