XRD spectrum of the CVD products. The symbols of “◻,” “엯,” “⋆,” and “●” represent the presence of , , , and carbon nanotubes, respectively.
(a) Bright-field TEM image of an Fe-filled multiwall carbon nanotube and (b) EDS spectrum taken from the Fe core.
(a) HREM image of an -filled multiwall carbon nanotube; (b) the magnified view of the Fe core and carbon nanotube from the marked region in (a); (c) fast Fourier transform pattern taken from the image shown in (a).
(Color online) (a) Electron hologram of an nanorod encapsulated in a carbon nanotube and [(b) and (c)] mean inner potential and magnetic component retrieved from the measured phase shift.
(Color online) (a) Illustration of an elliptical cross section of a carbon nanotube containing an nanorod with arbitrary shape and (b) retrieved thickness image of the nanorod using a 3D morphological model described by Eq. (3).
(Color online) (a) Schematic model for phase calculations. The nanorod is divided into a large number of small magnetic particles with a single magnetic domain; (b) calculated phase distribution of based on the thickness image of Fig. 5(b); [(c) and (d)] three-dimensional images of the calculated and experimental phase distributions of , respectively; and (e) phase profiles across the nanorod from to shown in (c) and (d).
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