Reliability of Sharrocks equation for exchange spring bilayers

被引：58

作者：

Suess, D. ^{[1
]}

Eder, S.

Lee, J.

Dittrich, R.

Fidler, J.

Harrell, J. W.

Schrefl, T.

Hrkac, G.

Schabes, M.

Supper, N.

Berger, A.

机构：

[1] Vienna Univ Technol, Inst Solid State Phys, A-1040 Vienna, Austria

[2] Univ Alabama, MINT Ctr, Tuscaloosa, AL 35487 USA

[3] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA

[4] Univ Sheffield, Dept Mat Engn, Sheffield S10 2TN, S Yorkshire, England

[5] Hitachi Global Storage Technol, San Jose Res Ctr, San Jose, CA 95135 USA

来源：

PHYSICAL REVIEW B | 2007年 / 75卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.75.174430

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A Monte Carlo approach and a modified nudged elastic band method are used to study the dynamic coercivity of interacting particle arrays in particular perpendicular recording media and exchange spring bilayers. Monte Carlo simulations are performed to study the effect of the interactions on the dynamic coercivity of interacting particle arrays. It is shown that the interactions in magnetic recording media only slightly influence the dynamic coercivity. The reliability of energy barrier measurements based upon Sharrock's equation for frequency-dependent coercivity data is investigated using a modified nudged elastic band method. It is shown that the extrapolated energy barrier at zero field may deviate from the correct one by up to 18% if the conventional exponent n=1.5 is assumed. Our micromagnetic simulations furthermore indicate that the accuracy of the extrapolated energy barrier can be improved by about a factor of 3 upon measuring the dynamic coercivity at an angle of 45 degrees and using the exponent n as an additional fit parameter.

引用

页数：11

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