Parts | Days | Selection | Search | Updates | Downloads | Help
SKM-SYDT: SKM-Symposium Diffusionless Transformations in Magnetic and Ferroelectric Bulk and Thin Films
SKM-SYDT 1: Diffusionless Transformations in Magnetic and Ferroelectric Bulk and Thin Films
SKM-SYDT 1.5: Invited Talk
Thursday, March 17, 2011, 12:30–13:00, TRE Ma
Orthorhombic to tetragonal transition of SrRuO3 layers in Pr0.7Ca0.3MnO3/SrRuO3 superlattices — •Michael Ziese1, Francis Bern1, Ionela Vrejoiu2, Eckhard Pippel2, and Elizaveta Nikulina2 — 1Div. of Superconductivity and Magnetism, University of Leipzig, D-04103 Leipzig, Germany — 2Max Planck Institute of Microstructure Physics, D-06120 Halle, Germany
In perovskite superlattices (SLs) the intimate interplay between structural, magnetic and electronic properties can be modified by geometrical constraints. This is explored in this work by the study of the crystallographic, magnetic and magnetotransport properties of ultrathin SrRuO3 (SRO) layers embedded in SLs. Pr0.7Ca0.3MnO3/SrRuO3 (PCMO/SRO) SLs were grown by pulsed laser deposition on vicinal SrTiO3 substrates with a miscut angle of about 0.1∘, uniform TiO2-termination and an atomically flat terrace morphology. The SRO layer thickness was kept constant at 4 nm, whereas the PCMO layer thickness was varied between 1.5 and 4 nm. High resolution TEM investigations of the PCMO/SRO SLs showed that the PCMO layers were orthorhombic throughout, whereas the SRO layers were orthorhombic when adjacent to 1.5 nm thick PCMO layers and transformed to tetragonal when adjacent to 4 nm thick PCMO layers. This structural transformation profoundly changed the form of the angular dependent magnetoresistance (MR) as well as the direction of the magnetic easy axes. Further the antiferromagnetic interlayer exchange coupling between PCMO and SRO layers was stronger in the orthorhombic than in the tetragonal phase.