Magnetoresistance and annealing behaviors of particulate Co-Au nanocomposites

作者：Guo Zhanhu^*; Moldovan Monica; Young David P; Henry Laurence L; Podlaha Elizabeth J

来源：Electrochemical and Solid-State Letters, 2007, 10(12): E31-E35.

DOI：10.1149/1.2794685

CocoreAushell 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.

• 出版日期2007
• 单位东北大学