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Electromigration induced fast L10 ordering phase transition in perpendicular FePt films
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic setup of the electrical current control LOPT of FePt/Au multilayer films, the output of power supply is 30 V and the current density in the experiments ranges between 2–5 × 105 A/cm2.

Image of FIG. 2.
FIG. 2.

(a)-(e) In-plane (red color) and out-of-plane (black color) hysteresis loops of FePt/Au multilayer films after applying an electrical current for different amount of time (t): (a) 20 s; (b) 45 s; (c) 60 s; (d)90 s. (f) Dependence of perpendicular coercivity (H C ) on t.

Image of FIG. 3.
FIG. 3.

(a) XRD spectra of the electrical controlled FePt/Au multilayer films with different electrical current treatment time t, the curves were offset vertically for clarity. (b) and (c) Variations of ordering degree (S) and electrical resistance (R) with t.

Image of FIG. 4.
FIG. 4.

Cross sectional HRTEM images of the FePt/Au multilayer film after applying current for 45 s with observation along the [100] zone axis of the MgO substrate. (a) Morphology image. (b) Elemental distributions at different scanning depth away from the surface (d), which were obtained from line scanning EDXS. Scanning track was marked in the Fig. 4(a) . (c)Local high resolution image, typical lattice defects were marked with circles. (d) Selected area electron diffraction pattern.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electromigration induced fast L10 ordering phase transition in perpendicular FePt films