The sensor stack includes a free layer that is biased by {TAIL ~ direct exchange coupling} with a layer of {HEAD ~ antiferromagnetic material}  
The sensor stack includes a free layer that is biased by { TAIL ~ direct exchange coupling } with a layer of { HEAD ~ antiferromagnetic material }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH