Magnetic and read/write performance of CoCrTaPt perpendicular media

Nagaoka, Toru; Baldwin, C.; Payne, A. P.

doi:10.1109/20.490141

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…As evident from [156,157], the hysteresis loops were not 'square', that is, the remanent magnetization of the then mostly used CoCrPtTa was considerably less than the saturation magnetization. The noise associated with the non-square media was apparently of not much concern, but the thermal stability of the media rendered a successful operation of the recording system useless.…”

Section: A Problem 1: 'Media Relaxation'mentioning

confidence: 98%

The transition from longitudinal to perpendicular recording

Richter¹

2007

J. Phys. D: Appl. Phys.

255

164

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After more than 30 years of research, hard disk drives using perpendicular recording are finally commercially available. This review is a follow-up of a review written in 1999 and addresses the basic physics of perpendicular recording with special emphasis on the read and the write process and the magnetic aspects of the recording media. The paper also surveys various technical difficulties which prevented an earlier implementation of perpendicular recording. The paper closes with a short overview of alternative technologies that allow even higher storage densities.

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Section: A Problem 1: 'Media Relaxation'mentioning

confidence: 98%

The transition from longitudinal to perpendicular recording

Richter¹

2007

J. Phys. D: Appl. Phys.

255

164

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“…The addition of Pt to a CoCrTa perpendicular medium also increases the signal amplitude at high linear density [5]. These two reports suggest that adding Pt to the Cr-rich CO-Cr medium is an effective method for increasing the signal amplitude and obtaining a high S/N.…”

Section: Introductionmentioning

confidence: 94%

High signal-to-noise ratio of a Cr-rich CoCrPt perpendicular medium with a large medium thickness

et al. 1997

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A Cr-rich (Co72Cr28)94Pt6 perpendicular medium with a large thickness of 300 nm, integrated with an MR head designed for longitudinal recording, achieved a high signal-tonoise ratio of 37 dB at 100 kFCI and a D50 of 150 WCT. A high Pt content of 17-22 at.% is effective for increasing the Hk value and signal amplitude at 10 WCI, and for decreasing the write demagnetization. However, it also decreases the S/N at 100 kF'CI and the D50. The signal amplitude rapidly increases with the Pt content from 0 to 6 at.%, and saturates at around 6 at.%. This contributes to the high S/N obtained at a Pt content of 6-11 at.%. Compared with a longitudinal medium optimized for the same MR head, the proposed medium has a 2 dB higher S/N at 100 VCI, a 1.3 times larger Dsa, and a 1.5 times larger signal amplitude at 10 WCI. The thickness of the medium will contribute to the thermal stability of magnetic bits at future high recording density of 10 Gbits/inz and beyond.

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“…However, magnetic fluctuations formed inside the recorded bits due to the demagnetizing field cause medium noise and signal output decay. Especially, the output decay becomes more serious [4,5], when the magnetic grain size is decreased to reduce the medium noise [6,7]. In this study, we investigate the relationships between remanent magnetization decay, recorded signal output decay and magnetic properties of CoCr-alIoy single-layer perpendicular recording media.…”

Section: Introductionmentioning

confidence: 99%

Magnetization Decay in CoCr-alloy Perpendicular Magnetic Recording Media

et al. 1997

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The magnetization decay in CoCr-alloy perpendicular magnetic recording media has been investigated. Both remanent magnetization and recorded signal output decay rates of CoCrPtTa medium increase with decreasing magnetic layer thickness. The decay rates can be kept small by controlling the microstructure of magnetic layer by employing a CoCr35/TiCr 10 dualunderlayer. CoCrPt media with the dual-underlayer have high Mr/Ms ratio (Mr/M s > 0.95) and show little decay of remanent magnetization and recorded signal output, though the magnetic layer is very thin (25 nm) and is composed of small grains. It is possible to prepare perpendicular media comprising a Co-based alloy with Mr/Ms > 0.95, which is an important factor to suppress the recorded signal decay rate within an acceptable level.

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Magnetic and read/write performance of CoCrTaPt perpendicular media

Cited by 11 publications

References 12 publications

The transition from longitudinal to perpendicular recording

The transition from longitudinal to perpendicular recording

High signal-to-noise ratio of a Cr-rich CoCrPt perpendicular medium with a large medium thickness

Magnetization Decay in CoCr-alloy Perpendicular Magnetic Recording Media

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