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Effects of hydrogenation on structure and magnetic properties of Fe/La multilayers

机译：氢化对Fe / La多层膜结构和磁性的影响

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摘要

We have studied the effects of hydrogenation on structure and magnetic properties of Fe (3.0 nm)/La (t nm) multilayers at the range of La layer thickness (t) from 0.3 to 4.2 nm. The effects of hydrogenation are the following, (a) All multilayers become a well-defined layered structure, (b) The bilayer thickness (Λ) becomes larger by a lattice expansion of only La layer, (c) The saturation magnetization (M_s)_(Fe) of the multilayers becomes larger. The increment of (M_s)_(Fe) is caused by the disproportionation of the Fe-La mixing layer to the pure Fe layer at the Fe/La interface, (d) The remanence ratio (M_r/M_s) and the saturation field (H_s) reflecting coupling state between the adjacent Fe layers change with increasing La layer thickness: the coupling state changes from a ferromagnetic (FM) state to a non-coupled (NC) state. This changing manner is the same, but the thickness range of spacer layer for FM coupling expands from 1.5 to 1.8 nm. This expansion of the thickness range is due to the change of interface structure and electronic structure caused by La-hydride formation.
机译：我们研究了在La层厚度（t）为0.3到4.2 nm的范围内，氢化对Fe（3.0 nm）/ La（t nm）多层膜的结构和磁性的影响。氢化的作用如下：（a）所有多层均成为定义明确的层状结构，（b）由于仅La层的晶格膨胀，双层厚度（Λ）变大，（c）饱和磁化强度（M_s）多层的_（Fe）变大。 （M_s）_（Fe）的增加是由于Fe-La混合层在Fe / La界面上相对于纯Fe层的歧化所致，（d）剩磁比（M_r / M_s）和饱和场（ H_s）反映相邻的Fe层之间的耦合状态随La层厚度的增加而变化：耦合状态从铁磁（FM）状态变为非耦合（NC）状态。这种改变方式是相同的，但是用于FM耦合的间隔层的厚度范围从1.5nm扩展到1.8nm。厚度范围的这种扩展是由于氢化镧的形成引起的界面结构和电子结构的变化。

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