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

 
Anna N. Morozovska,
  
Robert Blinc
 

Інститут проблем матеріалознавства ім. І. М. Францевича НАН України , вул. Кржижановського 3, Київ, 03142, Україна
Physical Review B - Maryland, USA: Американське Фізичне Суспільство (APS), 2010, #81
http://www.materials.kiev.ua/article/554

Анотація

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.