A combined method for testing a sol-gel derived strontium bismuth tantalate (SBT) film for non-volatile ferroelectric RAM memories (NVFERAM) that combine fatigue and retention measurements is compared with the conventional one. It results more alike to how a memory cell works in a RAM. Differences between both methods are described and results are discussed on the base of a pining/depining process of domains. A complementary measurement method which based on a programmable logic device has been developed that provides digital responses, to test a ferroelectric capacitor as a single storage cell in a manner close to how a RAM works in a computer, following the measuring strategy of the combined method. Voltage signals are used to write and read information in a small capacitor used as memory cell, evaluating the film before its insertion into the integrated device.
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Ramos et al. (2004) studied this question.
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