Magnetic Behavior of Superconductor / Ferromagnetic Metallic and Perovskite Based Superlattices

J. GUIMPEL; C. MONTON; N. HABERKORN; F. DE LA CRUZ

Santa Marta

Congreso; Trends on Novel Materials; 2006

We present a study of the magnetic behaviour of superconducting/ferromagnetic superlattices, both for metallic and perovskite based systems. In the first case we find that the response is dominated by the ferromagnetic layer regime. If these layers are very thin, no ferromagnetism is observed, but the superconducting layers are decoupled, and the superlattice behaves as a stack of independent superconducting films. For thicker ferromagnetic films, ferromagnetism is established and the effective field resulting from the superposition of stray and applied fields dominates the superconducting response of the superlattice. For the perovskite based superlattices, the physical properties are more affected by interface disorder. In this case we have found evidence for a charge carrier transfer between both materials, inducing a change in the magnetic character of the manganite.