Preparation and magnetic properties of L10–FePt/TiO2 nanocomposite thin films

• Main Authors: Kong, Ji-Zhou, Gao, Mo-Yun, Xia, Yi-Dong, Li, Ai-Dong, Zhang, Jun-Long, Gong, You-Pin, Yan, Qin-Yu, Wu, Di
• Other Authors: School of Materials Science & Engineering
• Format: Article
• Language: English
• Published: 2013
• Online Access: https://hdl.handle.net/10356/96834; http://hdl.handle.net/10220/11686
• Institution: Nanyang Technological University

FePt nanoparticles (NPs) have been encapsulated in the insulating and protective oxide matrix, using a sol–gel process, in order to prevent particles from agglomerating and sintering during the heat-treatment process required for the L10 ordering. The microstructural and ferromagnetic properties of FePt/TiO2 nanocomposites were characterized. The presence of oxide-matrix leads to more homogeneous microstructures and better magnetic properties. The short range positional order of the FePt NPs can be preserved upon annealing at 700 °C to possess higher room-temperature coercivities (HC = 3.7 kOe). Such nanocomposites with assemblies of high-coercivity magnetic nanoparticles are attractive for realizing new types of ultra-high-density data storage devices and magneto-composites.