Micromagnetic analysis of bit decay in perpendicular recording media

Enhong Yuan; Jianhua Xue; R. H. Victora

doi:10.1109/TMAG.2003.816278

Micromagnetic analysis of bit decay in perpendicular recording media

Enhong Yuan, Jianhua Xue, R. H. Victora

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

The life time of stored data depends on the storage density as well as the physical properties and microstructure of the media. Perpendicular media for ultra-high density recording needs to have high anisotropy to withstand thermal instabilities over long time. In this study, we used a micromagnetic model based on a scaling method to numerically calculate the percentage of magnetic decay caused by thermal fluctuations after ten years. Realistic grain configurations for 1 Tbit/in² and 125 Gbit/in² recording were used to seek the critical grain magnetization and anisotropy field of magnetic media that are thermally stable for ten years. For less than 10% decay, an H_K of 20 kOe and M_S^grain of 600 emu/cm ³ is required. Alternatively, H_K can be reduced to 16 kOe if M_S^grain is 800 emu/cm³.

Original language	English (US)
Pages (from-to)	2300-2302
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	39
Issue number	5 II
DOIs	https://doi.org/10.1109/TMAG.2003.816278
State	Published - Sep 2003
Event	Intermag 2003: International Magnetics Conference - Boston, MA, United States Duration: Mar 28 2003 → Apr 3 2003

Bibliographical note

Funding Information:
Manuscript received January 6, 2003. This work was supported in part by the National Storage Industry Consortium Extremly High Density Recording (NSIC-EHDR) Program. The authors are with the Electrical and Computer Engineering Department, University of Minnesota, Minneapolis, MN 55455 USA (e-mail: victora@ ece.umn.edu). Digital Object Identifier 10.1109/TMAG.2003.816278

Keywords

Micromagnetics
Perpendicular recording
Perpendicular recording media
Thermal decay

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title = "Micromagnetic analysis of bit decay in perpendicular recording media",

abstract = "The life time of stored data depends on the storage density as well as the physical properties and microstructure of the media. Perpendicular media for ultra-high density recording needs to have high anisotropy to withstand thermal instabilities over long time. In this study, we used a micromagnetic model based on a scaling method to numerically calculate the percentage of magnetic decay caused by thermal fluctuations after ten years. Realistic grain configurations for 1 Tbit/in2 and 125 Gbit/in2 recording were used to seek the critical grain magnetization and anisotropy field of magnetic media that are thermally stable for ten years. For less than 10% decay, an HK of 20 kOe and MSgrain of 600 emu/cm 3 is required. Alternatively, HK can be reduced to 16 kOe if MSgrain is 800 emu/cm3.",

keywords = "Micromagnetics, Perpendicular recording, Perpendicular recording media, Thermal decay",

author = "Enhong Yuan and Jianhua Xue and Victora, {R. H.}",

note = "Funding Information: Manuscript received January 6, 2003. This work was supported in part by the National Storage Industry Consortium Extremly High Density Recording (NSIC-EHDR) Program. The authors are with the Electrical and Computer Engineering Department, University of Minnesota, Minneapolis, MN 55455 USA (e-mail: victora@ ece.umn.edu). Digital Object Identifier 10.1109/TMAG.2003.816278; Intermag 2003: International Magnetics Conference ; Conference date: 28-03-2003 Through 03-04-2003",

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AB - The life time of stored data depends on the storage density as well as the physical properties and microstructure of the media. Perpendicular media for ultra-high density recording needs to have high anisotropy to withstand thermal instabilities over long time. In this study, we used a micromagnetic model based on a scaling method to numerically calculate the percentage of magnetic decay caused by thermal fluctuations after ten years. Realistic grain configurations for 1 Tbit/in2 and 125 Gbit/in2 recording were used to seek the critical grain magnetization and anisotropy field of magnetic media that are thermally stable for ten years. For less than 10% decay, an HK of 20 kOe and MSgrain of 600 emu/cm 3 is required. Alternatively, HK can be reduced to 16 kOe if MSgrain is 800 emu/cm3.

KW - Micromagnetics

KW - Perpendicular recording

KW - Perpendicular recording media

KW - Thermal decay

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ER -

Micromagnetic analysis of bit decay in perpendicular recording media

Abstract

Bibliographical note

Keywords

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