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A1 to L1 _{0} Transformation in FePt Films With Ternary Alloying Additions of Ag and Au

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3 Author(s)
Wang, B. ; Dept. of Mater. Sci. & Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA ; Barmak, K. ; Klemmer, T.J.

The formation of the ordered L10 phase from the parent A1 (face centered cubic, fcc) solid solution phase in ternary FeAgPt (1.5-16.7 at.% Ag) and FeAuPt (1.9-13.8 at.% Au) films has been studied. The films were co-sputter deposited from elemental targets at room temperature and annealed after deposition. The annealed films showed the presence of fcc Ag peaks for concentrations of 6.9 at.% Ag and higher and fcc Au diffraction peaks for concentration of 7.2 at.% Au and higher. Therefore, these two elements are not fully soluble in L10 FePt. The kinetic ordering temperature is higher in both types of ternary films when compared with binary FePt. However, the activation energy for ordering is higher only for high concentrations of Au. The enthalpy for decomposition of FeAgPt and FeAuPt into L10 FePt and Ag or Au is not measurably different than that for transformation of the A1 phase to the L10 phase in binary FePt. Ternary additions of Ag and Au have no impact on the Curie temperature of the L10 phase.

Published in:

Magnetics, IEEE Transactions on  (Volume:46 ,  Issue: 6 )

Date of Publication:

June 2010

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