Perspectives of Magnetic Recording System at 10 Tb/in$^{2}$

Yuan, Zhimin; Liu, Bo; Zhou, Tiejun; Goh, C. J.; Ong, Chun Lian; Cheong, Choon Min; Wang, Li

doi:10.1109/tmag.2009.2029599

Cited by 30 publications

(18 citation statements)

References 16 publications

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“…2 which requires media carbon overcoats that are thinner than 1 nm. 1,2 Decreasing the thickness of conventional carbon overcoats poses significant issues to their tribological and corrosion performance. This necessitates the development of alternative processes in terms of deposition techniques and materials that can help in decreasing the thickness of the overcoat while improving its desired tribological properties which are required for the next generation of magnetic recording.…”

mentioning

confidence: 99%

Ultrathin Si/C graded layer to improve tribological properties of Co magnetic films

Rismani¹,

Samad²,

Sinha³

et al. 2012

Appl. Phys. Lett.

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mentioning

confidence: 99%

Ultrathin Si/C graded layer to improve tribological properties of Co magnetic films

Rismani¹,

Samad²,

Sinha³

et al. 2012

Appl. Phys. Lett.

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“…ξ is set as 60 in our calculation to guarantee the relaxation time of more than 10 years in the working environment [11], [13].…”

Section: B Thermal Stability For Ecc Mediamentioning

confidence: 99%

Angular Dependence of Coercivity and Bit Error Rate Estimation for Shingled Magnetic Recording With ECC Media

Cheng

et al. 2015

IEEE Trans. Magn.

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Shingled magnetic recording (SMR) with exchange-coupled composite media provides a feasible way by enhancing the writing capability and reducing the media switching field for achieving ultrahigh areal density of magnetic storage. However, the media switching field is dependent on the angle between the easy axis and the applied field. The adjacent track encroachment induced by this angular disturbance may happen, which could increase recording noise and lead to measurable erasure. This problem is highlighted in SMR system because of the enlarged stray field. A trapezoidal shingled writing head is modeled to explore the spatial field distribution and how the writing performance is affected by the angular dependence of media coercivity. The results show that a larger easy axis deviation and a smaller anisotropy energy density ratio of hard region will be helpful for reducing switching field to improve writing capability. The analysis also suggests that, if properly arranged, the adjacent bits can suffer minimized encroachment caused by variation of angularly induced switching field and attain a satisfactory bit error rate of as low as <5×10 −4 .Index Terms-Bit error rate (BER), coercivity, exchange-coupled composite (ECC), shingled magnetic recording (SMR), switching field.

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“…It attracts more attention and needs time to get both head-and media-ready. The bitpatterned media is losing its advantage over the granular media with the progress of advanced coding technology and head media improvement [2], [7]. It has the risk to be phased out from the choice of emerging technologies.…”

Section: Introductionmentioning

confidence: 99%

Dedicated Servo Recording System and Performance Evaluation

et al. 2015

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The perpendicular magnetic recording (PMR) in hard disk drives is approaching its physical limitation. The emerging technologies, such as heat assisted magnetic recording and microwave assisted magnetic recording have been proposed to record on magnetic media with thermally stable smaller size grains at higher areal density (AD). However, in the media fabrication, achieving wellisolated small size of grains is more challenging than obtaining high K u material as recording media. Reducing the number of grains per bit is a major path for keeping AD growth of PMR in recent years. To minimize the SNR penalty at a smaller grain number per bit, pushing more on track density is the right approach. With the 2-D magnetic recording (TDMR) readers for inter-track interference cancellation, the off-track read capability is improved significantly for allowing a narrower track read. In the drive working environment, when the external vibration or other mechanical disturbance happens during the writing process, it creates more track squeeze at adjacent tracks and leaves a very narrow track at some locations of the track. When the track width is narrower than the squeeze to death width in the 747 curve, it causes hard failure in the channel. To solve the track squeeze problem, this paper proposes to add an additional magnetic recording layer in between the data recording layer and the soft underlayer of conventional PMR media. This additional recording layer is used to record servo information only. The continuous positioning error signal is able to improve the servo performance and to provide the real-time monitoring of the positioning error. When it is under bad servo conditions, the writing process can be stopped to avoid nontolerable track squeeze. The continuous servo signals are designed to be of moderate intensity at very low frequency, and its impact on data signal has been minimized. The linear density gap between the dedicated servo media and the conventional PMR media is able to be controlled within 3%. As the dedicated servo system keeps only around 100 wedges of track ID and sector ID at the data layer, the surface area saving at the data layer can break even in capacity. The dedicated servo technology together with TDMR readers is the key technology to achieve ultrahigh track density during both writing and reading processes.Index Terms-Continuous position error signal (PES), dedicated servo, dedicated servo media, perpendicular magnetic recording (PMR), servo control.

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Perspectives of Magnetic Recording System at 10 Tb/in$^{2}$

Cited by 30 publications

References 16 publications

Ultrathin Si/C graded layer to improve tribological properties of Co magnetic films

Ultrathin Si/C graded layer to improve tribological properties of Co magnetic films

Angular Dependence of Coercivity and Bit Error Rate Estimation for Shingled Magnetic Recording With ECC Media

Dedicated Servo Recording System and Performance Evaluation

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