Spin-lattice coupling in multiferroic Pb(Fe1/2Nb1/2)O3 thin films

Peng, Wei; Lemée, Nathalie; Karkut, Michael; Dkhil, Brahim; Shvartsman, Vladimir V.; Borisov, Pavel; Kleemann, Wolfgang; Holc, Janez; Kosec, Marija; Blinc, Robert
January 2009
Applied Physics Letters;1/5/2009, Vol. 94 Issue 1, p012509
Academic Journal
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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