FePt Nanorods and Nanowires for Novel Ferrofluids
The preparation of a novel ferrofluid out of one-dimensional magnetic structures is attempted by the reverse-micelle-based wet-chemical formation of FePt nanowires and nanorods. The latter were found to manifest lengths ranging from 25 to 250 nm, with an average diameter of only 1.5 to 2 nm. X-ray diffraction and high-resolution TEM revealed a polycrystalline microstructure, with individual grains having the disordered fcc structure in the as-prepared state; a thermally induced transition to the chemically ordered phase was observed around 550°C. The samples were determined to be superparamagnetic at room temperature, with the blocking temperature measured to be ~26 K.
Marcin Leonowicz and Dariusz Oleszak
Z. Y. Wu et al., "FePt Nanorods and Nanowires for Novel Ferrofluids", Solid State Phenomena, Vol. 154, pp. 89-94, 2009