Various alternative embodiments are used to improve the efficiency of the head by channelling {HEAD ~ the magnetic flux} outside {TAIL ~ the gap} 
Various alternative embodiments are used to improve the efficiency of the head by channelling { HEAD ~ the magnetic flux } outside { TAIL ~ the gap }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL