the making, on the magnetic material and the insulating material 8, of an insulating layer 8 having, at {TAIL ~ its center}, {HEAD ~ a part M} which has no insulating material and leaves the magnetic material free 
at
the making , on the magnetic material and the insulating material 8 , of an insulating layer 8 having , at { TAIL ~ its center } , { HEAD ~ a part M } which has no insulating material and leaves the magnetic material free
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH