HAADF image of the as-prepared multilayer stack.
Pt (---) and Fe (—) concentration across the Fe–Pt multilayer stack (EDXS data) (a) as-prepared and after annealing at (b) and (c) .
Normalized amplitude of the Pt concentration modulation after annealing. The data show averages and standard deviations of the three central layers. Dotted lines mark plateau regions (see text).
High-resolution images, bright-field images, and electron diffraction patterns after annealing at (a) , (b) , and (c) . The diffraction spots are assigned to the different phases as follows: white circles: MgO, dotted circles: Fe, white arrows: Pt, and black arrows: FePt. Arrows above bright-field images denote the position of Pt layers. Figs. 4(a) and 4(c) show also the position of the electron beam stopper.
Equilibrium phase diagram of the Fe–Pt system (after Ref. 16).
Diffusion lengths in the FePt system. Diffusion data were taken from Table I. Diffusion time was chosen according to the experimental annealing times. 1: Fe in Fe, 2: Pt in , 3: Fe in Pt, 4: Pt in , 5: Fe in , 6: Pt in Pt, 7: Pt in Fe, 8: Pt in , and 9: Fe in .
Intermixing model describing the effects of annealing of Fe–Pt multilayers. (a) Initial multilayer structure. (b) After initial intermixing -ordered and form. (c) At a later stage of intermixing -ordered FePt nucleates, most likely near the position of the initial interfaces.
Activation parameters for the diffusion in the FePt system.
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