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Structural phase transition and ferromagnetism in monodisperse 3 nm FePt particles

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Structural phase transition and ferromagnetism in monodisperse 3 nm FePt particles

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Title: Structural phase transition and ferromagnetism in monodisperse 3 nm FePt particles
Author: Rong, Chuanbing; Poudyal, Narayan; Chaubey, Girija Shankar; Nandwana, Vikas; Skomski, R.; Wu, Y.Q.; Kramer, Matthew J.; Liu, J. Ping
Abstract: FePt nanoparticles with a size of 3 nm and thermally stable room-temperature ferromagnetism are investigated. The monodisperse nanoparticles were prepared by chemical synthesis and a salt-matrix annealing technique. Structural and magnetic characterizations confirmed the phase transition from the disordered face-centered cubic structure to the L10 structure with the chemical ordering parameter of 0.62±0.05. Analysis in blocking temperature and fitting of temperature dependence of switching field reveals that the transformed 3 nm nanoparticles have a magnetic anisotropy constant of (2.8±0.2)×106 J/m3, smaller than those for the bigger particles and the fully ordered L10 bulk phase.
URI: http://hdl.handle.net/10106/4987
Date: 2007-08-30
External Link: http://link.aip.org/link/JAPIAU/v102/i4/p043913/s1

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