| 摘要 |
PURPOSE:To speed up storage of information and readout, to increase storage capacity and to achieve small size and thin thickness, by providing a photo transmission electrode on the surface of a ferrodielectric thin film. CONSTITUTION:A ferrodielectric thin film 1 is formed with a ferrodielectric substance in which D-E hysteresis shows a steep square characteristic, e.g., a material consisting of BaTiO3 system polycrystal as the major composition. A photo transmission electrode 2 is provided on the surface of the film 1 to constitute a ferrodielectric memory, and laser beam is radiated to an electrode 2 when an electric field with less absolute value than the electric field Ec between the electrodes 2 and 4. Thus, readout/write-in of a truth value ''1'' and truth value ''0'' is made respectively to residual polarizations -Pr and Pr on a curve at a desired location on the film 1. a: laser beam |
