Structural and magnetic properties of Al2O3/Ni81Fe19 thin films: From superparamagnetic nanoparticles to ferromagnetic multilayers
2005 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 17, no 33, 5027-5036 p.Article in journal (Refereed) Published
Al2O3/Ni81Fe19 multilayer films were produced by sequential magnetron sputter deposition on thermally oxidized Si(001) substrates. By varying the thickness of the Ni81Fe19 layer from 8 to 30 Aa, while keeping the other parameters unchanged, one can control the film structure from nanoclusters to continuous multilayers. The nanoclustered sample is superparamagnetic while the continuous samples show ferromagnetic behavior. The magnetic moments per atom of the Ni81Fe19 layers decrease with decreasing amt. of metallic deposits, indicating the presence of nonmagnetic layers at the interfaces. The thicknesses of these layers are âˆŒ1 Aa for the flat continuous film and 3.8 Aa for the nanoclustered film. The existence of nonmagnetic layers may be interpreted in terms of the formation of antiferromagnetic oxides at the interfaces. [on SciFinder(R)]
Place, publisher, year, edition, pages
2005. Vol. 17, no 33, 5027-5036 p.
magnetron sputtering alumina iron nickel multilayer magnetism structure
IdentifiersURN: urn:nbn:se:kth:diva-78469DOI: 10.1088/0953-8984/17/33/007ISI: 000231867100009OAI: oai:DiVA.org:kth-78469DiVA: diva2:492541
CAPLUS AN 2005:1022582(Journal). QC 201202282012-02-082012-02-082012-02-28Bibliographically approved