{HEAD ~ a first nonmagnetic layer} which is provided between the first and second magnetic material layers, and has a first surface facing the first magnetic material layer and {TAIL ~ a second surface} facing the second magnetic material layer 
{ HEAD ~ a first nonmagnetic layer } which is provided between the first and second magnetic material layers , and has a first surface facing the first magnetic material layer and { TAIL ~ a second surface } facing the second magnetic material layer
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH