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Abstract

A ratio tW/pL of a track width tW to a width pL of an end face, in a traveling direction, of a main pole which performs recording or reproduction on or from the magnetic recording layer of a medium, and a saturation magnetic flux density Bs. (T: tesla) of a magnetic material constituting the main pole satisfy: (A.sub.1 .times.Bs+B.sub.1).sup.2 +C.sub.1 .ltoreq.tW/pL.ltoreq.(A.sub.2 .times.Bs+B.sub.2).sup.2 +C.sub.2 for A.sub.1 =4.3.times..delta.+0.4, B.sub.1 =-16.2.times..delta.-0.3, C.sub.1 =2.2.times..delta.+0.3, A.sub.2 =378.times..delta..sup.2 -66.times..delta.+4.2, B.sub.2 =264.times..delta..sup.2 -43.times..delta.+2.1, and C.sub.2 =9.times..delta.-2.5 where .delta. (.mu.m) is a distance from the end face of the main pole to the soft magnetic under layer.

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