Grain Rotation in 2D-Hexagonal Systems with Competing

RICARDO J.PIGNOL; LEOPOLDO R. GÓMEZ; WALTER BAST; DANIEL A. VEGA

La Plata - Argentina

Workshop; HFILP 35; 2005

We look at a grain rotation mechanism in a bidimentional pattern forming system exhibiting an hexagonal phase. This mechanism is believed to be relevant in the coarsening process of a variety of physical systems with short and long range competing interactions. We focus on the Cahn-Hilliard model with thermal fluctuations. The grain rotation process is uncovered from the dynamical evolution of a misoriented circular grain surrounded by an otherwise perfect crystal.