Browsing by Author "SHVETS, IGOR"
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Raman spectra of p-type transparent semiconducting Cr<inf>2</inf>O<inf>3</inf>:Mg
SHVETS, IGOR; FLEISCHER, KARSTEN; CAFFREY, DAVID; FARRELL, LEO; NORTON, EMMA; MULLARKEY, DARAGH; ARCA, ELISABETTA (2015)Abstract We present an analysis of the Raman spectra of p-type transparent conducting Cr2O3:Mg grown by various techniques including spray pyrolysis, pulsed laser deposition, molecular beam epitaxy and reactive magnetron ... -
Reflectance anisotropy spectroscopy of magnetite (110) surfaces
MAUIT, OZHET; SMITH, CHRISTOPHER; FLEISCHER, KARSTEN; FARRELL, LEO; MCGILP, JOHN; SHVETS, IGOR (2014)Reflectance anisotropy spectroscopy (RAS) has been used to measure the optical anisotropies of bulk and thin-film Fe3O4(110) surfaces. The spectra indicate that small shifts in energy of the optical transitions, ... -
Reflection-mode scanning near-field optical microscopy: Influence of sample type, tip shape, and polarization of light
SHVETS, IGOR (American Institute of Physics, 1998)A reflection-mode aperture-type scanning near-field optical microscope (R-SNOM) based on the external collection of the reflected light is presented. The light detection is based on an elliptical mirror setup, with the tip ... -
Room temperature study of a strain-induced electronic superstructure on a magnetite (111) surface
SHVETS, IGOR; MURPHY, SHANE; MARIOTTO, GUIDO (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 ... -
Room-Temperature Self-Assembly of Equilateral Triangular Clusters via Friedel Oscillations
SHVETS, IGOR (American Physical Society, 2008)We report on the formation of equilateral triangular clusters hollow inside with 5?6 atoms per side, self assembled on Ni adislands grown on Rh(111). The observation of standing wave patterns on the Ni adislands and the ... -
Rotated domain network in graphene on cubic-SiC(001)
MURPHY, BARRY; SHVETS, IGOR; CHAIKA, ALEXANDER (2014) -
Rotational transitions in a C60 monolayer on the WO2/W(110) surface
SHVETS, IGOR; KRASNIKOV, SERGEY; LUBBEN, OLAF; MURPHY, BARRY; WU, HAN-CHUN; BULFIN, BRENDAN (2011)Variable-temperature scanning tunneling microscopy (STM) is shown to be an effective technique to study two-dimensional phase transitions. Observations show that a monolayer of C60 deposited on an ultrathin WO2 layer grown ... -
Scanning tunneling microscopy studies of the Fe3O4(001) surface using antiferromagnetic probes
SHVETS, IGOR; MURPHY, SHANE; MARIOTTO, GUIDO (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 ... -
Scanning tunneling spectroscopy study of the electronic structure of Fe3O4 surfaces
SHVETS, IGOR; MURPHY, SHANE (2006)Scanning tunneling spectroscopy (STS) experiments were performed on the (001) and (111) surfaces of single crystalline magnetite. Room temperature spectra exhibit a ~0.2 eV gap around Ef. The importance of perfect surface ... -
Selecting the tip electron orbital for scanning tunneling microscopy imaging with sub-?ngstrom lateral resolution
SHVETS, IGOR; BOZHKO, SERGEY; KRASNIKOV, SERGEY; LUBBEN, OLAF (Institute of Physics, 2010)We report on scanning tunneling microscopy (STM) studies performed with single crystalline W[001] tips on a graphite(0001) surface. Results of distance-dependent STM experiments with sub-?ngstrom lateral resolution and ... -
Self-assembled alkali and alkaline earth metal nanopatterns on Fe3O4(001)
SHVETS, IGOR; MARIOTTO, GUIDO; MURPHY, SHANE (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-assembled broadband plasmonic nanoparticle arrays for sensing applications
FLEISCHER, KARSTEN; SHVETS, IGOR (2012)Highly ordered noble metal nanoparticle (NP) arrays are produced using a glancing angle deposition on stepped substrates. The versatility of the technique is demonstrated by depositing different metals, resulting in shifts ... -
Self-assembled Fe nanodots on Ge (001)
SHVETS, IGOR (2006) -
Self-assembled Fe nanodots on Ge (001)
SHVETS, IGOR (2006)The initial nucleation of Fe onto the (2x1) reconstructed Ge(001) surface is studied. Uniformly sized two-dimensional Fe dots are shown to nucleate. They have an apparent corrugation height similar to 1.1 A and lateral ... -
Self-Assembly and Ordering of C-60 on the WO2/W(110) Surface
SHVETS, IGOR; MURPHY, BARRY (2011)The growth and ordering of C60 molecules on the WO2/W(110) surface have been studied by low-temperature scanning tunnelling microscopy and spectroscopy (STM and STS), low-energy electron diffraction (LEED) and density ... -
Self-assembly of Fe nanocluster arrays on templated surfaces
LUEBBEN, OLAF; SHVETS, IGOR; MURPHY, BARRY (2012)The growth of Fe nanoclusters on the Ge(001) and MoO2/Mo(110) surfaces has been studied using low-temperature scanning tunneling microscopy (STM) and X-ray magnetic circular dichroism (XMCD). STM results indicate that ... -
Self-assembly of iron nanoclusters on the Fe3O4(111) superstructured surface
SHVETS, IGOR; MARIOTTO, GUIDO; MURPHY, SHANE (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 ... -
Self-limited growth of triangular PtO2 nanoclusters on the Pt(111) surface
SHVETS, IGOR (2010)The high temperature oxidation of the Pt(111) surface by molecular oxygen has been studied using scanning tunnelling microscopy (STM) and low-energy electron diffraction (LEED). Results indicate a self-limited growth of ... -
Spin-dependent transport properties of Fe3O4/MoS2/Fe3O4 junctions.
SHVETS, IGOR; ZHANG, HONGZHOU; DUESBERG, GEORG; GATENSBY, RILEY (2015)Magnetite is a half-metal with a high Curie temperature of 858 K, making it a promising candidate for magnetic tunnel junctions (MTJs). Yet, initial efforts to exploit its half metallic nature in Fe3O4/MgO/Fe3O4 MTJ ...