CoCrPtO-Based Granular Composite Perpendicular Recording Media

Jung, Hongsik; Vélu, E.; Malhotra, S.S.; Kwon, U.; Suess, Dieter; Bertero, G.

doi:10.1109/tmag.2007.892859

Cited by 17 publications

(13 citation statements)

References 10 publications

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“…Two different H/S stacked media, HS1 and HS2, were prepared for this study as summarized in Table 1 and compared with conventional CL media described elsewhere [3]. HS1 and HS2 start with the same Mag1 bottom layer, 9 nm-thick CoCrPt-oxide with a hexagonal close packed (HCP) structure.…”

Section: Methodsmentioning

confidence: 99%

“…In current capping layer (CL) [2,3] and coupled granular/continuous (CGC) media [4], higher intergranular exchange coupling constant (A ex ) in a top magnetic layer improved the signal-to-noise ratio (SNR) and thermal stability. However, the increase in A ex also increased magnetic write width (MWW) and transition noise, which limit areal density.…”

Section: Introductionmentioning

confidence: 99%

“…It was reported [5] that a soft layer with in-plane K u provides much smaller thermal energy barrier than a soft layer with out-of-plane K u . In this paper, the effect of t Soft on media properties in H/S stacked media with two kinds of soft top layers of CoTaZr-SiO 2 and low Pt-containing CoCrPtO alloys is investigated and compared to media properties in conventional CL media [3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of media properties between hard/soft stacked composite and capping layer perpendicular recording media

Jung

Vélu

Malhotra

et al. 2008

Journal of Magnetism and Magnetic Materials

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of media properties between hard/soft stacked composite and capping layer perpendicular recording media

Jung

Vélu

Malhotra

et al. 2008

Journal of Magnetism and Magnetic Materials

Self Cite

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“…This length is half of the grain size in the granular layer, which is about 7.5 nm (Jung et al 2007). So, slippage of the crystal plane causes the demagnetization.…”

Section: Tem Analyses and Discussionmentioning

confidence: 99%

Mechanism study of scratch-induced demagnetization for perpendicular magnetic disks

Furukawa

Shimizu

et al. 2009

Microsyst Technol

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The mechanism for scratch-induced demagnetization was studied in perpendicular magnetic recording (PMR) disks. Scratches, which may occur on a disk's surface during head/disk contact, cause demagnetization, which results in read/write errors. Scratch-induced demagnetization is thus a serious issue. Scratch depths and demagnetization were compared using prototype PMR disks. We confirmed that demagnetization due to scratch depths were different because of the disk structures such as the cap and granular layers through observation using atomic force and magnetic force microscopy. We found that crystal planes in the grains of the granular layer slipped under the scratches, where demagnetization was observed from transmission electronic microscopy cross-sectional analyses of those disks. Scratch-induced demagnetization was mainly caused by plastic deformation of the grain due to crystal plane slippage in the granular layer. Therefore, a grain structure that is dense and cannot easily slip is needed to produce reliable hard disk drives.

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“…2, a PMR disk is typically composed of several material layers on a substrate, such as an overcoat and a granular layer, etc. (Choe 2005;Jung 2007). The overcoat protects the underlying layers from scratches or corrosion.…”

Section: Principle Of Magnetic Damage Evaluationmentioning

confidence: 99%

A novel methodology for quantitative evaluation of scratch-induced magnetic damage in perpendicular magnetic recording disks

Furukawa

2011

Microsyst Technol

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We proposed a methodology for determining the demagnetization effect (magnetic damage) created by scratches on the surface of the perpendicular magnetic recording disks of a hard disk drives (HDDs). Scratches, which may occur on the disk's surface during head and disk contact, result in read and write errors on the HDD. Investigating the amount of magnetic damage is thus an important issue. In this study, the scratched area composed of scratches having a fine pitch and shallow depth were generated, and Kerr loop measurements on the normal and scratched area were conducted. Magnetic damage was then estimated from the difference of Kerr loops. By comparing the results of the proposed methodology with the results of a previous methodology using a magnetic force microscopy, it was confirmed that the proposed methodology can be used to quantitatively evaluate scratch-induced magnetic damage.

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CoCrPtO-Based Granular Composite Perpendicular Recording Media

Cited by 17 publications

References 10 publications

Comparison of media properties between hard/soft stacked composite and capping layer perpendicular recording media

Comparison of media properties between hard/soft stacked composite and capping layer perpendicular recording media

Mechanism study of scratch-induced demagnetization for perpendicular magnetic disks

A novel methodology for quantitative evaluation of scratch-induced magnetic damage in perpendicular magnetic recording disks

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