辐照CaF2表面的导电纳米点
Conductive nanodots on the surface of irradiated CaF2
摘要：
用快重离子斜角辐照CaF_2（111）单晶表面，在其表面形成了纳米级的小丘链。为了表征这些纳米点相对于它们的导电性，我们已经应用了非接触式原子力显微镜使用的磁性尖端。在UHV以及在环境条件下的测量揭示了磁性尖端和纳米点之间明显增强的电磁相互作用。每个循环的耗散能量与金属的值相当，表明离子与靶材料的相互作用导致在表面上产生金属Ca纳米点。
英文摘要：
CaF2(111) single crystal surfaces have been irradiated with swift heavy ions under oblique angles resulting in chains of nanosized hillocks. In order to characterize these nanodots with respect to their conductivity we have applied non-contact atomic force microscopy using a magnetic tip. Measurements in UHV as well as under ambient conditions reveal a clearly enhanced electromagnetic interaction between the magnetic tip and the nanodots. The dissipated energy per cycle is comparable to the value found for metals, indicating that the interaction of the ion with the target material leads to the creation of metallic Ca nanodots on the surface.
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