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Size Effect Study of the L10 Phase Transformation in FePt Nanoparticles

Published online by Cambridge University Press:  01 February 2011

Yi Ding  and
Sara A. Majetich
Yi Ding
Affiliation:
Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213-3890, U.S.A.
Sara A. Majetich
Affiliation:
Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213-3890, U.S.A.
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Abstract

The relation between particle size and anisotropy in the fcc to L10 phase transformation in FePt nanoparticles is described. After annealing to partially sinter the particles, the volume distribution was found by transmission electron microscopy, and related to the magnetic switching field distribution. With the assumption that larger particles have higher switching fields, we find a consistent size threshold, d*, of about 12 nm for high anisotropy, independent of the annealing conditions. Our analysis shows that the phase transformation is limited by the lack of nucleation sites in small particles rather than by the chemical inhomogeneity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 877: Symposium S – Magnetic Nanoparticles and Nanowires , 2005 , S4.5
Copyright
Copyright © Materials Research Society 2005

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