Coupled magnetic and structural transitions in La0.7Sr0.3MnO3 films on SrTiO3

New J. Phys. 10, 063024 (2008)

M Ziese, I Vrejoiu, A Setzer, A Lotnyk and D Hesse


The magnetic properties of three epitaxial La0.7Sr0.3MnO3 films of thickness 5, 15 and 40 nm grown on SrTiO3 (001) substrates were investigated. The structural transition of the SrTiO3 substrate induces a magnetic transition in the manganite films due to magnetoelastic coupling. Below the temperature of the structural transition additional steps in the magnetization reversal characteristics appear characterized by clearly defined coercive fields. These additional coercive fields depend on the cooling history of the sample and are related to the formation of structural domains in the La0.7Sr0.3MnO3 films induced by the substrate.