Overview of latest work on perpendicular recording media

Abstract

Recent works on perpendicular recording media were reviewed. Co-Cr alloy films are still under improving and show a recording ability of 20 Gbit/in 2 and beyond. New perpendicular recording media that have high perpendicular anisotropy have been developed. These would be candidate media for ultrahigh density recording beyond 100 Gbit/in 2 .

Fabrication of ordered FePt nanoparticles with a cluster gun

“…1,2 Among the prospective materials, the face centered tetragonal ͑fct͒ phases of binary equiatomic FePt and CoPt compounds have attracted significant attention. [3][4][5] The large magnetocrystalline anisotropy of these alloys allows thermal stability of the magnetization in isolated particles with a size as small as a few nm. Narrow size distribution and weak interparticle interaction are other requirements in order to maintain the signal-to-noise ratio within acceptable limits.…”

Magnetic Nanoparticles and Their Applications

“…There is currently a considerable amount of research on sputtered nanocomposite media for magnetic recording. [228][229][230] Here we will focus on work directed toward future media in which nanopatterning is used to decouple the particles from each other, and where the uniformity is sufficient for a single particle to be used to store a bit of information.…”

Advancements in PMR thin-film media

“…In 2000, Ouchi [8] reviewed improvements in decreasing DC noise and transition noise of singleand double-layer HCP CoCr-alloys by increasing S and H c , enhancing magnetic isolation of grains, and reducing the magnetic cluster domain size /D*S.…”

“…In 2000, Ouchi [8] gave an overview of designs and improvements of PMR thin film media in terms of noise and thermal stability. He pointed out that real PMR thin film media of thickness (d) consists of close-packed columnar grains having average grain size /DS and log normal distributions of shapes, separations, easy-axis texture orientations, magnetization switching fields, and intergranular exchange coupling interactions that can induce magnetic cluster domains with average size of /D*S. Wide distributions of magnetic properties, grain sizes, and magnetic cluster domains sizes can induce significant DC bit noise and transition jitter noise.…”