Perpendicular write process and head design

High-density perpendicular recording—advances, issues, and extensibility

“…Using relationships from Ref. [5], the sensitivity of write efficiency to pole length and width is shown in Fig 4. Since writer width is a major component in track pitch, the impact of track density (narrower writers) on write efficiency is readily seen in Fig. 4.…”

“…Initial calculations for the perpendicular write process were based on the paper by Williams et al [5] that provided the relationship between write efficiency, the write head dimensions (L Pole , W Pole , Flare height), and the magnetic spacings (h, Overcoats, IL, d) of the recording system. A value of B sat ¼ 2:45 T was used, representing the current limit of write pole materials.…”

Analysis and optimization of terabit magnetic recording systems limited by down-track and cross-track write field gradients

“…(3) and A z ðx; y; z; a; b; cÞ given by A z ðx; y; z; a; b; cÞ ¼ tan À1 ðb À yÞjx þ aj ðz À cÞgðx; y; z; Àa; b; cÞ (8) with g as in Eq. (3). The values of these fields for an example case are shown in Fig.…”

“…As perpendicular recording approaches commercialization, many attempts have been made to assess the potential of the technology and its [1][2][3][4][5][6][7][8][9][10]. These assessments vary in the degree to which head fields limit the projected capability of the technology.…”

Analyses of the effect of head imaging on medium demagnetization field in perpendicular recording

“…However, the same issue was raised again recently in order to optimize head and medium designs. 4 A single pole head structure has been suggested for perpendicular recording. But to increase the writing field angle and gradient, a single pole including a trailing shield head design was also proposed.…”