|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Advanced Magnetic Materials: An FMD Symposium in Honor of Michael E. McHenry
||Magnetic Properties of Size-controlled Ni Nanoparticles Modified with Tri-n-octylphosphine
||Kenichi Yatsugi, Toshitaka Ishizaki, Kunio Akedo
|On-Site Speaker (Planned)
We have studied the size dependence of magnetic properties of Ni nanoparticles, because magnetic nanoparticles are promising materials for low-loss magnetic cores when their size decreases to a few tens of nanometers. Ni nanoparticles were synthesized via reduction of Ni(II) acetylacetonate with oleylamine using tri-n-octylphosphine (TOP) as the stabilizer. The size of Ni nanoparticles, characterized by transmission electron microscopy, was reduced from 62 to 16 nm with increasing an amount of TOP. The magnetic properties of Ni nanoparticles were measured by a vibrating sample magnetometer. The coercivity and saturation magnetization decreased as the particle size decreased. The decrease of coercivity can be attributed to superparamagnetism because the size of the nanoparticles is enough small to exhibit superparamagnetism, and the decline of saturation magnetization can be attributed to surface oxidation and phosphide impurities, which were characterized by X-ray photoelectron spectroscopy.
||Planned: None Selected