INVESTIGADORES
STACHIOTTI Marcelo Gabriel
artículos
Título:
Nanoscale toroidal ferroelectricity in perovskite oxides
Autor/es:
STACHIOTTI, MARCELO; SEPLIARSKY. MARCELO
Revista:
FERROELECTRICS
Editorial:
TAYLOR & FRANCIS LTD
Referencias:
Lugar: Londres; Año: 2012 vol. 427 p. 41 - 51
ISSN:
0015-0193
Resumen:
We applied a first-principles-based atomistic approach to investigate the formation of
dipole patterns in isolated stress-free PbTiO3 nanoparticles of rectangular shape. We
found that a sequence of topological transformations takes place as the aspect ratio of
the nanostructure changes from elongated nanorods to flat nanoplatelets. Of a particular
interest is the formation of a four-vortex state with cores aligned along a closed path.
In this way, the vortex structure forms a ring-shaped torus, and a ferroelectric bubble
is developed at the center of the ring. The thermal properties of the bubbles indicate
that this state is suitable for the development of nanometric ferroelectric devices. Our
results cover, for the first time, the gap between the nanodots and wires and between
the nanodots and thin films, that is between 0D and 1D as well as between 0D and 2D
objects.