کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5425341 | 1395854 | 2008 | 9 صفحه PDF | دانلود رایگان |

The growth morphology of iron on Au(7Â 8Â 8) has been investigated from 45Â K to 430Â K by use of variable temperature scanning tunneling microscopy. This system displays an ordered growth regime of a nanodots array from 70Â K to 300Â K (room temperature, RT). According to the temperature, the dots are found to grow on two different sites: below 250Â K, they form rounded isolated islands above the steps where local traps act as nucleation centers; from 250Â K to 300Â K, they have the shape of platelets regularly disposed along the bottom of the step edges and located on face centered cubic area of the Au(7Â 8Â 8) surface reconstruction. Above RT, as a function of temperature, we find a progressive transition of the growth morphology, from ordered platelets to a step flow growth. A surface alloy formation induced by the high step density is the driving force of this growth mode transition.
Journal: Surface Science - Volume 602, Issue 1, 1 January 2008, Pages 28-36