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| Format: | Artículo científico |
| Sprache: | en |
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Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C.
1999
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=94200951 |
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Inhaltsangabe:
- Excimer laser treated Ag/Co multilayers exhibiting giant magnetoresistance effect E. Majková . Luby A. Anopchenko M. Spasova V. Holý M. Brunel A. Luches M. Martino M. Jergel Física, Astronomía y Matemáticas An interplay between the structure and giant magnetoresistance (GMR) in laser treated Ag/Co multilayers (MLs) is studied. Three samples with different Ag layer thicknesses, denoted according to nominal values (in nm) as Ag2Co1, Ag4Co1, and Ag6Co1, were exposed to XeCl excimer laser pulses of the fluences (0.1-0.25) Jcm-2 for (1-200) times. The structure was examined by X-ray diffraction, hard X-ray reflectivity, and diffuse scattering measurements at grazing incidence. The polycrystalline face centered cubic structure of Ag layers with random orientation of the grains was found in as-deposited Ag2Co1 and Ag6Co1. The formation of a discontinuous ML by grain boundary diffusion of Ag into Co layers induced by laser treatment is evidenced in Ag6Co1 which explains a systematic increase of the GMR up to the melting threshold for Ag layers. The temperature window for diffusion is too narrow for completing such a process in Ag2Co1. A strong texture of Ag layers found in Ag4Co1 stabilizes the as deposited structure and prevents from a systematical increase of the GMR. When the Ag melting threshold is reached, the ML structure is lost and rapid solidification results into a granular like structure, independent of the structure of the original ML. This structure need not be optimal for achieving a high GMR value 1999 artículo científico 1665-3521 https://www.redalyc.org/articulo.oa?id=94200951 en http://www.redalyc.org/revista.oa?id=942 Superficies y vacío application/pdf Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. Superficies y vacío (México) Num.9