Abstract
Epitaxially strained LaCoO3 (LCO) films exhibit ferromagnetic ordering below a Curie temperature T C of 85 K in contrast to polycrystalline unstrained films which are paramagnetic at this temperature [1]. To correlate the observed magnetic properties with the microstructure, LCO films with different thicknesses of 10, 20, 50 and 100 nm were epitaxially grown by pulsed laser deposition. [001]-oriented (LaAlO3)0.3(Sr2AlTaO6)0.7 (LSAT) was used as substrate. Both, the substrates and the LCO, exhibit a perovskitetype structure. LCO is rhombohedrally distorted (a LCO = 3.80 A, αLCO = 60.23 °, as bulk material) while LSAT is cubic (a LSAT = 3.86 A). The lattice mismatch of ∼ 1.5 % induces tensile strain in the LCO film. The microstructure of the samples was studied by transmission electron microscopy (TEM) combined with selected-area electron diffraction (SAED) and high-resolution TEM of plan-view and cross-section samples.
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