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Título : Correlation between Mn oxidation state and magnetic behavior in Mn/ZnO multilayers prepared by sputtering
Autor : Céspedes, E., García López, J., García-Hernández, M., Andrés, Alicia de, Prieto, C.
Palabras clave : Curie temperature
Ferromagnetic materials
Magnetic multilayers
Metallic thin films
X-ray absorption spectra
X-ray reflection
Zinc compounds
Fecha de publicación : 3-Aug-2007
Editor: American Institute of Physics
Resumen: 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+.
Descripción : 5 páginas, 5 figuras, 1 tabla.
Versión del editor:
ISSN: 0021-8979
DOI: 10.1063/1.2764207
Citación : Journal of Applied Physics 102(3): 033907 (2007)
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