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Capping effects of Au on Fe/GaAs(001) studied by magneto-optical Kerr effect
Authors:N. Lei
Affiliation:Surface Physics Laboratory, Fudan University, Shanghai 200433, China
Abstract:Molecular beam epitaxially grown Fe on GaAs(001) capped by Au overlayer with variable thickness had been investigated in situ by magneto-optical Kerr effect (MOKE). It is observed that the MOKE intensity as a function of Au film thickness decays much faster than that derived from the well-known Zak's theory. This can be explained by different optical parameters of ultrathin films from bulk values. It is also found that a minimum thickness of 1.4 nm Au is needed to effectively prevent the oxidation of Fe film at 300 K in atmosphere.
Keywords:75.70.Rf   33.55.-b   8.20.Ls
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