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Monolithic Surface Wave Memory with Long Storage Time

A storage of phase and amplitude (holographic storage) of surface acoustic waves has been realized in an Al/ZnO/SiO2/Si monolithic structure. An injection of electrons from Al into ZnO is utilized to form the charge grating with the periodicity equal to the wavelength of the surface wave. This pattern is stored in trapping centers in ZnO resulting in the storage time longer than 10 h.