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