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Spin-lattice coupling in multiferroic Pb (Fe1/2Nb 1/2)O3 thin films

Abstract : We 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 Néel temperature TN determined from magnetization and points to spin-lattice coupling at TN∼200 K. We also observe “weak ferromagnetism” up to 300 K and propose superantiferromagnetic clusters as a plausible scenario to explain this hysteresis above TN.
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W. Peng, N. Leḿe, M. Karkut, B. Dkhil, V.V. Shvartsman, et al.. Spin-lattice coupling in multiferroic Pb (Fe1/2Nb 1/2)O3 thin films. Applied Physics Letters, American Institute of Physics, 2009, 94 (1), pp.012509. ⟨10.1063/1.3067872⟩. ⟨hal-02269652⟩

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