Artículo
Correlation between Mn oxidation state and magnetic behavior in Mn/ZnO multilayers prepared by sputtering
Autor/es | Céspedes, E.
García López, Francisco Javier García Hernández, M. Andrés, A. de Prieto, C. |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2007 |
Fecha de depósito | 2019-10-25 |
Publicado en |
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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, ... 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 x15 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+. |
Identificador del proyecto | MAT2003-01880
MAT2006-01004 |
Cita | Céspedes, E., García López, F.J., García Hernández, M., Andrés, A.d. y Prieto, C. (2007). Correlation between Mn oxidation state and magnetic behavior in Mn/ZnO multilayers prepared by sputtering. Journal of Applied Physics, 102 (3), 033907. |
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