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Dipolar ferromagnetic phase transition in nanoparticle arrays observed by Lorentz microscopy and electron holography
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View: Figures


Image of FIG. 1.
FIG. 1.

Monolayer array of surfactant-coated nanoparticles. (a) Low magnification TEM image near the array film edge. (b) Higher magnification image to see the structural arrangement of nanoparticles. The insets show the FT of regions within a single macrograin. (c) Color map of the macrograin orientations. Different colors are used to indicate the rotation angle . (d) An over-focused FLM image ( defocus) of the same region as Fig. 1(a), showing the magnetic domain walls. The arrows indicate the direction of collectively ordered magnetization. The error in determining the wall positions was . The positions are superimposed on the structural macrograins as dashed lines in Fig. 1(c). Circles indicate where black and white domain walls appear to converge near a structural grain boundary.

Image of FIG. 2.
FIG. 2.

FLM images of domain walls for a region containing both ML and BL arrays, as a function of temperature, (a) , (b) , (c) , (d) , (e) , (f) . The lightest regions indicate a carbon supporting film without nanoparticles. The medium contrast regions are ML, and the darker regions are the BL.

Image of FIG. 3.
FIG. 3.

Temperature dependence of magnetic induction maps determined from the reconstructed phase images of the same region as that shown in Fig. 1(a), (a) , (b) , (c) , (d) , (e) , and (f) .

Image of FIG. 4.
FIG. 4.

Magnetic OP as a function of temperature obtained from EH images in Fig. 3.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dipolar ferromagnetic phase transition in Fe3O4 nanoparticle arrays observed by Lorentz microscopy and electron holography