Abstract Here, the epitaxial growth of Co on Ru(0001) at the ultrathin limit is revisited in order to explore the stabilization of CoRu surface alloy nanostructures. By using scanning tunneling microscopy (STM) and spectroscopy (STS), surface morphology after deposition of Co at different temperatures on a stepped Ru(0001) substrate were investigated. The experimental results indicated a dependence of the growth mode of Co on Ru(0001) on the deposition temperature and surface step density of substrate. Additionally, it was observed the stabilization of an ordered surface alloy made out of two bulk-immiscible elements, Co and Ru, at the step edges of the substrate. Spin-polarized STM analysis of the regions identified as CoRu surface alloying revealed perpendicular magnetic anisotropy.

中文翻译：

---

Co 在阶梯式 Ru(0001) 上的外延生长：CoRu 磁性表面合金的稳定化

摘要 在这里，为了探索 CoRu 表面合金纳米结构的稳定性，重新审视了在超薄极限下 Co 在 Ru(0001) 上的外延生长。通过使用扫描隧道显微镜 (STM) 和光谱学 (STS)，研究了在不同温度下在阶梯式 Ru(0001) 衬底上沉积 Co 后的表面形貌。实验结果表明 Co 在 Ru(0001) 上的生长模式对沉积温度和衬底表面台阶密度的依赖性。此外，观察到由两种本体不混溶元素 Co 和 Ru 制成的有序表面合金在基板的台阶边缘处具有稳定性。对鉴定为 CoRu 表面合金化的区域的自旋极化 STM 分析揭示了垂直磁各向异性。