Effects of stress and defects on hydrogenation and magnetic properties in (111) fiber-textured palladium cobalt alloy films
Effects of stress and defects on hydrogenation and magnetic properties in (111) fiber-textured palladium cobalt alloy films
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DOI：
10.1016/j.ijhydene.2020.02.118
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发表时间：
2020-04
影响因子：
7.2
通讯作者：
T. Harumoto;Ji Shi;Yoshio Nakamura
中科院分区：
文献类型：
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作者：
T. Harumoto;Ji Shi;Yoshio Nakamura
应力和缺陷对（111）纤维织构钯钴Pd92Co8（at. %）氢化和磁性能的影响合金薄膜的研究使用后退火工艺。结果表明，张应力引起的氢稳定化对加氢反应产生了多种影响。缺陷去除导致金属α相的溶解度极限增加和形成氢化物β相的临界氢压力增加。结果表明，局部应变可以用线性函数来描述这些效应。改善的抗膜屈曲性也归因于缺陷去除。因此，后退火是控制氢化的一个强有力的过程;然而，效果是复杂的，因为各种效果共同起作用。相反，磁性可以用简单的术语来解释。饱和磁化强度线性对应于具有负斜率的缺陷浓度，并且磁各向异性与由于磁弹性耦合引起的应力成比例。
Effects of stress and defects on the hydrogenation and magnetic properties of (111) fiber-textured palladium cobalt Pd92Co8(at.%) alloy films are investigated using post-annealing process. It is revealed that the hydrogen stabilization due to tensile stress induces various effects on hydrogenation. Defect removal results in an increased solubility limit for the metallicα-phase and an increased critical hydrogen pressure to form the hydrideβ-phase. It was demonstrated that the local strain can depict these effects using a linear function. The improved resistance against film buckling is also attributed to the defect removal. Thus, post-annealing is a powerful process to control hydrogenation; however, the effects are complicated because various effects work in conjunction. In contrast, the magnetic properties can be explained in simple terms. The saturation magnetization corresponds linearly to the defect concentration with a negative slope, and the magnetic anisotropy is proportional to the stress due to magnetoelastic coupling.