Vibrational spectroscopy of ordered oxygen adiayers on Ni/Cu(001) and Co/Cu(001) thin film systems |
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Authors: | Jae-Sung Kim Mohamed H. Mohamed L.L. Kesmodel |
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Affiliation: | Department of Physics, Indiana University, Bloomington, IN 47405, USA |
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Abstract: | We report surface vibrations in c(2 × 2) oxygen adlayers on Ni and Co thin films on a Cu(001) substrate measured at gG by high resolution EELS. For the Ni thin film surface, one phonon peak is measured for varying film thicknesses from 1.3 ML (monolayer) to 6 ML with a constant energy of 221 cm−1. For the Co thin film surface, three loss peaks are found, whose relative intensities change as the film thicknesses are varied. One loss peak at ˜520 cm−1 is tentatively assigned to the Fuchs-Kliewer mode of cobalt oxide (CoO). The other two peaks at 317 and 376 cm−1 are likely related to different bonding sites. Surface phonons on the p(2 × 2) Co thin film (389 cm−1) and a bulk resonance mode (115 cm−1) are also reported. |
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