The La 0.7 Sr 0.3 CoO 3-/ La 0.7 Sr 0.3 MnO 3-(LSCO/LSMO) bilayer system is an ideal perovskite oxide platform for investigating electronic interface reconstruction and its effect on the magnetic properties. Previous studies have shown LSCO can separate into magnetic sublayers which possess distinct trends as the total LSCO thickness increases. In this study we used polarized neutron reflectometry to quantify changes to the magnetic and chemical depth profiles and it confirms the formation of ~12 Å thick interfacial LSCO and LSMO layers, characterized by a decreased nuclear scattering length density compared to the bulk of the layers. This decrease is attributed to the combined effects of oxygen vacancy formation and interfacial charge transfer which lead to magnetically active Co 2+ ions with ionic radii larger than the Co 3+ /Co 4+ ions typically found in bulk LSCO or single layer films. The interfacial magnetization values, as well as Co 2+ ion and oxygen vacancy concentrations, depend strongly on the LSCO layer thickness.These results highlight the sensitive interplay of the cation valence states, oxygen vacancy concentration, and magnetization at interfaces in perovskite oxide multilayers, demonstrating the potential to tune their functional properties via careful design of their structure.
Hierarchical, flexible, and platinum-free TiO1.1Se0.9/carbon cloth counter electrode efficiently rendered its dye-sensitized solar cell 9.47% and 10.32% efficiencies in iodide-based and cobalt-based electrolytes, respectively.
A TCO-free counter electrode of a sulfonated-polythiophene/carbon cloth gave a good cell efficiency (η) of 8.45% to its dye-sensitized solar cell, indicating its attractive potential to replace the expensive Pt/FTO (η = 8.07%).
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