Co-Ir interface alloying induced by thermal annealing

Using angular resolved X-ray Photoelectron Spectroscopy (XPS), Magneto Optic Kerr Effect (MOKE) and X-ray Absorption Spectroscopy (XAS), we characterize the structural and magnetic evolution upon annealing of two thin Co films (8 and 9 Monolayers) deposited on Ir(111). The XAS data collected in the...

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Bibliographic Details
Published in:Journal of applied physics 2016-11, Vol.120 (19)
Main Authors: Carlomagno, I., Drnec, J., Scaparro, A. M., Cicia, S., Vlaic, S., Felici, R., Meneghini, C.
Format: Article
Language:English
Subjects:
Annealing
Cobalt base alloys
Iridium
Kerr magnetooptical effect
Magnetic domains
Spectrum analysis
Thin films
X ray absorption
X ray photoelectron spectroscopy
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Summary:Using angular resolved X-ray Photoelectron Spectroscopy (XPS), Magneto Optic Kerr Effect (MOKE) and X-ray Absorption Spectroscopy (XAS), we characterize the structural and magnetic evolution upon annealing of two thin Co films (8 and 9 Monolayers) deposited on Ir(111). The XAS data collected in the near Co K edge region (XANES), interpreted with ab-initio simulations, show that intermixing takes place at the Co-Ir interface. Using a linear combination analysis, we follow the intermixing during the thermally driven diffusion process. At 500 °C, the interface between Co and Ir(111) roughens slightly, but no alloy formation is detected. At 600 °C, the Co film loses integrity and MOKE data show a rearrangement of the magnetic domains. Annealing to higher temperatures results in Co x Ir1 −  x alloy formation and Ir segregation on the surface.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4967845