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