Depth-dependent magnetic characterization of Fe films on NiO(001)

作者：Luches P^*; Benedetti S; Pasquini L; Boscherini F; Zajac M; Korecki J; Rueffer R; Valeri S

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2010, 268(3-4): 361-364.

DOI：10.1016/j.nimb.2009.09.048

• Iron
• Nickel oxide
• Magnetism
• Mossbauer spectroscopy
• Nuclear resonant scattering of synchrotron radiation Ferromagnetic/antiferromagnetic interfaces

We used nuclear hyperfine spectroscopies and a (57)Fe probe layer approach to Study the depth-dependent magnetic properties of ultrathin Fe films on NiO(0 0 1), a system exhibiting exchange bias. Conversion electron Mossbauer spectroscopy and nuclear resonance scattering of synchrotron radiation were employed. The samples were two Fe films with a thickness (8-10 ML) slightly above the critical thickness for the onset of ferromagnetism at room temperature, in which a 2 ML-thick probe layer, enriched in the,7 Fe Mossbauer isotope, was embedded at different depths from the Fe/NiO interface. Both techniques indicate that inside the film Fe has a metallic character, while at the interface with NiO different Fe phases are present. The main conclusion is that already a few monolayers from the interface with NiO the magnetic properties of Fe are bulk-like.

• 出版日期2010-2