  We present the evidence of lattice rotation vortices having an average radius
of ~7 nm at the monoclinic ferroelectric domain boundary of
(1-x)Pb(Zn1/3Nb2/3)O3-xPbTiO3 (PZN-xPT, x=0.08). Maps of crystal orientations,
domain configurations, symmetry breaking are obtained using scanning convergent
beam electron diffraction (SCBED). Such measurements suggest the merging of 2D
and 1D topological defects, with implications for domain-switching mechanisms
in relaxor ferroelectric crystals, and the possibility of a new form of
nanoscale ferroelectric devices.
