論文

査読有り
2017年6月

Three-dimensional magnetic domain structure in a model with exchange randomness

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
  • Terufumi Yokota

432
開始ページ
532
終了ページ
538
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.jmmm.2017.02.031
出版者・発行元
ELSEVIER SCIENCE BV

Surface magnetic domain structure can be different from internal one. Both of them are influenced by structural randomness. Three-dimensional numerical simulations are performed using a model with random exchange interactions and dipolar interactions on a lattice with the periodic boundary condition for the horizontal directions to simulate infinite system in the directions and with the free boundary condition for vertical direction (z ) to represent the existence of surface. The lattice sizes are 64x64x(2Lz+1)64x64x(2L(z)+1) for Lz = 1,2,4 L-z=1,2,4 and 32 x 32 x (2L(z) + 1)32 x 32 x (2L(z) + 1) for Lz=8, 16 L-z=8,16. To simulate highly anisotropic materials, time dependent GinzburgLandau equation using a model with Ising symmetry is solved numerically. Dependence of magnetic domain patterns on thickness of the system and the degree of disorder is investigated for systems with small thickness. Magnetic structure factor for the surface layer is compared with that for the internal layer. The inverse of the wave number that gives the maximum value of the magnetic structure factor depends on the thickness of the system T as T-0.3 approximately. The distribution of the local magnetization depends on the disorder rather differently for different thicknesses of the system. (C) 2017 Elsevier B.V. All rights reserved.

リンク情報
DOI
https://doi.org/10.1016/j.jmmm.2017.02.031
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000399601600080&DestApp=WOS_CPL
ID情報
  • DOI : 10.1016/j.jmmm.2017.02.031
  • ISSN : 0304-8853
  • eISSN : 1873-4766
  • Web of Science ID : WOS:000399601600080

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