Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 222, Issue 1-2, Pages 175-181Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0304-8853(00)00550-3
Keywords
manganites; epitaxial strain; magnetization; surfaces
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La0.7Ca0.3MnO3 films have been grown epitaxially on NdGaO3 (110) substrates using pulsed laser deposition. Because of the very low nominal lattice mismatch with the substrate (less than or equal to0.12%) the films are under low epitaxial stress. The microstructure has been investigated by transmission electron microscopy, atomic force microscopy and X-ray diffraction. Coherently grown films with no detectable lattice defects (by our means) have been obtained. Their magnetic and resistive properties have been studied as a function of him thickness from 2 to 165 nm. The ferromagnetic transition temperature stays near the bulk value down to about 6 nm film thickness, and the spontaneous magnetization has a large value (similar to 85 emu/g) for all thicknesses (excluding the 2 nm film). Magnetic hysteresis loops show in-plane anisotropy that might still have a stress-induced contribution, with a [1 (1) over bar 0] easy and a [0 0 1] hard axis. The appearance of a semiconducting layer at the film surface or the interface with the substrate is discussed. (C) 2000 Elsevier Science B.V. All rights reserved.
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