Narrow-track antisymmetric dual magnetoresistive head performance on rigid media

Narrow-track differential head: performance on longitudinal and perpendicular disk media

“…Micromagnetic simulations [8] indicated that such a magnetic configuration could provide the transducer with considerably higher efficiency at small aspect ratios of track width to stripe 0018-9464/02$17.00 © 2002 IEEE height and better off-track capability. These predictions were confirmed with an A-DMR head fabricated into a nano-slider by Trindade et al [9]. In that work, we analyzed head-signal amplitude and pulse shape, roll-off and spectral response, cross-track profile, off-track response and adjacent-track interference, obtained with longitudinal media with a memu/cm .…”

“…10, which was well fit with a very large transition parameter, indicates that the recording process in the dual-layer perpendicular medium had considerably lower performance than those attained with longitudinal recording media. A large transition parameter is predicted by (9), with the experimental parameters of head-media separation of 40 nm (typical for disk angular velocity of 7200 rpm), medium remanent magnetization, emu/cc, and thickness, nm. Despite the fact that (9) assumes that the medium has a squareness 1, it indicates that a thin-film media with a large ratio of is unfavorable to attain high linear bit densities.…”

“…The thin-film inductive head used high magnetization poles of FeAlN [18] that were trimmed by focus ion beam etching to a width of 2.5 m [9], [18]. The recording signals were sensed with a DMR head having a track width of 2 m. Both write and read heads used nano-sliders.…”