Strain Effect on the Electrical and Magnetic Properties of La0.7Ba0.3MnO3 Thin Films Grown by Metal-Organic Deposition
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La0.7Ba0.3MnO3 thin films have been epitaxially grown by metal-organic deposition on SrTiO3 (STO) and LaAlO3 (LAO) single-crystal substrates. Temperature dependence of magnetization M(T) and resistivity ρ(T) are used to characterize the Curie temperature (T C) of the ferromagnetic transition. T C is found to be extremely sensitive to the biaxial strain and film thickness. The T C increases gradually by increasing the film thickness on both STO and LAO substrates, but does not reach the value of the bulk material. This behavior is interpreted in terms of lattice strain in the films and correlated to the microstructural properties.
KeywordsThin films LBMO Epitaxial growth Manganite Strain Curie temperature
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