Abstract We report on the growth of a Fe/Co bilayer on W(110) and its electronic and magnetic structure characterization by means of low energy electron diffraction and spin-resolved photoemission spectroscopies. The Co bottom layer, investigated in the thickness range from 2 to 10 monolayers (ML), relaxes immediately to its bulk hcp structure and is therefore used to provide an hexagonal top surface for the growth of metastable Fe films. Notwithstanding the presence of the Co layer, and similar to our previous findings concerning the growth of Fe on a Ni layer [Phys Rev B 94 195155], we report the formation of bcc nuclei, indicative of lattice relaxation, even for a Fe thicknesses as low as 2 ML. For all the Fe/Co thickness combinations and at magnetic remanence, we were able to measure a not nil in-plane spectral spin polarization.

中文翻译：

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在 W(110) 上生长的具有 Co 缓冲层的超薄 Fe 薄膜的电子结构和磁行为

摘要 我们通过低能电子衍射和自旋分辨光电光谱法报道了在 W(110) 上生长的 Fe/Co 双层及其电子和磁结构表征。Co 底层，在 2 到 10 个单层 (ML) 的厚度范围内进行研究，立即松弛为其体 hcp 结构，因此用于为亚稳态 Fe 膜的生长提供六边形顶面。尽管存在 Co 层，并且类似于我们之前关于 Fe 在 Ni 层上生长的发现 [Phys Rev B 94 195155]，我们报告了 bcc 核的形成，表明晶格弛豫，即使对于 Fe 厚度为低至 2 毫升。对于所有 Fe/Co 厚度组合和剩磁，我们能够测量到非零的面内光谱自旋极化。