摘要
Ferroelectrics are a class of materials with spontaneous electrical polarization, which can be reversed or re-orientated by applying an external electric field [1]. They may also have piezoelectric, pyroelectric and nonlinear optical properties,and thus have wide applications such as those in memory,logic and sensor devices. Particularly, ferroelectric memory devices are non-volatile and have the advantages including low power consumption, high reading and writing speed.
