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Role of boundaries in micromagnetic calculations of magnonic spectra of arrays of magnetic nanoelements

机译：边界在磁性纳米元素阵列的镁磁光谱的微磁计算中的作用

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摘要

We have used micromagnetic simulations performed with open and periodic boundary conditions to study the influence of the presence of array boundaries on the spectra and spatial profiles of collective spin-wave excitations in arrays of magnetic nanoelements. The spectra and spatial profiles of collective spin waves excited in isolated arrays of nanoelements and those forming a part of quasi-infinite arrays are qualitatively different even if the same excitation field is used in the simulations. In particular, the use of periodic boundary conditions suppresses the excitation of nonuniform collective modes by uniform excitation fields. However, the use of nonuniform excitation fields in combination with periodic boundary conditions is shown to enable investigation of the structure of magnonic dispersion curves for quasi-infinite arrays (magnonic crystals) in different directions in the reciprocal space and for different magnonic bands. The results obtained in the latter case show a perfect agreement with those obtained with the dynamical matrix method for infinite arrays of nanoelements of the same geometry and magnetic properties.
机译：我们使用在开放和周期性边界条件下进行的微磁模拟来研究阵列边界的存在对磁性纳米元素阵列中集体自旋波激发的光谱和空间分布的影响。即使在模拟中使用相同的激发场，在隔离的纳米元素阵列中激发的集体自旋波的光谱和空间分布以及在准无限阵列中形成的光谱和空间分布在质上也不同。特别地，周期性边界条件的使用通过均匀的激发场抑制了非均匀的集体模态的激发。但是，结合使用非均匀激发场和周期性边界条件，可以研究互易空间中不同方向上的准无限阵列（强磁晶体）和不同强磁带的强磁弥散曲线的结构。在后一种情况下获得的结果与动力学矩阵方法获得的结果完全吻合，该动力学矩阵方法用于相同几何形状和磁性的纳米元素的无限阵列。

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  • 来源
    《Physical review》 |2013年第17期|326-336|共11页
  • 作者

    O. Dmytriiev; V. V. Kruglyak; M. Franchin; H. Fangohr; L. Giovannini; F. Montoncello;

  • 作者单位

    School of Physics, University of Exeter, Exeter, EX4 4QL, United Kingdom;

    School of Physics, University of Exeter, Exeter, EX4 4QL, United Kingdom;

    Engineering and the Environment, University of Southampton, SO17 1BJ, United Kingdom;

    Engineering and the Environment, University of Southampton, SO17 1BJ, United Kingdom;

    Dipartimento di Fisica, Universita di Ferrara, Via G. Saragat 1, 44122 Ferrara, Italy;

    Dipartimento di Fisica, Universita di Ferrara, Via G. Saragat 1, 44122 Ferrara, Italy;

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  • 正文语种 eng
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  • 关键词

    numerical simulation studies; spin waves;

    机译：数值模拟研究;自旋波;

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