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Magnetostriction in transversely isotropic hexagonal crystals

机译：横观各向同性六方晶体中的磁致伸缩

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摘要

The simultaneous occurrence of direct and inverse magnetostriction in transversely isotropic hexagonal crystal is theoretically investigated. Particular emphasis is here given to the need of identifying the fourth-order magnetostriction tensor, as it represents the most primitive object from which all related physical quantities of interest in micromagnetism are deduced. For hexagonal crystals, the magnetostriction tensor is expressed in terms of six independent magnetostrictive coefficients whose values are, so far, unknown. Indeed, the existing literature provides just four independent constraints that are extracted from the expression of the differential scalar strain in a given direction. In this work, the two extra conditions required to solve this identification problem are obtained by deducing the explicit functional dependence of the main features characterizing the motion of a magnetic domain wall along the major axis of a thin magnetostrictive nanostrip placed on the top of a thick piezoelectric actuator. The results of our analysis reveal that such two conditions may be associated to the effective anisotropy coefficient and the domain-wall width. To validate our proposal, a comparison with some recent experimental results is also successfully addressed.
机译：理论上研究了横观各向同性六角形晶体中同时出现正磁致伸缩和逆磁致伸缩。这里特别强调需要识别四阶磁致伸缩张量，因为它代表了最原始的物体，从中可以推断出微磁性中所有感兴趣的物理量。对于六方晶体，磁致伸缩张量以六个独立的磁致伸缩系数表示，到目前为止，其值尚不清楚。实际上，现有文献仅提供了四个独立的约束条件，这些约束条件是从给定方向上的标量差分应变表达式中提取的。在这项工作中，通过推导表征主要特征的显着功能依赖关系来明确解决此识别问题所需的两个额外条件，这些主要特征表征了磁畴壁沿着位于厚壁顶部的薄磁致伸缩纳米带的主轴线的运动。压电致动器。我们的分析结果表明，这两个条件可能与有效各向异性系数和畴壁宽度有关。为了验证我们的建议，还成功解决了与一些最新实验结果的比较。

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  • 来源
    《Physical review》 |2020年第1期|014405.1-014405.12|共12页
  • 作者

    Giancarlo Consolo; Salvatore Federico; Giovanna Valenti;

  • 作者单位

    Department of Mathematical Computer Physical and Earth Sciences University of Messina Viale F. Stagno D'Alcontres 31 98166 Vill. S. Agata Messina Italy;

    Department of Mechanical and Manufacturing Engineering The University of Calgary Calgary Alberta Canada T2N 1N4;

    Department of Engineering University of Messina Contrada di Dio 98166 Vill. S. Agata Messina Italy;

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