Abstract
This study aims to investigate the impact that factors such as skew, radius, and transition curvature have on areal density capability in heat-assisted magnetic recording hard disk drives. We explore a “ballistic seek” approach for capturing in-situ scan line images of the magnetization footprint on the recording media, and extract parametric results of recording characteristics such as transition curvature. We take full advantage of the significantly improved cycle time to apply a statistical treatment to relatively large samples of experimental curvature data to evaluate measurement capability. Quantitative analysis of factors that impact transition curvature reveals an asymmetry in the curvature profile that is strongly correlated to skew angle. Another less obvious skew-related effect is an overall decrease in curvature as skew angle increases. Using conventional perpendicular magnetic recording as the reference case, we characterize areal density capability as a function of recording position.
Highlights
Areal density growth in modern hard disk drives (HDD) is becoming increasingly difficult to achieve as Perpendicular Magnetic Recording (PMR) approaches the super paramagnetic limit of ∼1Tb/in[2]
Consistent with observations reported in a previous study,[4] we see the transition profile in Heat-Assisted Magnetic Recording (HAMR) becoming increasingly asymmetrical as skew angle is introduced
In addition to the increased profile asymmetry, another less obvious skew-related sensitivity found in HAMR is a decrease in the amount of transition curvature that occurs as skew angle is increased
Summary
Areal density growth in modern hard disk drives (HDD) is becoming increasingly difficult to achieve as Perpendicular Magnetic Recording (PMR) approaches the super paramagnetic limit of ∼1Tb/in[2]. Heat-Assisted Magnetic Recording (HAMR) is on the verge of becoming the generation of high-density magnetic recording technology. By using a laser to provide temporary localized heating of the media during the recording process, HAMR enables media designs with smaller magnetic grains than PMR while maintaining thermal stability. A deeper understanding of the unique recording characteristics in an HDD environment is a critical step in the maturity of HAMR as it continues to make progress towards production. This study investigates the interaction between transition shape and recording position, and the impact it has on recording performance
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