Publication Type
Journal
Journal Name
Physical Review Letters
Publication Date
Page Number
174125
Volume
82
Issue
17
Abstract
We investigated nonequilibrium domain wall dynamics under an ac field by measuring the hystere-
sis loops of epitaxial ferroelectric capacitors at various frequencies and temperatures. Polarization
switching is induced mostly by thermally activated creep motion at lower frequencies, and by vis-
cous °ow motion at higher frequencies. The dynamic crossover between the creep and °ow regimes
unveils two frequency-dependent scaling regions of hysteresis loops. Based on these findings, we
constructed a dynamic phase diagram for hysteretic ferroelectric domain dynamics in the presence
of ac fields.
