wherein, the second voltage application electrode comprises a transparent electrode formed over {TAIL ~ a surface} of {HEAD ~ the second phase} changing layer and a voltage supply portion with a resistance that is lower than that of the transparent electrode, and 
wherein , the second voltage application electrode comprises a transparent electrode formed over { TAIL ~ a surface } of { HEAD ~ the second phase } changing layer and a voltage supply portion with a resistance that is lower than that of the transparent electrode , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH