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DS: Fachverband Dünne Schichten

DS 39: Magnetism in Thin Films: Interaction Phenomena and Heterostructures

DS 39.1: Hauptvortrag

Freitag, 29. Februar 2008, 10:15–10:45, H 2032

Vortex Manipulation in Superconductor/Ferromagnet Hybrid Nanosystems(*) — •Victor Moshchalkov — INPAC-K.U.Leuven, Belgium

Artificial hybrid superconductor-ferromagnet (S/F) systems have been used to reveal the interplay between competing superconducting and magnetic order parameters, and to verify the existence of new physical phenomena, including the domain-wall superconductivity (DWS) and the reversed domain superconductivity (RDS)(Nature Materials 3, 793 (2004), Phys. Rev. Lett. 95, 227003 (2005), Phys. Rev. Lett. 95, 237003 (2005), Appl. Phys. Lett. 90, 182501 (2007)). Low-temperature scanning laser microscopy (LTSLM) together with transport measurements were carried out on Nb/PbFe₁₂O₁₉ hybrids in order to reveal local variations of superconductivity induced by the magnetic field template produced by the ferromagnetic substrate. Comparative analysis of the LTSLM and the MFM images has convincingly demonstrated the presence of the RDS (Phys. Rev. Lett. 96, 247003 (2006)). Periodic arrays of magnetic dots were used to investigate tunable field-induced superconductivity caused by the local field compensation with the stray fields of the magnetic dots with a variable magnetization. Critical currents and nucleation of superconductivity were controlled by using different cycles to magnetize the dots (Phys. Rev. B, 74, 220509 (2006)).

(*) In collaboration with W. Gillijns, J. Fritzsche, N. Schildermans, Q.H. Chen, K. De Keyser, A. Silhanek, J. Van de Vondel, A. Aladyshkin, K. Vervaeke, C.C. de Souza Silva, C. Carballeira, Z.R. Yang, V. Metlushko, D. Koelle, H.Eitel,R.Kleiner, R.Szymczak