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Monodisperse face-centred tetragonal FePt nanoparticles with giant coercivity

Kevin Elkins, Daren Li, Narayan Poudyal, Vikas Nandwana, Zhiqiang Jin, Kanghua Chen and J Ping Liu

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Monodisperse face-centred tetragonal (fct) FePt nanoparticles with high magnetic anisotropy and, therefore, high coercivity have been prepared via a new heat treatment route. The as-synthesized face-centred cubic FePt nanoparticles were mixed with salt powders and annealed at 700°C. The salts were then removed from the particles by washing the samples in water. Monodisperse fct FePt particles were recovered with the particle size and shape being retained. Coercivity of the isolated particles up to 30 kOe at room temperature has been obtained.


PACS

75.50.Tt Fine-particle systems; nanocrystalline materials

75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization

75.30.Gw Magnetic anisotropy

75.50.Vv High coercivity materials

Subjects

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Nanoscale science and low-D systems

Dates

Issue 14 (21 July 2005)

Received 15 April 2005, in final form 15 May 2005

Published 1 July 2005



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