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

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

2009-02-27

arxiv.org/abs/0902.4897v1

Appl. Phys. Lett. 94, 012509 (2009)

Physics

Condensed Matter

Materials Science

12 pages, 4 figures

Scientific paper

10.1063/1.3067872

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.

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