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 CoxIr1 −  x alloy formation and Ir segregation on the surface.

Carlomagno, I., Drnec, J., Scaparro, A.M., Cicia, S., Vlaic, S., Felici, ., et al. (2016). Co-Ir interface alloying induced by thermal annealing. JOURNAL OF APPLIED PHYSICS, 120, 195302 [10.1063/1.4967845].

Co-Ir interface alloying induced by thermal annealing

CARLOMAGNO, ILARIA;MENEGHINI, CARLO
2016-01-01

Abstract

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 CoxIr1 −  x alloy formation and Ir segregation on the surface.
Carlomagno, I., Drnec, J., Scaparro, A.M., Cicia, S., Vlaic, S., Felici, ., et al. (2016). Co-Ir interface alloying induced by thermal annealing. JOURNAL OF APPLIED PHYSICS, 120, 195302 [10.1063/1.4967845].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/309848
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