Modified gap states in Fe/MgO/SrTiO3 interfaces studied with scanning tunneling microscopy

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The geometric and electronic structures of Fe islands on MgO film layers were studied with scanning tunneling microscopy and spectroscopy. The MgO layers were grown on a Nb-doped single crystal SrTiO3 (100) surface. Deposited Fe atoms aggregate into islands, the height and diameter of which are about 2.5 and 9.4 nm respectively. Fe islands modify the electronic structure of MgO surface; a ring type depression in the scanning tunneling microscope topography appears by lowered local electron density of states around Fe islands. We find that adsorbed Fe atoms reduce the gap states of MgO layers around Fe islands, which is attributed to the reason for the depletion of the electronic density of states. (C) 2014 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2014-12
Language
English
Article Type
Article
Citation

CURRENT APPLIED PHYSICS, v.14, no.12, pp.1692 - 1695

ISSN
1567-1739
DOI
10.1016/j.cap.2014.09.012
URI
http://hdl.handle.net/10203/280228
Appears in Collection
PH-Journal Papers(저널논문)
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