Regensburg 2010 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 7: SC: Heterostructures, Andreev Scattering, Proximity Effect, Coexistence

TT 7.7: Vortrag

Montag, 22. März 2010, 15:30–15:45, H20

High-resolution magnetization profiles in superconducting YBCO and ferromagnetic LCMO hybrid structures at low temperatures. — S. Brück¹, •J. Albrecht², S. Soltan^3,4, G. Christiani⁴, H.-U. Habermeier⁴, P. Audehm⁵, S. Macke⁵, and E. Goering⁵ — ¹Universität Würzburg — ²Hochschule Aalen — ³Helwan University, Cairo, Egypt — ⁴MPI für Festkörperforschung, Stuttgart — ⁵MPI für Metallforschung, Stuttgart

At the interface between ferromagnetic (F) and superconducting (SC) thin films a fascinating competition of ordering parameters takes place. We have investigated a hybrid structure of SrTiO₃(substrate), ferromagnetic La_0.7Ca_0.3MnO₃ and superconducting YBa₂Cu₃O₇ using X-ray magnetic resonant reflectometry (XRMR) and x-ray magnetic circular dichroism (XMCD). In particular, the XRMR measurements provide element selective magnetic depth profiles of layered samples with an enhanced sensitivity for localized and or interface effects. A temperature-dependent investigation of the resonant reflectometry at the Mn L edge in the temperature range from T=40K to T=110K was carried out and the magnetic depth profile for Mn was extracted. It can be shown that both the interaction to the adjacent YBCO layer and to the STO substrate influence the magnetization inside the LCMO layer in a particular way which will be presented in detail. The experimental findings give new insight into the physics of multilayered oxidic structures at low temperatures.