Orientation dependence of dielectric behavior of ferroelectric bilayers and multilayers

Huaping Wu; Aiping Liu; Linzhi Wu; Shanyi Du
December 2008
Applied Physics Letters;12/15/2008, Vol. 93 Issue 24, p242909
Academic Journal
A thermodynamic model is presented to describe the dielectric response of ferroelectric bilayers and multilayers with different orientations. Numerical analyses for PbTiO3/SrTiO3 epitaxially heteroepitaxial bilayer films on thick substrates show that complete polarization suppression and gigantic dielectric response occur at approximately 46%, 50%, and 63% of SrTiO3 fraction in the bilayer structures with (111), (110), and (001) orientations, respectively. Our study indicates that the ferroelectric and dielectric performances of ferroelectric bilayers and multilayers can be modified by changing the thicknesses and orientations of component layers, which is an effective approach for the optimization of microwave devices.


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