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

Spherical granular structures of Ag/Co nanoparticles: Synthesis, characterization and magnetic properties

“…Nevertheless, with the aid of chemical methods, the formation of Ag-Co granular alloys can have three possibilities [13]: (i) core-shell type particles, Ag-core with Co-shell or vice versa [14]; (ii) phase-separated composites, which are made of partly Ag and partly of Co; and (iii) physical mixture of mono-metal particles [15]. A series of nanocrystalline Co x Ag 100−x solid solutions with average particle size of ∼20 nm have been prepared by NaBH 4 reduction of their corresponding metal salts at room temperature in Ar gas flow [16]. Crisan et al [17], prepared different compositions of Ag-Co nanoparticles such as Ag 30 Co 70 and Ag 55 Co 45 through thermal decomposition method, in the presence of oleic acid/tri-dodecylamine as surfactants.…”