Hard Magnetic FePt Nanoparticles by Adsorption-Annealing and Orientation Control

概要

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Chemically synthesized FePt nanoparticles are attractive material for magnetic recording media, because of the small size and narrow size distribution. Here we report the fabrication of hard magnetic fct-FePt nanoparticles from chemically synthesized superparamagnetic FePt nanoparticles by annealing following their adsorption onto a zeolite surface. This process enabled the preparation of colloidal fct-FePt nanoparticles with average size of 5.1 nm and size distribution of 8%, respectively. The thus obtained fct-FePt nanoparticles can be oriented using baking in a magnetic field; the resultant coercivities at 300 K are 3.09 kOe and 9.86 kOe in the parallel and perpendicular directions respectively.
2007-12-25