No abstract

3 1 0 > e 0 8 v) .-.-0 6 -U 0 4 -b, m 0 24 2 0 2 -E Abstrud-hnpruvement of high linear density response of shielded MR heads by introducing perpendicular magnetic recording is discussed. A theoretical estimation shows that narrower pulse width can be obtained with the same MR head than in longitudinal recording. A 200 nm shield gap MR head and a differentiator demonstrate D , of 270 kFRPI and PW, of 140 nm. SN ratio at high densities is also improved with the differentiation. (a) perpendicular --flying height= 50 nm -recording layer= 50 nrn -shield gap= 200 nm ----L-.= 00-=--"---J

No abstract

MR heads have again tried to be introduced in perpendicular magnetic recording [1], [2]. However, so far, their high density performance is not good enough considering the extremely high density response obtained by inductive single pole heads [3] . In this paper, we apply a vertical MR head [2], [4] with a narrow shield gap of 200 nm to improve the resolution. A differentiator [5], which transforms the read response of MR head mto the one obtained by the single pole head, increases a D , by about 50 %. A Dm of 270 kFRPI has thus attained. The SN ratio of the differentiated high density signal is also improved.A perpendicular double layer medium was used with a 50 nm thick recording layer. The linear velocity at the medium was 5 m/s. A single pole head was dedicated for writing, because its D,, is superior to that of ring heads for the medium. The single pole head had a main pole of 200 nm in thickness. A vertical MR head with a narrow shield gap of 200 nm was used as a read head. The flying height of the head is 50 nm. The differentiator was built using a high-speed operational amplifier.

No abstract