Ferroelectricity 21 Ferroelectric materials 12 Polarization 10 Technology: general issues 10 Research & information: general 9 History of engineering and technology 8 Two-dimensional 6 Electric fields 5 Domain walls 4 Ferroelectric films 4 Ferroelectric property 4 Ferroelectrics materials 4 Ferromagnetism 4 Metals 4 Physics 4 Research and information: general 4 Thin-films 4 Calculations 3 Chemistry 3 Energy industries and utilities 3 Ferroelectric polarization 3 Ferroelectrics 3 Ferromagnetic materials 3 First principle calculations 3 Multiferroics 3 Nanocomposites 3 Niobium compounds 3 Spontaneous polarizations 3 Thin films 3 Van der Waals forces 3