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Open Access item Correlation between Mn oxidation state and magnetic behavior in Mn/ZnO multilayers prepared by sputtering

Authors:Céspedes, E.
García López, J.
García-Hernández, M.
Andrés, Alicia de
Prieto, C.
Keywords:Curie temperature, Ferromagnetic materials, Semiconductors, Magnetic multilayers, Manganecese, Metallic thin films, X-ray absorption spectra, X-ray reflection, Zinc compounds
Issue Date:3-Aug-2007
Publisher:American Institute of Physics
Citation:Journal of Applied Physics 102(3): 033907 (2007)
Abstract:Compositional, microstructural, and magnetic characterization of [ZnO(30 Å)/Mn(x)]n multilayers prepared by sputtering is presented to study the observed ferromagnetism in the Mn-ZnO system. The nominal Mn layer thickness, x, is varied from 3 to 60 Å, while the number of bilayers, n, is increased to maintain the total amount of Mn constant. Microstructure information was deduced from x-ray reflectivity, Mn oxidation state was determined by x-ray absorption spectroscopy, and magnetic properties were measured over a temperature range of 5–400 K. Magnetic behavior of these samples is found to be related to the Mn layer thickness (x). Multilayers with x ≥ 30 Å exhibit ferromagnetism with a Curie temperature above 400 K, while mostly paramagnetic behavior is obtained for x<15 Å. Magnetic behavior is discussed in terms of electronic and structural parameters of samples. Mn-ZnO interface effect is related to the ferromagnetic order of the samples, but it is not a sufficient condition. The essential role of the Mn oxidation state in the magnetic behavior of this system is pointed out. It is shown a correlation between the obtained ferromagnetism and a Mn oxidation state close to 2+.
Description:5 páginas, 5 figuras, 1 tabla.
Publisher version (URL):http://dx.doi.org/10.1063/1.2764207
E-ISSNmetadata.dc.identifier.doi = DOI:1089-7550
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