{HEAD ~ Current} in the sensor is confined to regions close to the air bearing surface by {TAIL ~ an insulator layer} to enhance reader sensitivity 
{ HEAD ~ Current } in the sensor is confined to regions close to the air bearing surface by { TAIL ~ an insulator layer } to enhance reader sensitivity
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH