Oxygen Emissions from Single-Crystalline Fe3O4 Surfaces Induced by Low-Energy Ion Bombardments

N.T.H. Kim-Ngan and W. Soszka Institute of Physics, Pedagogical University, Podchorążych 2, 30-084 Kraków, Poland

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Received: 09 01 2006;

Negative-charged ion energy spectra of the Fe3O4 (001) and (111) surface revealed large peaks attributed to the O- recoils from a binary collision. Under Ar+ ion bombardments such an emission was largely affected by the screening effect of the Fe ions. A distinguished peak related to the O+ recoil ions was observed under Ne+ ion bombardments, while such a peak was merged into the high background in the case of Ar+ ion ones. A weak effect from the Verwey transition was found on oxygen emissions. For the (111) surface a small peak characteristic of the O+ recoils from double collisions appeared in the energy spectra around 140-170 K and a minimum was observed in both R+(T) and R-(T) curves under 6 keV Ne+ ion beam.

DOI: 10.12693/APhysPolA.109.715 PACS numbers: 68.35.-p, 61.18.Bn