Abstract
It is well known, that there are two possible switching mechanism in ferroelectric crystals and films (see f.e. A.Tagantsev et al, Domains in Ferroic Crystals and Thin Films, Springer, 2010). The first mechanism, which follows from mean field theory of Landau-Ginzburg, is homogeneous one and does not connect domains. This mechanism was never observed before 1998. The second mechanism, connected with nucleation and domains movement is common for the ferroelectrics and well known from the time of domain discovery (1956). In the present paper the existence of homogeneous mechanism of switching in ultrathin copolymer films is definitely confirmed. The results of the present paper permit to suppose, that homogeneous switching exists in other ultrathin ferroelectric films with thickness near to the critical one.
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