Growth and characterization of ultrathin cobalt ferrite films on Pt(111)
نویسندگان
چکیده
CoFe2O4 thin films (5 nm and 20 thick) were grown by oxygen assisted molecular beam epitaxy on Pt(111) at 523~K subsequently annealed 773 K in vacuum or oxygen. They characterized in-situ using Auger Electron Spectroscopy, Low-Energy Diffraction, Scanning Tunneling Microscopy Conversion M\"ossbauer Spectroscopy. The as-grown composed of small, nanometric grains. Annealing the produced an increase grain size gave rise to magnetic order room temperature, although with a fraction remaining paramagnetic state. also induced cobalt segregation surface thicker films. measured spectra low temperature indicative ferrite, both showing very similar hyperfine patterns. affected cationic distribution, which was closer that expected for inverse spinel case annealing atmosphere.
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ژورنال
عنوان ژورنال: Applied Surface Science
سال: 2022
ISSN: ['1873-5584', '0169-4332']
DOI: https://doi.org/10.1016/j.apsusc.2022.152672