Strain analysis of multiferroic BiFeO3-CoFe2O4 nanostructures by Raman   scattering
  We report a Raman scattering investigation of columnar BiFeO3-CoFe2O4 (BFO-CFO) epitaxial thin film nanostructures, where BFO pillars are embedded in a CFO matrix. The feasibility of a strain analysis is illustrated through an investigation of two nanostructures with different BFO-CFO ratios. We show that the CFO matrix presents the same strain state in both nanostructures, while the strain state of the BFO pillars depends on the BFO/CFO ratio with an increasing tensile strain along the out-of-plane direction with decreasing BFO content. Our results demonstrate that Raman scattering allows monitoring strain states in complex 3D multiferroic pillar/matrix composites. 
O. Chaix-Pluchery, C. Cochard, P. Jadhav, J. Kreisel, N. Dix, F.   Sanchez, J. Fontcuberta
cond-mat.mtrl-sci