We study the structure of an interface in a three dimensional Ising system created by an external non-uniform field $H({ \bf r},t)$. $H$ changes sign over a two dimensional plane of arbitrary orientation. When the field is pulled with velocity ${ \bf v}_e$, (i.e. $H({ \bf r},t) = H({ \bf r - v_e}t)$), the interface undergoes a several dynamical transitions. For low velocities it is pinned by the field profile and moves along with it, the distribution of local slopes undergoing a series of commensurate-incommensurate transitions. For large ${ \bf v}_e$ the interface de-pinns and grows with KPZ exponents.
Categories: cond-mat.stat-mech