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Calorimetric studies of the to transformation in binary FePt thin films with compositions in the range of Fe
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Image of FIG. 1.
FIG. 1.

Base-line-subtracted calorimetric traces at a heating rate of for two FePt films showing the shift to lower temperature with increasing Fe content. The Curie temperature of the ordered phase is measured from the downward change in the slope of the base-line during a second heating run. The upward change observed here is a result of the base-line subtraction procedure. The change in the slope of the trace preceding the exothermic transformation peak likely represents the Curie transition of the phase.

Image of FIG. 2.
FIG. 2.

X-ray diffraction scans for the alloy film (a) as-deposited and heated at to (b) 300 and (c) . The annealed sample shows the superlattice peaks (001), (110), and (201) for the phase, thereby confirming that the exothermic peak in Fig. 1 is the to transformation.

Image of FIG. 3.
FIG. 3.

Bright-field transmission electron micrographs and selected area diffraction patterns (insets) for [(a), (c)] and [(b), (d)] films heated at [(a), (b)] and [(c),(d)]. For some annealed samples, the selected area diffraction patterns showed the presence of magnetite as a very fine-grained minor phase. This phase is believed to have formed on the sample surface during annealing.

Image of FIG. 4.
FIG. 4.

Curie temperature as a function of Fe concentration for the alloy films studied here and for the bulk alloys reported previously (see Refs. 86–89).

Image of FIG. 5.
FIG. 5.

(a) Transformation enthalpy, , (b) activation energy, , and (c) kinetic ordering temperature, , as a function of Fe content in the films.


Generic image for table
Table I.

Film compositions measured by energy dispersive x-ray fluorescence (EDXRF) and Rutherford backscattering spectrometry (RBS), the Curie temperature of the phase, , the kinetic ordering temperature, , the to transformation activation energy, , enthalpy, , and the Avrami exponent, , determined by two different methods. The number in parentheses represents the number of measurements for each parameter.

Generic image for table
Table II.

Lattice parameters for as-deposited and annealed films.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Calorimetric studies of the A1 to L10 transformation in binary FePt thin films with compositions in the range of 47.5–54.4at.% Fe