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