Recording characteristics of a bead with higher saturation flux density on the trailing edge pole

Recording characteristics of a MIG type head with different saturation flux density in leading and trailing egde poles are investigated, by using an obliquely oriented thin film tape. The present head has a saturation flux density on the trailing edge pole of 1.3 T, while it is 1.0 T on the leading edge pole. The head is found to exhibit higher reproduced output than a head with a saturation flux density of 1.3 T or 1.0 T on both leading and trailing edge poles, although such high performance of the present head isn't to be observed when it is used with leading and trailing sides alternated. Head field distribution of the present head is supposed to be asymmetric to the head gap center and exhibit relatively larger head field gradient on the trailing side, resulting in narrower transition width in the magnetic layer of the tape.