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Monte Carlo simulations of magnetization state of ellipsoidal CoCu particles in disordered self-assembled arrays

机译:无序自组装阵列中椭圆形CoCu粒子磁化状态的Monte Carlo模拟

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摘要

Monte Carlo (MC) simulations of the magnetization states of disordered self-assembled arrays of particles consisting of Co_(87)Cu_(13) alloy are investigated. The assemblies of magnetic particles with ellipsoidal shapes and volumes ranging from 5 to 50 μm~3 exhibit densities of about 3 × 10~6 particles per mm~2. Magnetization was obtained in the framework of Stoner-Wohlfarth model extended to include phenomenological contributions of second-order magnetic anisotropy and coercivity mechanism with distinct configuration of easy axes of magnetization. MC simulations for assemblies containing no more than 100 particles with negligible magnetic interaction between each other and exhibiting saturation magnetization and magnetic anisotropy constant values close to those found for cobalt in bulk are in good agreement with experimental results. We evaluate and validate our computational modeling using samples having particles with different sizes and different angular distributions of the easy axis of magnetization. A simple numerical approach with minimum of parameters was used to take into account the coercive fields of the samples. Reasonable simulation results are generated based on realistic size distributions and angular distributions of easy axis of magnetization.
机译:研究了由Co_(87)Cu_(13)合金组成的无序自组装粒子阵列的磁化状态的蒙特卡洛(MC)模拟。椭圆形形状和体积范围从5到50μm〜3的磁性粒子组件的密度为每mm〜2约3×10〜6个粒子。在Stoner-Wohlfarth模型的框架内获得了磁化强度,该模型扩展到包括二阶磁各向异性的现象学贡献和具有易磁化轴独特配置的矫顽力机制。包含不超过100个粒子且彼此之间的磁相互作用可忽略不计并且其饱和磁化强度和磁各向异性常数值接近于散装钴中发现的值的组件的MC模拟与实验结果非常吻合。我们使用具有不同大小和易磁化轴的不同角度分布的粒子的样本评估和验证我们的计算模型。使用具有最少参数的简单数值方法来考虑样品的矫顽场。根据实际大小分布和易磁化轴的角度分布,可以生成合理的模拟结果。

著录项

  • 来源
    《Journal of Materials Research》 |2016年第14期|2058-2064|共7页
  • 作者单位

    Departamento de Fisica, Universidade Federal do Parana, 81531-990, Curitiba, PR, Brazil,Instituto de Fisica, Universidade Federal do Rio Grande do Sul, Av. Bento Goncalves, 9500 - Caixa Postal 15051 - CEP 91501-970 - Porto Alegre, RS, Brazil;

    Departamento de Fisica, Universidade Federal do Parana, 81531-990, Curitiba, PR, Brazil;

    Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, SP, Brazil;

    Laboratorio Associado de Sensores e Materials, Instituto Nacional de Pesquisas Espaciais, CEP 12227-010, Sao Jose dos Campos, SP, Brazil;

    Departamento de Quimica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, SP, Brazil;

    Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, SP, Brazil;

    Departamento de Fisica, Universidade Federal do Parana, 81531-990, Curitiba, PR, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic anisotropy;

    机译:磁各向异性;

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