Surface alloy formation of Fe on Cr(100) studied by scanning tunneling microscopy

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Surface alloy formation of Fe on a Cr(100) surface was studied using a UHV scanning tunneling microscope. As we deposited Fe of less than 1 ML at room temperature and subsequently annealed the substrate at temperatures between 200 degrees C and 300 degrees C, we observed that Fe atoms incorporate into the Cr(100) surface, forming a well-ordered surface alloy of Fe(0.5)Cr(0.5). These two elements were differentiated by imaging at the bias voltages near their surface states. The surface alloying was also confirmed by imaging at the bias voltages of their Shockley image states. By annealing the Fe layer of similar to 1 ML at 250 degrees C, we found that the solubility of Fe into the Cr(100) surface is similar to 25% at that temperature. Fe overlayer shows kinetically roughened mound structure at room temperature while it shows equilibrium two-dimensional islands at 300 degrees C. [S0163-1829(99)06115-9].
Publisher
AMER PHYSICAL SOC
Issue Date
1999-04
Language
English
Article Type
Article
Keywords

IMAGE STATES; GROWTH MODE; STM; CR; FE/CR/FE(100); MONOLAYER; INTERFACE; FE(001)

Citation

PHYSICAL REVIEW B, v.59, no.16, pp.10918 - 10922

ISSN
1098-0121
DOI
10.1103/PhysRevB.59.10918
URI
http://hdl.handle.net/10203/72907
Appears in Collection
PH-Journal Papers(저널논문)
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