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Electron holography of core-shell spherical nanocrystals
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View: Figures


Image of FIG. 1.
FIG. 1.

High-resolution TEM image (a) indicates the core-shell microstructure, in which the nanocrystal observed is arrowed in (b). TEM image (b) shows nanocrystal chains self-assembled by magnetic dipolar interaction. It is found that the core of is about in diameter and the oxygen-rich shell is about in thickness.

Image of FIG. 2.
FIG. 2.

(Color online) Reconstructed phase image of the electron holography carried out at room temperature at an accelerating voltage of with a JEM 3000F field-emission-gun TEM, which is equipped with a special pole piece to shield the sample from the field of the objective lens. A positive voltage of is applied to an electrostatic biprism wire. The arrowed nanocrystal is analyzed in Fig. 3.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Reconstructed phase image of the nanocrystal arrowed in Fig. 2. Profiles of the total phase shift (b), the contribution of the mean inner potential (c), and the contribution of the magnetic induction (d) are plotted against position along cross the nanocrystal, as shown in (a). is recorded at two remanence states which are saturated along the left-to-right and right-to-left directions, respectively. It is found that the diameter of the cobalt core and the thickness of the CoO shell are 11.2 and . The mean inner potential of Co core is estimated at , while that of CoO shell is about . The red solid curve in is the theoretical fit curve.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electron holography of core-shell Co∕CoO spherical nanocrystals