Invention Grant
US09202565B2 Write method for writing to variable resistance nonvolatile memory element and variable resistance nonvolatile memory device 有权
写入可变电阻非易失性存储器元件和可变电阻非易失性存储器件的写入方法

Write method for writing to variable resistance nonvolatile memory element and variable resistance nonvolatile memory device
Abstract:
A write method for writing to a variable resistance nonvolatile memory element, comprising applying a set of strong recovery-voltage pulses at least once to the variable resistance nonvolatile memory element when it is determined that the resistance state of the variable resistance nonvolatile memory element fails to change to a second resistance state, remaining in a first resistance state, the set of strong recovery-voltage pulses including pulses: (1) a first strong recovery-voltage pulse which has a greater amplitude than a normal second voltage for changing the resistance state to the first resistance state, and has the same polarity as the second voltage; and (2) a second strong recovery-voltage pulse which follows the first strong recovery-voltage pulse and has a longer pulse width than the pulse width of the normal first voltage for changing the resistance state to the second resistance state, and has the same polarity as the first voltage.
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