Fe/Fe-oxide core-shell systems obtained by inert-gas condensation and Au80Fe20 nanostructured alloys prepared by fast-quenching techniques followed by thermal treatment have been studied by polarised small-angle neutron scattering (SANS). The particle-size distribution was derived from the fit of the scattering curves. In the core-shell samples, the results support the model of a magnetic iron core surrounded by a surface layer (oxide shell) with a reduced magnetisation. The SANS measurements on the Au80Fe20 alloys do not show any appreciable magnetic signal, indicating that the iron precipitates have a superparamagnetic behaviour. Thermal treatment induces the formation of small precipitates of atomic size.

Nanostructured systems with GMR behaviour

BARICCO, Marcello
2002-01-01

Abstract

Fe/Fe-oxide core-shell systems obtained by inert-gas condensation and Au80Fe20 nanostructured alloys prepared by fast-quenching techniques followed by thermal treatment have been studied by polarised small-angle neutron scattering (SANS). The particle-size distribution was derived from the fit of the scattering curves. In the core-shell samples, the results support the model of a magnetic iron core surrounded by a surface layer (oxide shell) with a reduced magnetisation. The SANS measurements on the Au80Fe20 alloys do not show any appreciable magnetic signal, indicating that the iron precipitates have a superparamagnetic behaviour. Thermal treatment induces the formation of small precipitates of atomic size.
2002
74
S886
S888
http://www.scopus.com/inward/record.url?eid=2-s2.0-0036999440&partnerID=40&md5=834ee1e983a8f550981284bd956d26a7
Giant magnetoresistance, Iron, Iron oxides, Magnetization, Nanostructured materials, Neutron scattering, Particle size analysis, Quenching, Superparamagnetism; Magnetic iron core, Nanostructured alloy, Small-angle neutron scattering; Gold alloys
I.Bergenti; A.Deriu; L.Savini; E.Bonetti; E.Bosco; M.Baricco
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/116831
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