Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys
Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys
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DOI：
10.2320/matertrans.mt-m2019146
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发表时间：
2019-11
影响因子：
1.2
通讯作者：
Shigeru Suzuki;T. Kawamata;R. Simura;S. Asano;S. Fujieda;R. Umetsu;Masaki Fujita;M. Imafuku;Tsuyoshi Kumagai;T. Fukuda
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文献类型：
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作者：
Shigeru Suzuki;T. Kawamata;R. Simura;S. Asano;S. Fujieda;R. Umetsu;Masaki Fujita;M. Imafuku;Tsuyoshi Kumagai;T. Fukuda
本文综述了体心立方（bcc）结构功能铁基合金磁致伸缩各向异性的研究进展；这些是潜在的铁磁材料，可用于环境温度下的执行器和传感器。这些功能铁基合金（如Fe - Ga、Fe - Al和Fe - Ge合金）的磁致伸缩性能与晶体取向密切相关。在这些功能铁基合金中，观察到体积不守恒的非焦耳磁致伸缩；一般来说，体积内的焦耳磁致伸缩不受磁场的影响。由于这些铁基合金的磁致伸缩性能是通过磁弹性效应与它们的弹性性能相关联的，因此我们也用铁基合金的单晶研究了它们的弹性性能。本文讨论了在外加磁场和外加应力作用下分别发生的磁致伸缩和逆磁致伸缩的各向异性特征。为了阐明磁致伸缩和反磁致伸缩的微观过程，观察了磁场和外加应力对磁畴的影响。结果表明，在外加磁场作用下，功能铁基合金的磁畴结构发生了复杂的变化。例如，在外加磁场或外加应力的作用下，不同类型的布洛赫畴壁沿特定方向运动。畴壁运动的特征可能对应于磁致伸缩和逆磁致伸缩的发生，其中磁致伸缩在交替过程中产生磁通量
This paper provides an overview of recent studies on the anisotropy of magnetostriction of functional iron-based alloys with the body- centered cubic (bcc) structure; these are potential ferromagnetic materials for use in actuators and sensors at ambient temperature. The magnetostrictive properties of these functional iron-based alloys (such as Fe Ga, Fe Al, and Fe Ge alloys) are known to strongly depend on the crystallographic orientation. In these functional iron-based alloys, non-Joulian magnetostriction, in which volume is not conserved, was observed; generally, the Joulian magnetostriction in a volume is not altered by magnetic fi elds. As the magnetostrictive properties of these iron- based alloys are correlated to their elastic properties through the magnetoelastic e ff ect, their elastic properties have also been investigated using single crystals of iron-based alloys. In the present paper, we discuss the characteristic features of the anisotropy of magnetostriction and inverse magnetostriction, which occur when magnetic fi elds and external stresses, respectively, are applied. In order to clarify the microscopic processes underlying the magnetostriction and inverse magnetostriction, the alterations in the magnetic domains by magnetic fi elds and external stresses were observed. The results revealed that the magnetic domain structure in the functional iron-based alloys is altered in a complex manner when applied with external fi elds. For example, it was demonstrated that unique motions of di ff erent types of Bloch domain walls are observed with the application of magnetic fi elds or external stresses along speci fi c directions of single crystals of Fe Ga alloys. The characteristic features of the motion of the domain walls are likely to correspond to the occurrence of magnetostriction and inverse magnetostriction, in which magnetic fl uxes are induced during alternative