A spin polarized He metastable beam investigation of the adsorption of L-cysteine on magnetic surfaces

作者：Lavagnino L; Moroni R; Bisio F; Terreni S; Mattera L; Canepa M^*

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2011, 269(9): 932-935.

DOI：10.1016/j.nimb.2010.12.017

• Metastable He beam
• Metastable deexcitation spectroscopy
• L-Cysteine
• Self-assembled monolayers
• Iron
• Surface magnetism
• Molecular spintronics

We report first results on the deposition of L-cysteine (Cys), a fundamental amino-acid, on a magnetic substrate. Molecules have been deposited under ultra-high vacuum conditions on Fe(100) films. Electronic and magnetic properties of adsorbed molecules have been investigated by spin polarized metastable deexcitation spectroscopy (SPMDS). The spectra show a growth dynamics apparently similar to the one already reported on coinage metal surfaces with the formation of a strongly-bound thiolate species (S-Fe bond) and weakly-bound second-layer molecules. SPMDS revealed the spin-polarized character of an Auger (Penning) deexcitation peak related to a Cys molecular orbital. Interestingly, these spin-polarization effects, ascribed to the interaction with the magnetized substrate, vanish before the first layer completion, suggesting a possible correlation with the SAM assembly properties.

• 出版日期2011-5-1