Readout circuit of magnetic memory

In an example, a determination circuit determines whether an input waveform is a first waveform (=0) or a second waveform (=1). When magnetization switching is caused during writing, the second waveform (=1) having a large voltage change is outputted, and thus the determination circuit determines that the output waveform is the second waveform, using threshold determination or the like. In another example, when an initial voltage V agrees with a voltage V stored by intentionally writing "0", "0" is outputted; when V disagrees with V, "1" is outputted. In the disagreement case, the written data is rewritten into the original data "1."