We have made magnetization and x-ray diffraction measurements on an epitaxial Pb(Fe1/2Nb1/2)O3 200 nm film. From the temperature dependence of the out-of-plane lattice parameter we can assign a Burns' temperature at Td ~ 640 K, a temperature at T* ~ 510 K, related to the appearance of static polar nanoregions, and an anomaly occurring at 200 K. The latter is precisely the N\'eel temperature TN determined from magnetization and points to spin-lattice coupling at TN ~ 200 K. We also observe "weak ferromagnetism" up to 300K and propose superantiferromagnetic clusters as a plausible scenario to explain this hysteresis above TN.Comment: 12 pages, 4 figure

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A key element in ferroic materials is the presence of walls separating domains with different orientations of the order parameter. It is demonstrated that 180 stripe domains in ferroelectric films give rise to very distinct features in their diffuse X-ray scattering (DXS) intensity distributions. A model is developed that allows the determination of not only the domain period but also the period disorder, the thickness and roughness of the domain walls, and the strain induced by the rotation of the polarization. As an example, the model is applied to ferroelectric/paraelectric superlattices. Temperature-dependent DXS measurements reveal that the polarization-induced strain decreases dramatically with increasing temperature and vanishes at the Curie temperature. The motion of ferroelectric domain walls appears to be a collective process that does not create any disorder in the domain period, whereas pinning by structural defects increases the wall roughness. This work will facilitate in situ quantitative studies of ferroic domains and domain wall dynamics under the application of external stimuli, including electric fields and temperature. We have grown tricolour PbTiO 3 /SrTiO 3 /PbZr 0.2 Ti 0.8 O 3 (PT/ STO/PZT) SLs on TiO 2 -terminated (001)-oriented STO substrates using pulsed laser deposition following a procedure research papers 846 A. Boulle et al. Diffuse X-ray scattering from ferroelectric stripe domains J. Appl. Cryst. (2016). 49, 845-855 APPENDIX B Lognormal, Lévy-stable and pseudo-Voigt distributions A lognormal distribution is used to model the p.d.f. of the stripe period: research papers J. Appl. Cryst. (2016). 49, 845-855 A. Boulle et al. Diffuse X-ray scattering from ferroelectric stripe domains 853