Magnetoresistance and annealing behaviors of particulate Co-Au nanocomposites
Cocore Aushell nanoparticles, stabilized with a sulfobetaine surfactant, were fabricated from a displacement reaction of Au3+ with Co nanoparticles and compressed into a granular composite. The affect of annealing the composite in a hydrogen environment was investigated and found to have a dramatic effect on the magnetic properties, size, and composition of the CoAu nanoparticles. A negative magnetoresistance was observed and exhibited a parabolic functionality with annealing temperature, increasing and then decreasing with annealing temperature. A similar behavior was observed for the coercivity, attributed to the increase in particle size with the annealing temperature. The surfactant was decomposed with annealing. © 2007 The Electrochemical Society.
Publication Source (Journal or Book title)
Electrochemical and Solid-State Letters
Guo, Z., Moldovan, M., Young, D., Henry, L., & Podlaha, E. (2007). Magnetoresistance and annealing behaviors of particulate Co-Au nanocomposites. Electrochemical and Solid-State Letters, 10 (12) https://doi.org/10.1149/1.2794685