A Simple Analysis for Magnetic Behaviors of Exchange-Coupled Granular/Continuous Perpendicular Magnetic Recording Media

Kitakami, Osamu; Shimatsu, T.; Muraoka, H.

doi:10.1143/jjap.41.l455

Cited by 1 publication

(1 citation statement)

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“…22 and above, several proposals have been addressed so far to try to solve the 'trilemma' problems. These include percolated perpendicular media, [121][122][123][124][125][126][127][128] bit patterned media, heat assisted media, [153][154][155][156][157][158][159][160][161][162][163][164] continuous granular composite media (CGC) [165][166][167][168][169] and exchange spring media. [170][171][172][173][174][175] Since last two kinds of media (CGC media and exchange spring media) have been well documented in the literature, [165][166][167][168][169][170][171][172][173][174][175] we focus our attention in this section only on the first three cases, in particular, with respect to their principles of magnetism, media development from a viewpoint of materials science, engineering progress so far and directions in the near future.…”

Section: Grain Size Engineeringmentioning

confidence: 99%

Development of high density magnetic recording media for hard disk drives: materials science issues and challenges

Gan¹,

Ren²,

Xiao³

et al. 2009

International Materials Reviews

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The tremendous increase in areal density of hard disk drives is mainly ascribed to harmonic development between magnetic recording media and heads in their scaling, especially allowing a commercial transition from the longitudinal to perpendicular recording system. This paper reviews the main features, recent breakthroughs and future potentials of both the longitudinal and the perpendicular media from a viewpoint of materials science. Special attention is firstly paid to the 'trilemma' problem for the media, i.e. the compromise among writability, thermal stability and signal to noise ratio (SNR). The evolution of media materials these years are then addressed with emphasis on the thermodynamic origin of magnetically induced phase separation of Co-Cr based alloys, which governs media noise and coercivity, and its applications to the current longitudinal media. The materials challenges for media to achieve 500 Gb in. 22 and above are further predicted from the viewpoints of thermal stability improvement and microstructure control of media materials, and their engineering issues have been discussed for the current Co-Cr based alloys, potential FePt and CoPt ordered, phase separated Co-W based alloys and magnetic rare earth compounds. Finally, the future media approaching 1 Tb in. 22 and beyond are addressed with respect to the principles, progress, engineering challenges and future directions.

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