Abstract
The effects of residual and tunable strain in thin films of La0.7Ba0.3MnO3 (LBMO) were investigated. Different residual strains were achieved by depositing LBMO films with various thicknesses on 0.7PbMg1/3Nb2/3O3–0.3PbTiO3 (PMN-PT) and SrTiO3 (STO). For LBMO on PMN-PT, when the thickness changes the resistance evolves dramatically. All samples on STO have a clear metal-to-insulator transition near room temperature. The tunable strain was modulated through the converse piezoelectric effects of PMN-PT. Clear voltage-controlled resistance modulations (|ΔR|/Rmax ∼ 90%) were observed in LBMO/PMN-PT. The magnitude and nonlinearity of elastoresistance are the largest in the thinnest sample. |ΔR|/R decreases as the thickness increases and is still substantial even the film is as thick as 150 nm. For thicker samples, the nonlinearity becomes weaker and the resistance changes linearly with voltage approximately.
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