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Effect of alloy composition on the thermodynamic and kinetic parameters of the to transformation in FePt, FeNiPt, and FeCuPt films
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10.1063/1.2756631
/content/aip/journal/jap/102/2/10.1063/1.2756631
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/2/10.1063/1.2756631

Figures

Image of FIG. 1.
FIG. 1.

The (a) Fe-Ni-Pt and (b) Fe-Cu-Pt ternary phase diagrams (Refs. 18 and 19) The compositions studied are plotted and the stable regions are marked.

Image of FIG. 2.
FIG. 2.

Example baseline-subtracted, nonisothermal DSC scans for plotted comparing the four heating rates used.

Image of FIG. 3.
FIG. 3.

loops comparing the magnetic properties of the disordered (as-dep) and ordered (postanneal) alloy film. As expected, the disordered sample exhibits soft magnetic properties, while the magnetically hard ordered sample has a coercivity of 6.5 kOe.

Image of FIG. 4.
FIG. 4.

Magnetization vs temperature curves for the alloy film marking the Curie temperature of the disordered and ordered phases. The tails are the result of the high field (1.5 T) necessary to saturate the magnetization. The onset of ordering during heating is visible as the slight increase in magnetization of the disordered curve above .

Image of FIG. 5.
FIG. 5.

Curie temperature of the phase as a function of composition for (a) FePt, (b) FeNiPt, and (c) FeCuPt plotted vs Pt concentration. The phase stability limits from the binary phase diagram are given in (a). Lines are drawn to guide the eye.

Image of FIG. 6.
FIG. 6.

phase Curie temperature as a function of composition for FeNiPt plotted vs Fe content.

Image of FIG. 7.
FIG. 7.

Curie temperature of the phase as a function of composition for (a) FePt, (b) FeNiPt, and (c) FeCuPt plotted vs Pt concentration. The phase stability limits from the binary phase diagram are given in (a). Lines are drawn to guide the eye.

Image of FIG. 8.
FIG. 8.

Kinetic ordering temperature as a function of composition for the to transformation in (a) FePt, (b) FeNiPt, and (c) FeCuPt. The phase stability limits from the binary phase diagram are given in (a). Lines are drawn to guide the eye.

Image of FIG. 9.
FIG. 9.

Activation energy for the to transformation plotted as a function of composition in (a) FePt, (b) FeNiPt, and (c) FeCuPt. The phase stability limits from the binary phase diagram are given in (a). Lines are drawn to guide the eye.

Image of FIG. 10.
FIG. 10.

Transformation enthalpy as a function of composition for the to transformation in (a) FePt, (b) FeNiPt, and (c) FeCuPt. The phase stability limits from the binary phase diagram are given in (a). Lines are drawn to guide the eye.

Tables

Generic image for table
Table I.

Lattice parameters measured using XRD of the and phases for each composition for FePt.

Generic image for table
Table II.

Lattice parameters measured using XRD of the and phases for each composition in FeNiPt.

Generic image for table
Table III.

Lattice parameters measured using XRD of the and phases for each composition in FeCuPt. Alloys with Cu content less than were reported previously (see Ref. 10).

Generic image for table
Table IV.

Thermodynamic and kinetic parameters obtained from nonisothermal DSC experiments of FePt, including the kinetic ordering temperature, , measured from scans, the Curie temperatures of the and phases, , the activation energy, , the to transformation enthalpy, , the order parameter, , and the Avrami exponent, .

Generic image for table
Table V.

Thermodynamic and kinetic parameters obtained from nonisothermal DSC experiments of FeNiPt, including the kinetic ordering temperature, , measured from scans, the Curie temperatures of the and phases, , the activation energy, , the to transformation enthalpy, , and the Avrami exponent, .

Generic image for table
Table VI.

Thermodynamic and kinetic parameters obtained from nonisothermal DSC experiments for FeCuPt, including the kinetic ordering temperature, , measured from scans, the Curie temperature of the and phases, , the activation energy, , the to transformation enthalpy, , and the Avrami exponent, . Except for the , alloys with Cu content less than were reported previously (see Ref. 10).

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2007-07-24
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effect of alloy composition on the thermodynamic and kinetic parameters of the A1 to L10 transformation in FePt, FeNiPt, and FeCuPt films
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/2/10.1063/1.2756631
10.1063/1.2756631
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