Stabilization and functional properties of La3NiAlMnO9 and La3CoAlMnO9 magnetoelectric triple perovskites

Singh, M. P.; Truong, K. D.; Jandl, S.; Fournier, P.
April 2009
Applied Physics Letters;4/27/2009, Vol. 94 Issue 17, p171908
Academic Journal
Ferromagnetic La3NiAlMnO9 (LNAMO) and La3CoAlMnO9 (LCAMO) triple-perovskite thin films are stabilized in the 750–860 °C temperature range in 100–900 mTorr O2 pressure range using pulsed-laser deposition. The LCAMO and LNAMO films exhibit ferromagnetism up to 190 and 130 K, respectively. The physical properties of these films demonstrate that the B-site 3d cations, Al, Mn, and Co or Ni ions, are structurally short-range ordered. A strong spin-lattice-polarization coupling in LCAMO is confirmed by a large dielectric constant and the onset of phonon softening in the vicinity of the ferromagnetic-to-paramagnetic phase transition.


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