La0.9Sr0.1MnO3 (LSMO) films are grown on LaAlO3(100) substrates through metal-organic (MO)CVD using "second generation" precursors of Sr, La, and Mn. An in-situ novel MOCVD strategy is adopted which involves the use of two different molten mixtures consisting of the La(hfa)(3)center dot diglyme and Sr(hfa)(2)center dot tetraglyme adducts as La and Sr sources, respectively, and Mn(hfa)(2)center dot tmeda or Mn(tmhd)(3) as Mn precursor [Hhfa = 1,1,1,5,5,5-hexafluoro-2,4-pentanedione, diglyme = bis(2-methoxyethyl)ether, tetraglyme = 2,5,8,11,14-pentaoxapentadecane, tmeda = N,N,1\1',I\V-tetramethylethylendiamine and H-tmhd = 2,2,6,6-tetramethy1-3,5-heptandione]. The X-ray diffraction (XRD) patterns show that the films are c-axis oriented. Pole figures are applied as a simple non-invasive tool to assess the textural nature of these LSMO films. The morphology is investigated using the scanning electron microscopy (SEM) and atomic force microscopy (AFM) that reveal the presence of grains, 300 nm average dimensions, and a root mean square (rms) surface roughness of 21 nm. Chemical composition through energy-dispersive X-ray (EDX) analysis indicates that the films possess a stoichiometry of about 0.9:0.1:1 ratio, while X-ray photoelectron spectroscopy (XPS) depth profiles are used to assess the vertical compositional homogeneity. The ferromagnetic/paramagnetic and metallic/insulating transition temperatures are determined by standard four-contact resistivity versus temperature measurements.
|Titolo:||In-Situ Growth and Characterization of Highly Textured La0.9Sr0.1MnO3 Films on LaAlO3(100) Substrates|
|Autori interni:||MALANDRINO, Graziella|
|Data di pubblicazione:||2010|
|Rivista:||CHEMICAL VAPOR DEPOSITION|
|Appare nelle tipologie:||1.1 Articolo in rivista|