Investigations of Perpendicular Write Head Design for 1>tex<$hboxTb/in^2$>/tex<

Abstract

We have revisited the considerations of perpendicular recording at 1 Tb/in 2 . We have extensively modeled head designs with the down-track shield (DS) and head designs with the down-track and side shields (DS-SS). The side shields are needed to reduce the thermal erase width, however, there is a substantial reduction in effective write field for the DS-SS heads compared to the DS heads. This reduction in effective write field defines an upper limit for the anisotropy of the medium that can be written. As a consequence, it is hard to simultaneously achieve writability and the thermal stability requirement for 1 Tb/in 2 .Index Terms-Bit-aspect ratio (BAR), effective write field, finite-element model (FEM), micromagnetic model, neighborhood induced transition shift (NITS), perpendicular recording, side shields, signal-to-noise ratio (SNR), soft underlayer (SUL), Tb/in 2 , thermal erase width, transition jitter, transition shift, writability, write width.

Effect of thermal fluctuation field on the noise performance of a perpendicular recording system

“…These are shown as cases 1-12 in Table I for a head design presented previously. 11 The head 1 design includes a down-track shield ͑DS͒. The modeled head has a physical track width of 40 nm, a relatively thick pole ͑320 nm͒, a short throat length ͑20 nm͒, and a head-to-media spacing ͑HMS͒ of 5 nm to maximize the write field.…”

Effects of Head Pole Aspect Ratio and Skew Angle on Areal Density in Perpendicular Recording

“…The head is set as 2.4 T. The medium is determined from the writability criterion that the perpendicular loop closure field cannot exceed the maximum perpendicular head field in (2). The thermal decay level is approximated from the following formula [12]:…”

Optimization of Asymmetric Magnetic Recording Heads Inclination Angle and Study the Characteristics for a Higher Bit Density Recording of HDD

“…This tapered single-pole head structures with tapered shields, incorporating the asymmetric gapped geometry, were also investigated as part of corner-type head designs for high-resolution, two-dimensional magnetic recording (Victora et al, 2012). The idea of validity of utilizing the conventional perpendicular magnetic recording to improve the areal density to reach up to 1 Tb/in2, before upgrading to the heat assisted magnetic recording (HAMR) or patterned media is supported by many researchers (Wood, 2000), and (Batra et al, 2004). Because of the ultrahigh recording density produced by perpendicular magnetic recording, most research focuses on this method rather than, the conventional longitudinal magnetic recording.…”

“…Because of the ultrahigh recording density produced by perpendicular magnetic recording, most research focuses on this method rather than, the conventional longitudinal magnetic recording. The ring-type head is employed along with the single layered media due to its easy implementation to the conventional hard disk technology (Batra et al, 2004). The asymmetric ring head is considered as a good candidate to produce large field gradient and narrow field width, and hence overcoming the fundamental limitations to head field gradients (Wang et al, 1988).…”