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Tunneling spectroscopy in core/shell structured Fe/MgO nanospheres
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) TEM image of the interface viewed along the [111] MgO zone axis with partial wedge disclinations of {110} Fe planes. Scale bar is 2 nm. (b) Scanning electron microscope image of a device and measuring scheme. Pt wires are connected to Au source and drain contacts to measure the current circulating through the core-shell Fe/MgO nanoparticle. Inset: electron microscopy image showing the core/shell structure of the nanoparticles.

Image of FIG. 2.
FIG. 2.

(a) characteristic curves. The curve corresponds to different runs carried out at 295 K. (b) Conductance as a function of the voltage. Arrows indicate band-offsets corresponding to different tunneling peaks. (c) The natural logarithm of the resistance plotted as a function of temperature for a cold-pressed film with an isotropic granular structure consisting of 150 nm Fe particles and intergranular crystalline MgO. The solid line corresponds to the expected linear variation with .

Image of FIG. 3.
FIG. 3.

(a) Spectrum of the differential conductance estimated by subtracting the parabolic background curve. The solid color line depicts the experimental values. The corresponding theoretical curves from majority (open dots) and minority states (black squares) of Fe-bcc are shown amid the measured spectra.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tunneling spectroscopy in core/shell structured Fe/MgO nanospheres