Segregation and interdiffusion in (Fe,Co)/Pt superlattices
2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 79, no 8, 085428- p.Article in journal (Refereed) Published
We report on the chemical structure of (Fe,Co)/Pt superlattices, which recently have shown high uniaxial magnetocrystalline anisotropy combined with high saturation magnetic moments. In particular, the homogeneity of the (Fe,Co) alloy is studied with a combination of x-ray and neutron reflectometry-the latter in a configuration where magnetic scattering is negligible. It is deduced, with support from off-specular x-ray reflectivity patterns and corresponding simulations, that the lower (Fe,Co)-on-Pt interface contains more Co than the upper Pt-on-(Fe,Co) interface. This can occur as Co interdiffuses into Pt more easily than Fe, as shown by density-functional calculations. The effect of this interdiffusion and segregation on the uniaxial anisotropy is discussed, and it is found that the previously observed discrepancy between experimental and theoretical anisotropy values can be quantitatively accounted for.
Place, publisher, year, edition, pages
2009. Vol. 79, no 8, 085428- p.
chemical interdiffusion, cobalt alloys, density functional theory, iron alloys, magnetic anisotropy, magnetic moments, metallic superlattices, neutron reflection, platinum, segregation, X-ray reflection
IdentifiersURN: urn:nbn:se:uu:diva-129889DOI: 10.1103/PhysRevB.79.085428ISI: 000263816000090OAI: oai:DiVA.org:uu-129889DiVA: diva2:345567