Air Bearing Simulation for Bit Patterned Media

Abstract

Patterned media are being considered as a promising approach for achieving storage densities beyond 1 Tb/in 2 on hard disks. Patterned media reduce cross talk of adjacent bits and improve thermal stability of the media. In this investigation, the flying characteristics of femtotype sliders over bit patterned media (BPM) are investigated. The discrete bits of the disk are modeled as isolated conical protrusions on the disk surface.

Investigation of Nanoscale Heat Transfer and Flying Characteristics in Thermal Flying Height Control Sliders Considering Near-Field Radiation

“…(7) can be found by fitting reflectivity data reported by Gervais and Piriou [31]. By assuming that the air flow in the head-disk interface is quasi-steady, i.e., the time-dependent effect of the moving protrusions on the flying characteristics of the slider is not considered, a generalized Reynolds equation is used to describe the air bearing attitude of the protruded slider and is shown as [32][33][34] o oX…”

“…To avoid redundancy, the detailed information and explanation of Reynolds equation in head-disk interface can be found in the Refs. [32][33][34].…”

Numerical Simulation of the Head/Disk Interface for Bit Patterned Media

“…In particular, they found that the touchdown velocity and touchdown ambient pressure on discrete track recording disks was higher than on smooth disks. Recently, Li et al [17] bit patterned media on the flying characteristics of a femto-type slider. Their results indicated that the flying height loss of a slider is a function of the media design parameters including bit height, the ratio of bit diameter to bit pitch, bit shape and skew angle.…”