Effects of the Aspect Ratio of a Word Line on the Self-Field in the Presence of a Keeper Layer

K. S. Kim; C. E. Lee; S. H. Lim

doi:10.1109/TMAG.2003.816245

Effects of the Aspect Ratio of a Word Line on the Self-Field in the Presence of a Keeper Layer

K. S. Kim, C. E. Lee, S. H. Lim

Department of Physics

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

5 Citations (Scopus)

Abstract

The self-field from a word line containing a soft magnetic keeper layer in the geometry relevant to magnetic random access memory is calculated by using a finite-element method. A significant increase of the self-field is observed by the introduction of the soft magnetic keeper layer. Furthermore, the magnitude of the self-field is found to vary greatly with the aspect ratio of the word line in the presence of the keeper layer. In the aspect ratio range from 0.25 to 16 but at a constant cross-sectional area of 1μm², the self-field initially increases with the increase of the aspect ratio, reaches a maximum at an aspect ratio of 4, and then decreases with the further increase of the aspect ratio. The present results emphasize the importance of optimizing the shape of a word line containing a soft magnetic keeper layer.

Original language	English
Pages (from-to)	2857-2859
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	39
Issue number	5 II
DOIs	https://doi.org/10.1109/TMAG.2003.816245
Publication status	Published - 2003 Sept

Keywords

Aspect ratio
Cladding
Computer simulation
Magnetic random access memory (MRAM)
Self-field
Word line coated with a keeper layer

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2003.816245

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title = "Effects of the Aspect Ratio of a Word Line on the Self-Field in the Presence of a Keeper Layer",

abstract = "The self-field from a word line containing a soft magnetic keeper layer in the geometry relevant to magnetic random access memory is calculated by using a finite-element method. A significant increase of the self-field is observed by the introduction of the soft magnetic keeper layer. Furthermore, the magnitude of the self-field is found to vary greatly with the aspect ratio of the word line in the presence of the keeper layer. In the aspect ratio range from 0.25 to 16 but at a constant cross-sectional area of 1μm2, the self-field initially increases with the increase of the aspect ratio, reaches a maximum at an aspect ratio of 4, and then decreases with the further increase of the aspect ratio. The present results emphasize the importance of optimizing the shape of a word line containing a soft magnetic keeper layer.",

keywords = "Aspect ratio, Cladding, Computer simulation, Magnetic random access memory (MRAM), Self-field, Word line coated with a keeper layer",

author = "Kim, {K. S.} and Lee, {C. E.} and Lim, {S. H.}",

note = "Funding Information: Manuscript received January 6, 2003. This work was supported by the Tera-Level Nanodevices Project (a 21C Frontier Program Funded by the Korean Ministry of Science and Technology). K. S. Kim and C. E. Lee are with the Department of Physics, Korea University, Seoul 136-701, Korea (e-mail: suk@kist.re.kr; rscel@korea.ac.kr). S. H. Lim is with the Nano Device Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea (e-mail: sangho@kist.re.kr). Digital Object Identifier 10.1109/TMAG.2003.816245 Fig. 1. Geometry of the word line without and with a keeper layer. The distance between the word line and the free layer (h) and the keeper layer thickness (d) were fixed at 0.13 and 0.03 m, respectively. The definition of the axes is also shown.",

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N2 - The self-field from a word line containing a soft magnetic keeper layer in the geometry relevant to magnetic random access memory is calculated by using a finite-element method. A significant increase of the self-field is observed by the introduction of the soft magnetic keeper layer. Furthermore, the magnitude of the self-field is found to vary greatly with the aspect ratio of the word line in the presence of the keeper layer. In the aspect ratio range from 0.25 to 16 but at a constant cross-sectional area of 1μm2, the self-field initially increases with the increase of the aspect ratio, reaches a maximum at an aspect ratio of 4, and then decreases with the further increase of the aspect ratio. The present results emphasize the importance of optimizing the shape of a word line containing a soft magnetic keeper layer.

AB - The self-field from a word line containing a soft magnetic keeper layer in the geometry relevant to magnetic random access memory is calculated by using a finite-element method. A significant increase of the self-field is observed by the introduction of the soft magnetic keeper layer. Furthermore, the magnitude of the self-field is found to vary greatly with the aspect ratio of the word line in the presence of the keeper layer. In the aspect ratio range from 0.25 to 16 but at a constant cross-sectional area of 1μm2, the self-field initially increases with the increase of the aspect ratio, reaches a maximum at an aspect ratio of 4, and then decreases with the further increase of the aspect ratio. The present results emphasize the importance of optimizing the shape of a word line containing a soft magnetic keeper layer.

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Effects of the Aspect Ratio of a Word Line on the Self-Field in the Presence of a Keeper Layer

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