The first spin valve may include a first free layer structure; {TAIL ~ a first pinning structure} disposed over the first free layer structure; and a first anti ferromagnetic layer disposed over {HEAD ~ the first pinning structure} 
The first spin valve may include a first free layer structure ; { TAIL ~ a first pinning structure } disposed over the first free layer structure ; and a first anti ferromagnetic layer disposed over { HEAD ~ the first pinning structure }
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD