Application of the grain flipping probability model to heat assisted magnetic recording

Heat assisted magnetic recording (HAMR) is often lauded as one of the key technologies poised to replace conventional granular magnetic recording (CGMR). Conventional recording is expected to eventually fail because as the information-bearing grains continue to shrink, they become thermally unstable...

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Main Authors: Eason, Kwaku, Radhakrishnan, Rathna Kumar, Sari Shafidah Shafiee, Elidrissi, Moulay Rachid, Wang, Hong Tao, Chan, Kheong Sann, Guan, Yong Liang
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2013
Online Access:https://hdl.handle.net/10356/79771
http://hdl.handle.net/10220/9205
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-797712020-03-07T13:57:23Z Application of the grain flipping probability model to heat assisted magnetic recording Eason, Kwaku Radhakrishnan, Rathna Kumar Sari Shafidah Shafiee Elidrissi, Moulay Rachid Wang, Hong Tao Chan, Kheong Sann Guan, Yong Liang School of Electrical and Electronic Engineering Heat assisted magnetic recording (HAMR) is often lauded as one of the key technologies poised to replace conventional granular magnetic recording (CGMR). Conventional recording is expected to eventually fail because as the information-bearing grains continue to shrink, they become thermally unstable and will spontaneously flip due to excitations from the ambient temperature. HAMR grains are smaller and have larger anisotropies making them thermally stable, but unwritable at room temperature. Heat from a laser is applied to assist during the writing. The grain flipping probability (GFP) model has been proposed to model and predict the densities achievable in conventional recording systems. In this work we modify the GFP to include a circular hot-spot of a laser as a 2 D Gaussian and predict the expected ensities that might be achieved on HAMR media with 4 nm grains. In this work we examine the effect of varying the hot-spot diameter, the hot-spot peak, and the alignment of the hot-spot to the magnetic footprint profile. Published version 2013-02-20T07:52:08Z 2019-12-06T13:33:46Z 2013-02-20T07:52:08Z 2019-12-06T13:33:46Z 2012 2012 Journal Article Sari Shafidah Shafiee, Elidrissi, M. R., Wang, H. T., Eason, K., Radhakrishnan, R. K., Chan, K. S., & Guan, Y. L. (2012). Application of the grain flipping probability model to heat assisted magnetic recording. Journal of Applied Physics, 111(7), 07B714-. 0021-8979 https://hdl.handle.net/10356/79771 http://hdl.handle.net/10220/9205 10.1063/1.3679141 en Journal of Applied Physics © 2012 American Institute of Physics. This paper was published in Journal of Applied Physics and is made available as an electronic reprint (preprint) with permission of American Institute of Physics. The paper can be found at the following official DOI: [http://dx.doi.org/10.1063/1.3679141].  One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
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language English
description Heat assisted magnetic recording (HAMR) is often lauded as one of the key technologies poised to replace conventional granular magnetic recording (CGMR). Conventional recording is expected to eventually fail because as the information-bearing grains continue to shrink, they become thermally unstable and will spontaneously flip due to excitations from the ambient temperature. HAMR grains are smaller and have larger anisotropies making them thermally stable, but unwritable at room temperature. Heat from a laser is applied to assist during the writing. The grain flipping probability (GFP) model has been proposed to model and predict the densities achievable in conventional recording systems. In this work we modify the GFP to include a circular hot-spot of a laser as a 2 D Gaussian and predict the expected ensities that might be achieved on HAMR media with 4 nm grains. In this work we examine the effect of varying the hot-spot diameter, the hot-spot peak, and the alignment of the hot-spot to the magnetic footprint profile.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Eason, Kwaku
Radhakrishnan, Rathna Kumar
Sari Shafidah Shafiee
Elidrissi, Moulay Rachid
Wang, Hong Tao
Chan, Kheong Sann
Guan, Yong Liang
format Article
author Eason, Kwaku
Radhakrishnan, Rathna Kumar
Sari Shafidah Shafiee
Elidrissi, Moulay Rachid
Wang, Hong Tao
Chan, Kheong Sann
Guan, Yong Liang
spellingShingle Eason, Kwaku
Radhakrishnan, Rathna Kumar
Sari Shafidah Shafiee
Elidrissi, Moulay Rachid
Wang, Hong Tao
Chan, Kheong Sann
Guan, Yong Liang
Application of the grain flipping probability model to heat assisted magnetic recording
author_sort Eason, Kwaku
title Application of the grain flipping probability model to heat assisted magnetic recording
title_short Application of the grain flipping probability model to heat assisted magnetic recording
title_full Application of the grain flipping probability model to heat assisted magnetic recording
title_fullStr Application of the grain flipping probability model to heat assisted magnetic recording
title_full_unstemmed Application of the grain flipping probability model to heat assisted magnetic recording
title_sort application of the grain flipping probability model to heat assisted magnetic recording
publishDate 2013
url https://hdl.handle.net/10356/79771
http://hdl.handle.net/10220/9205
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