{HEAD ~ a first magnetic metal layer} which is provided between the first magnetic material layer and the first surface of {TAIL ~ the first nonmagnetic layer}, and includes at least one element selected from Fe, Co and Ni; and 
{ HEAD ~ a first magnetic metal layer } which is provided between the first magnetic material layer and the first surface of { TAIL ~ the first nonmagnetic layer } , and includes at least one element selected from Fe , Co and Ni ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH