Nanoscale crystal imperfection-induced characterization changes of manganite nanolayers with various crystallographic textures
Institute of Materials Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan
Nanoscale Research Letters 2013, 8:345 doi:10.1186/1556-276X-8-345Published: 6 August 2013
(La,Sr)MnO3 (LSMO) nanolayers with various crystallographic textures were grown on the sapphire substrate with and without In2O3 epitaxial buffering. The LSMO nanolayer with In2O3 epitaxial buffering has a (110) preferred orientation. However, the nanolayer without buffering shows a highly (100)-oriented texture. Detailed microstructure analyses show that the LSMO nanolayer with In2O3 epitaxial buffering has a high degree of nanoscale disordered regions (such as subgrain boundaries and incoherent heterointerfaces) in the film. These structural inhomogeneities caused a low degree of ferromagnetic ordering in LSMO with In2O3 epitaxial buffering, which leads to a lower saturation magnetization value and Curie temperature, and higher coercivity and resistivity.