Abstract
We report multiferroic properties of Pb(Fe1/2Nb1/2)O3 (or PFN) epitaxial thin layers grown on (001), (110), and (111) SrTiO3 substrates with and without a SrRuO3 (SRO) buffer. Our findings are as follows: (i) the constraint stress on (001) substrates is more than ten times larger than those on (110) and (111); (ii) this large constraint stress induces higher piezoelectric constants, magnetic permeability and magnetization for (001) PFN compared with (110) and (111) layers; (iii) epitaxy distorts the structure of (001) PFN causing the films to be weakly ferromagnetic, whereas (110) films are antiferromagnetic; and (iv) a significant increase of the coercivity of (001) layers occurs due to clamping by a SRO buffer layer.
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