{HEAD ~ a second phase} changing {TAIL ~ layer} arranged between the second voltage application electrode and the second opposing electrode 
{ HEAD ~ a second phase } changing { TAIL ~ layer } arranged between the second voltage application electrode and the second opposing electrode
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH