wherein the set of {TAIL ~ magnetic poles} and {HEAD ~ the gap} are arranged near a recording surface of a magnetic recording medium, 
wherein the set of { TAIL ~ magnetic poles } and { HEAD ~ the gap } are arranged near a recording surface of a magnetic recording medium ,
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH