Magneto-resistance above 300 K in nano-crystalline Co–Ag metastable solid solutions

A series of nano-crystalline Co x Ag 100− x solid solutions have been prepared by NaBH 4 reduction of the corresponding metal salts at room temperature in Ar gas flow. Alloys heat-treated at 600 °C in Ar/H 2 (5%) show the evolution of metastable fcc Co precipitates in Ag. Magnetic studies indicate t...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2008-10, Vol.320 (19), p.2397-2401
Main Authors: Chandra, Vimlesh, Srivastava, Rishi, Sundar Manoharan, S.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Co–Ag alloy
Cross-disciplinary physics: materials science
rheology
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in multilayers, nanoscale materials and structures
Electron–phonon
Exact sciences and technology
Granular alloy
Magnetic properties and materials
Magnetic properties of nanostructures
Magneto-resistance
Materials science
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Physics
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Summary:A series of nano-crystalline Co x Ag 100− x solid solutions have been prepared by NaBH 4 reduction of the corresponding metal salts at room temperature in Ar gas flow. Alloys heat-treated at 600 °C in Ar/H 2 (5%) show the evolution of metastable fcc Co precipitates in Ag. Magnetic studies indicate that all the compositions are ferromagnetic with Curie temperatures >400 K. For a nominal composition of Co 60Ag 40, heat-treated at 600 °C, an effective negative magneto-resistance (MR) ratio of the order of ∼21% at 350 K, at 2 T is observed. This could arise from the influence of magnetic field on the electron–phonon scattering effects near to T c and to the spin-mixing scattering by magnons.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2008.05.010