Size effects of ferroelectric and magnetoelectric properties of semi-ellipsoidal bismuth ferrite nanoparticles

摘要: Abstract Bismuth ferrite (BiFeO 3 ) is one of the most promising multiferroics with a sufficiently high ferroelectric (FE) and antiferromagnetic (AFM) transition temperatures, magnetoelectric (ME) coupling coefficient at room temperature. So BiFeO highly sensitive to impact cross-influence applied electric magnetic fields. According urgent demands nanotechnology miniaturize working elements for ultra-high density data storage in advanced nonvolatile memory cells, it very important reduce sizes multiferroic nanoparticles self-assembled arrays without serious deterioration their properties. This work studies size effects phase diagrams, FE ME properties semi-ellipsoidal clamped rigid conductive substrate. The spatial distribution spontaneous polarization vector inside nanoparticles, diagrams paramagnetoelectric (PME) were calculated framework modified Landau-Ginzburg-Devonshire (LGD) approach. Analytical expressions derived dependences temperature, average polarization, linear dielectric susceptibility PME on particle general case different semi-axes a, b height c . analyses obtained results leads conclusion that effect rather aspect ratio direction, less absolute values sizes.