Structural and magnetic properties of ultrathin epitaxial La[sub 0.7]Ca[sub 0.3]MnO[sub 3] manganite films: Strain versus finite size effects

de Andrés, A.; Rubio, J.; Castro, G.; Taboada, S.; Martınez, J. L.; Colino, J. M.
July 2003
Applied Physics Letters;7/28/2003, Vol. 83 Issue 4, p713
Academic Journal
We present a structural and magnetic study of La[sub0.7]Ca[sub0.3]MnO7sub3; epitaxial films (the thickness ranges from 2.4 to 80 nm) on SrTiO&sub3;. Their structure, as obtained by x-ray diffraction, is orthorhombic)with a 45? rotated 2×2 square lattice, referred to the SrTiO&sub3; substrate, in the film plane. The 2.4 nm film adopts a different structure as evidenced by the extinction of particular diffraction peaks and supported by the behavior of the size of the in-plane structural domains. While no important structural changes are detected for the other films as the layer thickness is reduced, T[subc] decreases drastically while the remanent magnetization is constant. T[subc] follows the functional dependence of a mean field approximation for the limitation of the divergence of the spin–spin correlations by the film thickness.


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