Analog read-only memory using gadolinium molybdate

In ferroelectric gadolinium molybdate a stable planar domain wall can be swept through the crystal by applying a voltage along the polar axis. The resulting polarization current can be used to read out analog information stored as a waveform pattern in the electrodes. Using a differential detection scheme, we have demonstrated the reproduction of 4 sec of typical speech stored with a density of 50 sec of speech per cm2.