Multidimensional Signal Processing for High Areal Density Heated-Dot Magnetic Recording

Saito, Hidetoshi

doi:10.1109/tmag.2022.3213584

Cited by 4 publications

(1 citation statement)

References 20 publications

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“…Bit-patterned magnetic recording (BPMR) can be viewed as one of the most promising technologies for next generation HDDs because it can extend the AD up to 4 Tb/in 2 [1]. Additionally, the BPMR system can also be paired with either the energy-assisted magnetic recording technology known as "heated-dot magnetic recording" or the multi-layer magnetic recording technology [2] to boost the AD up to 10 Tb/in 2 [3]. For a BPMR system, the data bit is recorded on an isolated island surrounded by non-magnetic material, thus solving the problem of transition noise and non-linear transition shift.…”

Section: Introductionmentioning

confidence: 99%

An MLP-based skew angle mitigation method for bit-patterned magnetic recording

Koonkarnkhai,

Kankhunthod,

Kovintavewat

2024

IEICE Electron. Express

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Skew angle (SA) is one of the crucial problems in a bit-patterned magnetic recording (BPMR) system. Practically, during the read process, the read head may be tilted up to 30 degrees ( • ) away from the target track. Without the SA detection and correction mechanism, the performance of the BPMR system will be unbearable. This paper proposes a SA mitigation strategy for a BPMR system based on a multilayer perceptron (MLP) so as to estimate and rectify the SA. Specifically, the MLP-based SA estimator extracts the SA amount directly from the readback signal, which will then be used in the MLP-based detector to produce the estimated recording bits. Simulation results show that the proposed method can estimate the SA embedded in the readback signal more precisely than the conventional one, which just uses a look-up table to detect the SA from the target coefficients. Particularly, for the system operating at an areal density (AD) of 3 terabits per square inch with SA = 15 • and 30 • , the suggested system performs better than the system without the SA mitigation method.

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Section: Introductionmentioning

confidence: 99%

An MLP-based skew angle mitigation method for bit-patterned magnetic recording

Koonkarnkhai,

Kankhunthod,

Kovintavewat

2024

IEICE Electron. Express

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Recording media configurations for double-layered bit-patterned magnetic recording

Buajong,

Warisarn

2024

AIP Advances

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The current magnetic recording technology is approaching its recording density limit. Recently, concepts focused on vertically stacking multiple recording media have gained momentum, driven by the potential to significantly expand recording density. The key challenge for such a system involves methods capable of efficiently separating data originating from the upper and lower layers within a single readback signal. To address this challenge, we first propose two distinct configurations of recording media in bit-patterned magnetic recording (BPMR) system with double recording layers. In both configurations, the centers of islands on the lower layer are positioned at the gaps between magnetic islands on the upper layer. This achieves the separation of the individual layer signals since the centers of islands in both layers are deliberately misaligned. Moreover, the equalizer design that takes the input data from both layers into consideration is also proposed. Simulation results demonstrate that when employing the same detector, the proposed configurations of the double-layered BPMR systems achieve better performance than the single-layered BPMR system.

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A Study of Iterative Signal Processing Schemes for Double-Layered Bit-Patterned Recording

Khametong,

Warisarn

2024

2024 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)

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Multidimensional Signal Processing for High Areal Density Heated-Dot Magnetic Recording

Cited by 4 publications

References 20 publications

An MLP-based skew angle mitigation method for bit-patterned magnetic recording

An MLP-based skew angle mitigation method for bit-patterned magnetic recording

Recording media configurations for double-layered bit-patterned magnetic recording

A Study of Iterative Signal Processing Schemes for Double-Layered Bit-Patterned Recording

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