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(a) In situ AFM image of FePt alloy dots grown on cleaved NaCl(001) surface with a nominal thickness of 1.3 ML at substrate temperature of 585 K, the scan area is . The line profile at the bottom of the image shows the uniformity of the height and width of the dots. (b) and (c) are the height and lateral diameter distributions (length and breadth) of the alloy dots. The height distribution was from the AFM data, while the lateral size distributions were from the TEM measurements. The dashed lines are the corresponding Gaussian fits of the distributions.
TEM micrographs of the FePt dots assembly in Fig. 1 after it was transferred to a carbon thin film. (a) Typical image of the dots assembly, which is similar to the AFM images in the sense of the density and lateral size after deconvolution. Note that the rectangular dots are all aligned up along the crystalline orientation of NaCl (001); (b) HRTEM image of a single dot revealed the (200) lattice fringes, the distance between the white lines is 0.193 nm, i.e., the lattice constant is 0.39 nm; the micro-electron diffraction patterns from a group of dots as (a) (see the text) and single dots as (b) are shown as insets in (a) and (b), respectively. (c) EDS spectra of experimental and simulated patterns of the alloy nanodots. The simulation were carried out by assuming Fe:Pt ratio as 4:21.
In situ AFM images of spatially ordered FePt alloy dots grown on stepped NaCl(001) surface with nominal thickness of 1.3 ML at substrate temperature of 585 K. Scan area . The inset picture is a close-up of the dots chains, .
Zero field cool (circles) and field cool (square) temperature dependence of the magnetization of the NaCl(001) supported alloy dots. The curves are measured at the field of 50 Oe. The inset is a typical hysterisis acquired at 30 K by SQUID magnetometer.
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