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Conductive LaNiO3 thin films were prepared via a simple solution method to be used as both a buffer layer and a bottom electrode layer, on which Pb(Zr,Ti)O3–CoFe2O4 bi-layered films were also deposited by a similar solution method. The results showed that the LaNiO3 buffer layer could induce a different preferential orientation for the Pb(Zr,Ti)O3 layer in the composite films and thus lead to different ferroelectric behaviour. More importantly, this LaNiO3 buffer obviously enhanced the magnetoelectric response of the Pb(Zr,Ti)O3–CoFe2O4 bi-layered thin films.

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The electronic structures and magnetic properties of FeRuCrP and FeRhCrP quaternary Heusler compounds with LiMgPbSb-type structures have been investigated via first-principles calculations. The calculational results show that both FeRuCrP and FeRhCrP compounds present perfect half-metallic properties: Showing large half-metallic band gaps of 0.39 eV and 0.38 eV, respectively. The total magnetic moments of FeRuCrP and FeRhCrP are 3 μB and 4 μB per formula unit, respectively. The magnetism of them mainly comes from the 3d electrons of Cr atoms and follows the Slater-Paulig behavior of Heusler compounds: Mt = Zt − 24. Furthermore, the half-metallic properties of FeRuCrP and FeRhCrP compounds can be kept in a quite large range of lattice constants (about 5.44–5.82 Å and 5.26–5.86 Å, respectively) and are quite robust against tetragonal deformation (c/a ratio in the range of 0.94–1.1 and 0.97–1.1, respectively). Moreover, the large negative cohesion energy and formation energy of FeRuCrP and FeRhCrP compounds indicate that they can be synthesized experimentally.