Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/22083
Title: From demagnetizing to magnetizing interactions in CoFe-AgCu granular films
Author: Puntes, Víctor
Batlle Gelabert, Xavier
Labarta, Amílcar
Watson, M. L.
O'Grady, K.
Keywords: Ferromagnetisme
Propietats magnètiques
Pel·lícules fines
Ciència dels materials
Microestructura
Magnetic properties
Thin films
Materials science
Microstructure
Issue Date: 1997
Publisher: American Institute of Physics
Abstract: CoFe-AgCu granular films of compositions ranging from 0.17-0.44 ferromagnetic atomic concentration were prepared by rf sputtering. The microstructure and the transport and magnetic properties suggested that this family of samples can be classified into two groups with a crossover concentration at about 32 at. %. The experimental results for samples Co34Fe8Ag54Cu4 and Co18Fe8Ag70Cu4, which are representative of both different behaviors, are discussed. For the as-prepared sample with higher CoFe content, an uncompensated out-of-plane antiferromagneticlike microstructure with dominant demagnetizing interactions was observed. The particle growth through the annealing led to large in-plane ferromagneticlike clusters with dominant magnetizing interactions. The thermal dependence of the remanence-to-saturation ratio of the as-prepared and annealed samples indicated the existence of a high degree of magnetic correlations leading to a very low magnetoresistivity: In none of the cases was a Stoner¿Wohlfarth behavior observed. On the contrary, for the sample with lower CoFe content, the magnetoresistivity change was much higher, and the remanence followed the expected behavior, since magnetic correlations were strongly reduced through dilution.
Note: Reproducció del document publicat a: http://dx.doi.org/10.1063/1.365173
It is part of: Journal of Applied Physics, 1997, vol. 81, núm. 8, p. 4593-4595
URI: http://hdl.handle.net/2445/22083
ISSN: 0021-8979
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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