Paper Title:
Point Defects in L10 Phase FePt Alloy: A First Principle Study
  Abstract

L10 phase FePt alloy is regarded as one of the most promising materials for ultra high density magnetic recording media. However, structural point defects, which would reduce the media's signal to noise ratio, are inevitable in non-stoichiometric L10 FePt alloy. Hence, possible types of point defect (vacancy and anti-site defect) in non-stoichiometric ordered FePt alloy were fully studied using density functional theory. Investigation over vacancy shows the formation energy of Fe and Pt vacancy is respectively 2.58eV and 3.20eV. Geometry relaxation implies Fe vacancy has a stronger deformation force upon the original lattice. Meanwhile, anti-site defect study shows that the formation energy of Fe anti-site (Fe occupation in Pt sublattice) and Pt anti-site (Pt occupation in Fe sublattice) is respectively 1.05eV and 0.66eV. Therefore, for Fe-rich and Pt-rich alloy, the preferred structural point defects are both anti-site substitution rather than vacancy due to the much lower formation energy.

  Info
Periodical
Materials Science Forum (Volumes 561-565)
Main Theme
Edited by
Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages
1923-1926
DOI
10.4028/www.scientific.net/MSF.561-565.1923
Citation
Y. Sui, Z. Y. Chen, X. L. Shu, T. M. Wang, "Point Defects in L10 Phase FePt Alloy: A First Principle Study", Materials Science Forum, Vols. 561-565, pp. 1923-1926, 2007
Online since
October 2007
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$32.00
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