Enhanced multiferroic properties and shear coupled grain growth

June 16, 2010

[1] Enhanced multiferroic properties and domain structure of La doped BiFeO3 thin films

F Yan et al

BiFeO3 (BFO) and La-doped BFO (BLFO) thin films are grown on Pt/TiO2/SiO2/Si substrate using pulsed laser deposition. The domain structure of BFO and BLFO are investigated via piezoresponse force microscopy. Highly enhanced ferroelectric properties with great remanent polarization (Pr) of 102 μC/cm2 and decreased leakage current density are obtained via La-doping. Magnetic property is also increased by La doping ascribed to spatial homogenization of spin arrangement. The mechanisms for the enhancement of ferroelectric and ferromagnetic characteristics are discussed.

[2] Experimental method for true in situ measurements of shear-coupled grain boundary migration

T Gorkaya et al

A novel set-up developed to continuously observe and measure stress-driven grain boundary migration is presented. A commercial tensile/compression scanning electron microscope hot stage was utilized for in situ observations of mechanically loaded samples at elevated temperatures up to 850 °C by recording orientation contrast images of bicrystal surfaces. Two sample holders were designed and fabricated for applying a shear stress to the boundary in bicrystals of various geometries. The results of the first measurements in Al bicrystals are presented.


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