a second magnetic metal layer which is provided between the second magnetic material layer and {TAIL ~ the second surface} of the first nonmagnetic layer, and which includes at least one element selected from {HEAD ~ Fe}, Co and Ni, the second magnetic metal layer being exchange coupled to the second magnetic material layer, and having a damping constant smaller than that of the second magnetic material layer, 
a second magnetic metal layer which is provided between the second magnetic material layer and { TAIL ~ the second surface } of the first nonmagnetic layer , and which includes at least one element selected from { HEAD ~ Fe } , Co and Ni , the second magnetic metal layer being exchange coupled to the second magnetic material layer , and having a damping constant smaller than that of the second magnetic material layer ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH