Tunneling spectroscopy in core/shell structured Fe/MgO nanospheres

Martínez-Boubeta, C.; Balcells, Ll.; Monty, C.; Ordejon, P.; Martínez, B.
February 2009
Applied Physics Letters;2/9/2009, Vol. 94 Issue 6, pN.PAG
Academic Journal
We report on tunneling conductance properties of a single Fe island enclosed by an epitaxial MgO shell. The results obtained show clear oscillations in the current-voltage curves that, along with the theoretical modeling, allow determining the electronic density of states of the iron core. Moreover, the correlation of these results with the temperature dependence of the electrical conductivity of assemblies of Fe/MgO nanocrystals provides evidence of the Δ1 symmetry-sensitive tunneling across a crystalline magnesia barrier.


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