Analytical prediction of size-induced ferroelectricity in BaO nanowires under stress

Anna N. Morozovska,
Robert Blinc

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Physical Review B - Maryland, USA: American Physical Society (APS), 2010, #81


We predict that a ferroelectric phase can be induced in otherwise nonferroelectric binary oxides like BaO, EuO and Er2O3 by a strong enough stress σμ/R present under the curved surface in nanowires due to intrinsic surface stress μ. Our analytical calculations performed within the Landau-Ginzburg-Devonshire theory prove that BaO nanowires of radius R∼(1–10)nm can be ferroelectric at room temperatures with spontaneous polarization values ∼0.5 C/m2 for typical surface stress coefficients μ∼(10–50)N/m. The same phenomena could lead to high temperature magnetoelectric effect in nanosystems of magnetic binary oxides.