The A1-L10 phase transformation has been investigated in (001) FeCuPt thin films prepared by atomic-scale multilayer sputtering and rapid thermal annealing (RTA). Traditional x-ray diffraction is not always applicable in generating a true order parameter, due to non-ideal crystallinity of the A1 phase. Using the first-order reversal curve (FORC) method, the A1 and L10 phases are deconvoluted into two distinct features in the FORC distribution, whose relative intensities change with the RTA temperature. The L10 ordering takes place via a nucleation-and-growth mode. A magnetization-based phase fraction is extracted, providing a quantitative measure of the L10 phase homogeneity.

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forc distribution nucleationandgrowth rta nonideal crystallinity of the a1 multilayer sputtering l10 ordering true order parameter annealing a1 and l10 phases xray diffraction firstorder reversal curve magnetizationbased phase fraction

Kai Liu,Dustin A. Gilbert,Jung-Wei Liao,Liang-Wei Wang,June W. Lau,Timothy J. Klemmer,Jan-Ulrich Thiele,Chih-Huang Lai,.Probing the A1 to L10 transformation in FeCuPt using the first order reversal curve method. 2 (8),.

Kai Liu,Dustin A. Gilbert,Jung-Wei Liao,Liang-Wei Wang,June W. Lau,Timothy J. Klemmer,Jan-Ulrich Thiele,Chih-Huang Lai,"Probing the A1 to L10 transformation in FeCuPt using the first order reversal curve method" 2

Kai Liu,Dustin A. Gilbert,Jung-Wei Liao,Liang-Wei Wang,June W. Lau,Timothy J. Klemmer,Jan-Ulrich Thiele,Chih-Huang Lai,"Probing the A1 to L10 transformation in FeCuPt using the first order reversal curve method"