Synthesis of FePt and FePtCu Nanoparticles by a Reverse Micelle Method and Studies of Magnetic Recording Media Using Them

概要

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Nanoparticulate FePt, which is highly stable under heating, is a very promising magnetic material for future super-high-density magnetic recording media. The FePt and FePtCu nanoparticles were synthesized by a reverse micelle method (H_2O/sodium bis (2-ethylhexyl) sulfosuccinate (AOT) /decane). FePt and FePtCu nanoparticles obtained with this method exhibited monodispersity and homogeneous elemental composition (both coefficients of variation are less than 10%), and the average diameter of these particles was able to arbitrarily controlled between 3 and 9 nm. Further, annealing of the FePtCu nanoparticles in an Ar+H_2 (5%) gas lowered the temperature for modification from fee to fct by way of the oxidation state to the range of 350℃-375℃. Nanoparticulate FePt and FePtCu media coated on glass substrates had a surface roughness (Ra) of less than 1 nm and showed magnetic recording capability.
社団法人日本磁気学会の論文
2004-08-01