Atomistic simulation of static magnetic properties of bit patterned media

Decrease of a switching field, Hsw, of the magnetic media with high magnetocrystalline anisotropy constant, Ku, can be handled by tilted-easy axis. Not only tilting easy direction of crystal but also optimum magnetic properties can improve writability. The effects of Ku and saturation magnetization, Ms, of L10-CoPt material of BPM with 45° tilted-easy axis are investigated in this article. The object oriented micromagnetic framework package based on Landau - Lifshitz - Gilbert equation has been used to analyze the magnetic properties of media in this paper. The results indicate that the Hsw decreases with decreasing Ku and increasing Ms. To achieve the Hsw lower than the maximum write head field, the Ku and Ms values should not be over 1.30 MJ/m3 and should exceed 0.30 MA/m, respectively.

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Scheme for utilizing the soft feedback information in bit-patterned media recording

2016 Asia-Pacific Magnetic Recording Conference Digest (APMRC) ◽

10.1109/apmrc.2016.7524288 ◽

2016 ◽

Author(s):

Chi Dinh Nguyen ◽

Jaejin Lee

Keyword(s):

Bit Patterned Media ◽

Feedback Information ◽

Patterned Media

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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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Role of Dipolar Interactions on the Thermal Stability of High-Density Bit-Patterned Media

IEEE Magnetics Letters ◽

10.1109/lmag.2012.2211864 ◽

2012 ◽

Vol 3 ◽

pp. 4500204-4500204 ◽

Cited By ~ 18

Author(s):

N. Eibagi ◽

J. J. Kan ◽

F. E. Spada ◽

E. E. Fullerton

Keyword(s):

Thermal Stability ◽

High Density ◽

Dipolar Interactions ◽

Bit Patterned Media ◽

Patterned Media ◽

Thermal Stability Of

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Utilization of multiple read heads for TMR prediction and correction in bit-patterned media recording

AIP Advances ◽

10.1063/1.4972801 ◽

2016 ◽

Vol 7 (5) ◽

pp. 056501 ◽

Cited By ~ 3

Author(s):

W. Busyatras ◽

C. Warisarn ◽

Y. Okamoto ◽

Y. Nakamura ◽

L. M. M. Myint ◽

...

Keyword(s):

Bit Patterned Media ◽

Patterned Media

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Origin of magnetic switching field distribution in bit patterned media based on pre-patterned substrates

Applied Physics Letters ◽

10.1063/1.3623488 ◽

2011 ◽

Vol 99 (6) ◽

pp. 062502 ◽

Cited By ~ 42

Author(s):

B. Pfau ◽

C. M. Günther ◽

E. Guehrs ◽

T. Hauet ◽

H. Yang ◽

...

Keyword(s):

Field Distribution ◽

Patterned Substrates ◽

Switching Field ◽

Bit Patterned Media ◽

Patterned Media ◽

Magnetic Switching ◽

Switching Field Distribution

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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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