The Problem of the Devaluation of Education in the Age of Media Noise

1991 ◽

Vol 49 ◽

pp. 776-777

Author(s):

Takao Suzuki ◽

Hossein Nuri

Keyword(s):

Grain Size ◽

Amorphous Film ◽

Nitrogen Atmosphere ◽

Optical Recording ◽

Garnet Film ◽

Media Noise ◽

Garnet Films ◽

Order Of Magnitude ◽

A New Technique ◽

A Current

For future high density magneto-optical recording materials, a Bi-substituted garnet film ((BiDy)3(FeGa)5O12) is an attractive candidate since it has strong magneto-optic effect at short wavelengths less than 600 nm. The signal in read back performance at 500 nm using a garnet film can be an order of magnitude higher than a current rare earth-transition metal amorphous film. However, the granularity and surface roughness of such crystalline garnet films are the key to control for minimizing media noise.We have demonstrated a new technique to fabricate a garnet film which has much smaller grain size and smoother surfaces than those annealed in a conventional oven. This method employs a high ramp-up rate annealing (Γ = 50 ~ 100 C/s) in nitrogen atmosphere. Fig.1 shows a typical microstruture of a Bi-susbtituted garnet film deposited by r.f. sputtering and then subsequently crystallized by a rapid thermal annealing technique at Γ = 50 C/s at 650 °C for 2 min. The structure is a single phase of garnet, and a grain size is about 300A.

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Improved detection for magnetic recording systems with media noise

IEEE Transactions on Magnetics ◽

10.1109/20.617728 ◽

1997 ◽

Vol 33 (5) ◽

pp. 2779-2781 ◽

Cited By ~ 26

Author(s):

J. Caroselli ◽

S.A. Altekar ◽

P. McEwen ◽

J.K. Wolf

Keyword(s):

Magnetic Recording ◽

Media Noise

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Determination of Bit Patterned Media Noise Based on Island Perimeter Fluctuations

IEEE Transactions on Magnetics ◽

10.1109/tmag.2012.2201138 ◽

2012 ◽

Vol 48 (11) ◽

pp. 4574-4577 ◽

Cited By ~ 1

Author(s):

Laurens Alink ◽

J. P. J. Groenland ◽

Jeroen de Vries ◽

Leon Abelmann

Keyword(s):

Bit Patterned Media ◽

Patterned Media ◽

Media Noise

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Turbo-detection for Multilayer Magnetic Recording Using Deep Neural Network-based Equalizer and Media Noise Predictor

10.1109/tmrc53175.2021.9605105 ◽

2021 ◽

Author(s):

Amirhossein Sayyafan ◽

Ahmed Aboutaleb ◽

Benjamin J. Belzer ◽

Krishnamoorthy Sivakumar ◽

Simon Greaves

Keyword(s):

Neural Network ◽

Magnetic Recording ◽

Deep Neural Network ◽

Media Noise ◽

Turbo Detection

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Media noise suppression by multimodal optical disc readout

ODS 2021: Industrial Optical Devices and Systems ◽

10.1117/12.2593573 ◽

2021 ◽

Author(s):

Kimihiro Saito

Keyword(s):

Noise Suppression ◽

Optical Disc ◽

Media Noise

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Quantifying information rate increase by constrained codes for recording channels with media noise

Electronics Letters ◽

10.1049/el:20030561 ◽

2003 ◽

Vol 39 (11) ◽

pp. 852

Author(s):

Zheng Zhang ◽

T.M. Duman ◽

E.M. Kurtas

Keyword(s):

Rate Increase ◽

Information Rate ◽

Constrained Codes ◽

Media Noise ◽

Recording Channels

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Combating Media Noise for High-Density Optical Recording

2007 IEEE International Conference on Communications ◽

10.1109/icc.2007.1036 ◽

2007 ◽

Author(s):

K. Cai ◽

Y. N. Foo ◽

J. W. M. Bergmans

Keyword(s):

Optical Recording ◽

High Density ◽

Media Noise

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Target and Equalizer Design for High-Density Bit-Patterned Media Recording

ECTI Transactions on Computer and Information Technology (ECTI-CIT) ◽

10.37936/ecti-cit.201262.54334 ◽

1970 ◽

Vol 6 (2) ◽

pp. 128-135

Author(s):

Santi Koonkarnkhai ◽

Phongsak Keeratiwintakorn ◽

Piya Kovintavewat

Keyword(s):

Partial Response ◽

Mean Squared Error ◽

Bit Patterned Media ◽

Patterned Media ◽

Media Noise ◽

Minimum Mean Squared Error ◽

Squared Error ◽

Cross Track ◽

Partial Response Maximum Likelihood ◽

Better Than

In bit-patterned media recording (BPMR) channels, the inter-track interference (ITI) is extremely severe at ultra high areal densities, which significantly degrades the system performance. The partial-response maximum-likelihood (PRML) technique that uses an one-dimensional (1D) partial response target might not be able to cope with this severe ITI, especially in the presence of media noise and track mis-registration (TMR). This paper describes the target and equalizer design for highdensity BPMR channels. Specifically, we proposes a two-dimensional (2D) cross-track asymmetric target, based on a minimum mean-squared error (MMSE) approach, to combat media noise and TMR. Results indicate that the proposed 2D target performs better than the previously proposed 2D targets, especially when media noise and TMR is severe.

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