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Positive surface and perpendicular magnetic anisotropy in natural nanomorphous Ni/NiO multilayers
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
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2010 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 96, no 20, 202503- p.Article in journal (Refereed) Published
Abstract [en]

Ni/NiO multilayers with excellent sequencing are grown via radiofrequency magnetron sputtering with the use of one Ni target and natural oxidation. Ni layers consist of very small Ni nanocrystals interrupted by amorphous NiO layers. When Ni is deposited at 0.3 Pa Ar-pressure, the hard-magnetization axis is the film normal and saturation field decreases by decreasing Ni layer thickness. Considerable positive surface anisotropy is found, which is remarkable for Ni-based multilayers. If Ni is deposited at 3 Pa Ar-pressure, perpendicular magnetic anisotropy is observed at low temperatures even for 5.4 nm thick Ni layers. This anisotropy results in the formation of stripe magnetic domains.

Place, publisher, year, edition, pages
2010. Vol. 96, no 20, 202503- p.
Keyword [en]
amorphous magnetic materials, magnetic anisotropy, magnetic domains, magnetic multilayers, nanostructured materials, nickel, nickel compounds, oxidation, sputter deposition
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-136425DOI: 10.1063/1.3428791ISI: 000277969700033OAI: oai:DiVA.org:uu-136425DiVA: diva2:376907
Available from: 2010-12-13 Created: 2010-12-13 Last updated: 2017-12-11Bibliographically approved

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Kapaklis, VassiliosJönsson, Petra E.Papaioannou, Evangelos Th.

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