Browsing by Author "MARIOTTO, GUIDO"
Now showing items 1-13 of 13
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Atomically resolved spin-dependent tunneling on the oxygen-terminated Fe3O4(111)
(2004)We employ spin-polarized STM to study the spin-dependent tunneling between a magnetite (111) sample and an antiferromagnetic tip through a vacuum barrier at room temperature. Atomic scale STM images show significant ... -
Charge ordering on the surface of Fe3O4(001)
(2002)We have studied the (001) surface of a Fe3O4 single crystal using scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and Auger electron spectroscopy. A clean surface was obtained by a combination ... -
Dynamic behavior of a piezowalker, inertial and frictional configurations
(American Institute of Physics, 1999)We have examined two configurations of a piezowalker, the inertial and the frictional one, both of which are capable of moving samples with submicrometer steps over a distance of some millimeters. We demonstrated that, ... -
Formation of the strain-induced electronic superstructure on the magnetite (111) surface
(2003)We present direct experimental evidence of the formation of a superstructure on the (111) surface of a magnetite, Fe3O4 single crystal. The superstructure, which has a periodicity of 42A and three-fold symmetry, has been ... -
Layer-dependent reactivity in the Fe/Mo(110) epitaxial ultrathin film system
(2003)Fe films in the 0.4<~?<~4.7ML (monolayer) coverage range were deposited on a Mo(110) substrate at temperatures between 300 K and 700 K, under ultrahigh vacuum conditions. The adsorption of CO, CO2, H2O, and O2 onto these ... -
Long-range charge order on the Fe3O4(001) surface
(American Physical Society, 2004)The Verwey transition in magnetite is of fundamental importance for the understanding of metal-insulator transitions but, in spite of being the subject of many studies over the last century, its nature is not fully understood. ... -
Morphology and strain-induced defect structure of ultrathin epitaxial Fe films on Mo(110)
(2002)Fe films in a coverage range of 0.4<~?<~4.7ML were deposited on a Mo(110) substrate in the 300<~T<~700K temperature range. It is found that growth around 300 K is mediated by the step-flow growth mechanism, in contrast ... -
Oxide template for self-assembling arrays of metal nanoclusters
(2006)We demonstrate that ordered arrays of metal clusters of a few nanometers in size can be fabricated by self-assembly on a range of oxide nanotemplates. Two systems were chosen, FeO/Pt(111) and Fe3O4, having in common a ... -
Room temperature study of a strain-induced electronic superstructure on a magnetite (111) surface
(2004)A magnetite sFe3O4d single-crystal (111) surface has been studied at various oxygen-iron surface stoichiometries. The stoichiometry was modified by controlling the in situ sample anneal conditions. We have found the ... -
Scanning tunneling microscopy studies of the Fe3O4(001) surface using antiferromagnetic probes
(2003)We have studied the (001) surface of a Fe3O4 single crystal using low-energy electron diffraction (LEED), Auger electron spectroscopy (AES) and scanning tunneling microscopy (STM). The STM measurements were performed using ... -
Self-assembled alkali and alkaline earth metal nanopatterns on Fe3O4(001)
(2004)We have studied the mechanism of nanopattern formation by self-assembly of impurities aggregated on the Fe3O4(001) surface. Self-assembly was controlled by thermal diffusion from the bulk of natural and artificial single ... -
Self-assembly of iron nanoclusters on the Fe3O4(111) superstructured surface
(2005)We report on the self-organized growth of a regular array of Fe nanoclusters on a nanopatterned magnetite surface. Under oxidizing preparation conditions, the s111d surface of magnetite exhibits a regular superstructure with ... -
Spin-polarized tunneling effects observed on the oxygen-terminated Fe3O4 (111) surface
(2004)Under oxidizing preparation conditions the magnetite (111) surface reconstructs to a highly ordered superlattice. This surface reconstruction represents an oxygen termination of the magnetite bulk. We employ spin-polarized ...
