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Probing the A
1 to L
transformation in FeCuPt using the first order reversal curve method
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25.The coercivity is smaller than FePt due to the Cu introduction, as shown in Ref. 16.
30.The same approach can also be used to extract the reversible portion of the magnetization reversal, by extending the dataset to H<HR, as shown previously in C. Pike, Phys. Rev. B 68, 104424 (2003). For example, for the 300 °C sample which is predominantly the magnetically soft A1 phase, the integrated ρ yields a magnetization within 3% of the measured major loop saturation magnetization.
31.In the extreme case that a residual magentic soft phase is strongly exchange coupled to the hard phase, the FORC feature will be convoluted. Here, even for the 400 °C sample, there is still trace amount of FORC feature near HC = 0, indicating that the A1 phase is magnetically separated from the L10 phase.
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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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