ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
L10 phase FePt alloy is regarded as one of the most promising materials for ultra highdensity magnetic recording media. However, structural point defects, which would reduce the media'ssignal to noise ratio, are inevitable in non-stoichiometric L10 FePt alloy. Hence, possible types ofpoint defect (vacancy and anti-site defect) in non-stoichiometric ordered FePt alloy were fully studiedusing density functional theory. Investigation over vacancy shows the formation energy of Fe and Ptvacancy is respectively 2.58eV and 3.20eV. Geometry relaxation implies Fe vacancy has a strongerdeformation force upon the original lattice. Meanwhile, anti-site defect study shows that theformation energy of Fe anti-site (Fe occupation in Pt sublattice) and Pt anti-site (Pt occupation in Fesublattice) is respectively 1.05eV and 0.66eV. Therefore, for Fe-rich and Pt-rich alloy, the preferredstructural point defects are both anti-site substitution rather than vacancy due to the much lowerformation energy
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1923.pdf
