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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.
(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.
(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.
Cross sectional HRTEM images of the FePt/Au multilayer film after applying current for 45 s with observation along the  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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