The trilayer stack has {HEAD ~ two free layers} separated by a nonmagnetic layer and {TAIL ~ a biasing magnet} positioned at the rear of the stack and separated from the air bearing surface 
The trilayer stack has { HEAD ~ two free layers } separated by a nonmagnetic layer and { TAIL ~ a biasing magnet } positioned at the rear of the stack and separated from the air bearing surface
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL 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