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Transmission electron microscopy study of the intermixing of Fe–Pt multilayers
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Image of FIG. 1.
FIG. 1.

HAADF image of the as-prepared multilayer stack.

Image of FIG. 2.
FIG. 2.

Pt (---) and Fe (—) concentration across the Fe–Pt multilayer stack (EDXS data) (a) as-prepared and after annealing at (b) and (c) .

Image of FIG. 3.
FIG. 3.

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).

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

Equilibrium phase diagram of the Fe–Pt system (after Ref. 16).

Image of FIG. 6.
FIG. 6.

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 .

Image of FIG. 7.
FIG. 7.

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.


Generic image for table
Table I.

Activation parameters for the diffusion in the FePt system.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Transmission electron microscopy study of the intermixing of Fe–Pt multilayers