NONVOLATILE STORAGE DEVICE, AND ITS OPERATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a nonvolatile storage device using a variable resistor for a storage component, and to provide its operation method. SOLUTION: This storage device includes a first electrode 12 and a second electrode 14, and a variable resistor 16 interposed between the first electrode 12 and the second electrode 14. The variable resistor 16 is characterized in that it has a critical voltage and its resistance-voltage characteristic is switched at a voltage of the critical voltage or above, thereby a resistance value for a read-out voltage after the switching becomes larger than that before the switching. The operation method of the storage device includes a procedure that two or more write-in voltages higher than the initial critical voltage are set and the write-in voltages provide data values to the storage device by switching it respectively. A read-out voltage lower than the initial critical voltage is set, and the data value is discriminated by measuring a current flowing through the variable resistor 16 with the read-out voltage. COPYRIGHT: (C)2008,JPO&INPIT