We used nuclear hyperfine spectroscopies and a 57Fe 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 Mössbauer 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 57Fe Mössbauer 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.
Titolo: | Depth-dependent magnetic characterization of Fe films on NiO(0 0 1) |
Autore/i: | P. Luches; S. Benedetti; PASQUINI, LUCA; BOSCHERINI, FEDERICO; M. Zajac; J. Korecki; R. Rüffer; S. Valeri |
Autore/i Unibo: | |
Anno: | 2010 |
Rivista: | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.nimb.2009.09.048 |
Abstract: | We used nuclear hyperfine spectroscopies and a 57Fe 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 Mössbauer 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 57Fe Mössbauer 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. |
Data prodotto definitivo in UGOV: | 2010-12-15 18:51:02 |
Appare nelle tipologie: | 1.01 Articolo in rivista |