Evaluation of 45° method in characterizing the anisotropy of the perpendicular media

X.W. Wu; P. Asselin; R.J. M. Veerdonk; R. Chantrell

doi:10.1016/j.jmmm.2006.06.022

Evaluation of 45° method in characterizing the anisotropy of the perpendicular media

X.W. Wu, P. Asselin, R.J. M. Veerdonk, R. Chantrell

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

Abstract

The 45° method has become increasingly popular in characterizing the anisotropy energy of perpendicular recording media. However, this method had only been evaluated under the framework of single-domain particle model. In this paper, we evaluate the 45° method using both the Monte-Carlo and LLG simulation by taking into account the grain structure and the inter-granular exchange interactions. The simulations show that multiple domains form during a 45° measurement, even for samples with squareness close to 1. Domain formation becomes less of a problem if a large external field is applied (∼H). These modeling results impose question marks on the advantages for the 45° method and suggest that this method should be applied with caution.

Original language	English
Pages (from-to)	139-143
Number of pages	5
Journal	Journal of Magnetism and Magnetic Materials
Volume	309
Issue number	1
DOIs	https://doi.org/10.1016/j.jmmm.2006.06.022
Publication status	Published - 1 Feb 2007

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title = "Evaluation of 45° method in characterizing the anisotropy of the perpendicular media",

abstract = "The 45° method has become increasingly popular in characterizing the anisotropy energy of perpendicular recording media. However, this method had only been evaluated under the framework of single-domain particle model. In this paper, we evaluate the 45° method using both the Monte-Carlo and LLG simulation by taking into account the grain structure and the inter-granular exchange interactions. The simulations show that multiple domains form during a 45° measurement, even for samples with squareness close to 1. Domain formation becomes less of a problem if a large external field is applied (∼H). These modeling results impose question marks on the advantages for the 45° method and suggest that this method should be applied with caution.",

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AU - Asselin, P.

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AB - The 45° method has become increasingly popular in characterizing the anisotropy energy of perpendicular recording media. However, this method had only been evaluated under the framework of single-domain particle model. In this paper, we evaluate the 45° method using both the Monte-Carlo and LLG simulation by taking into account the grain structure and the inter-granular exchange interactions. The simulations show that multiple domains form during a 45° measurement, even for samples with squareness close to 1. Domain formation becomes less of a problem if a large external field is applied (∼H). These modeling results impose question marks on the advantages for the 45° method and suggest that this method should be applied with caution.

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Evaluation of 45° method in characterizing the anisotropy of the perpendicular media

Abstract

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