A method for switching the direction of polarization in a relatively small
domain in a thin-film ferroelectric material whose direction of
polarization is oriented normal to the surface of the material involves a
step of moving an electrically-chargeable tip into contact with the
surface of the ferroelectric material so that the direction of
polarization in a region adjacent the tip becomes oriented in a
preselected direction relative to the surface of the ferroelectric
material. The tip is then pressed against the surface of the
ferroelectric material so that the direction of polarization of the
ferroelectric material within the area of the ferroelectric material in
contact with the tip is reversed under the combined effect of the
compressive influence of the tip and electric bias.