Effect of oxygen surfactant on the magnetic and structural properties of Co films grown on Cu(110)
Effect of oxygen surfactant on the magnetic and structural properties of Co films grown on Cu(110)
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氧表面活性剂对Cu(110)上Co薄膜磁性和结构性能的影响
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
M. Salmeron
中科院分区：
文献类型：
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作者：
W. Ling;Z. Qiu;O. Takeuchi;D. Ogletree;M. Salmeron
研究发现，以O为表面活性剂，可以在Cu（110）衬底上生长出原子级平坦的Co（110）薄膜。为了获得详细的知识上的影响O的生长，以及对Co覆盖层的磁性，我们进行了调查，该系统使用俄歇电子能谱（AES），低能电子衍射（LEED），表面磁光克尔效应（SMOKE），和扫描隧道显微镜（STM）。以O作为表面活性剂，Co（< 1 ML）的初始生长导致平坦的单层结构。当Co的厚度大于1 ML时，三维团簇开始形成。这些集群成为有序的岛屿在3 ML Co和合并在约5 ML Co。以上5 ML Co，逐层生长恢复。未观察到Cu偏析。在室温下的SMOKE研究表明，Co膜是磁性的超过约5 ML Co，与磁化易轴沿着[001]方向。另一方面，在不使用氧作为表面活性剂的情况下，Co在Cu（110）上三维生长。Co覆盖层的易磁化轴沿着[001]方向，但在室温下在11 ML Co处观察到磁化开始。
It was found that atomically flat Co(110) film could be grown on Cu(110) using O as a surfactant. To obtain detailed knowledge on the effect of O on the growth, as well as on the magnetic properties of Co overlayer, we carried out an investigation on this system using Auger Electron Spectroscopy (AES), Low Energy Electron Diffraction (LEED), Surface Magneto-Optic Kerr Effect (SMOKE), and Scanning Tunneling Microscopy (STM). With O as a surfactant, the initial growth of Co (< 1 ML) results in a flat monolayer structure. When the Co is thicker than 1 ML, three-dimensional clusters begin to form. These clusters become ordered islands at 3 ML Co and coalesce at about 5 ML Co. Above 5 ML Co, layer-by-layer growth resumes. No Cu segregation is observed. SMOKE studies at room temperature show that the Co film is magnetic above about 5 ML Co, with the magnetization easy axis along the [001] direction. On the other hand, without using oxygen as a surfactant, Co grows three-dimensionally on Cu(110). The Co overlayer has its easy magnetization axis along the [001] direction, but the onset of the magnetization was observed at 11 ML Co at room temperature.