| 초록 |
Ordered assembly of FePt nanocrystals is of great importance for magnetic data storage media. Tetragonal (fct) structured FePt is known to have large uniaxial magnetocrystalline anisotropy and high coercivity. Chemical routes were frequently employed to synthesize monodisperse FePt nanocrystals. The chemically synthesized FePt nanocrystals have to be heat-treated to 550 oC or more to obtain fct phase FePt. However, the surfactants coating the particles are decomposed at these temperatures, leading to agglomeration of monodisperse nanoparticles. Herein, we report on simple ‘one-pot’ synthetic method of size controlled L10 phase FePt nanoparticles. Synthesis was achieved by the assembly of PI-b-PEO block copolymers with aluminosilicate sols, Fe and Pt organometals. The as-synthesized material was heat treated to 800 °C.The XRD, TEM and SQUID investigations were performed to characterize the properties of fct FePt nanocrystals encapsulated in ordered cellular mesopores. |
