Browsing by Author "MURPHY, SHANE"
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Asymmetry effects in atomically resolved STM images of Cu (014)-O and W (100)-O surfaces measured with MnNi tips
SHVETS, IGOR; MURPHY, SHANE (2007)We report on scanning tunneling microscopy (STM) studies of the Cu(014)-O and W(100)-O surfaces using MnNi tips. The STM data demonstrate asymmetry effects in atomically resolved images of W(100)-O as well as a regular ... -
Atomic row doubling in the STM images of Cu(014)-O obtained with MnNi tips
SHVETS, IGOR; MURPHY, SHANE (2007)We report on scanning tunneling microscopy studies of the Cu(014)-O surface using MnNi tips. Remarkably, the results show a regular apparent doubling of surface atomic rows in the {110} direction. A qualitative explanation ... -
Atomic scale spin-dependent STM on magnetite using antiferromagnetic STM tips
SHVETS, IGOR; MURPHY, SHANE (2005)STM tips made from antiferromagnetic MnNi have been used to investigate the atomic structure of the (001) and (111) surfaces of Fe3O4. The clean (001) surface displays a (root 2 x root 2)R45 degrees superlattice, which is ... -
Atomically resolved spin-dependent tunneling on the oxygen-terminated Fe3O4(111)
SHVETS, IGOR; MURPHY, SHANE; MARIOTTO, GUIDO (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)
SHVETS, IGOR; MURPHY, SHANE; MARIOTTO, GUIDO (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 ... -
Concept of a nanowire array magnetoresistance device
SHVETS, IGOR; MURPHY, SHANE; ARORA, SUNIL (2008)We describe a concept of the magnetoresistive medium comprising of a planar array of intermingled nanowires with pinned and unpinned magnetic moments. We propose a bottom up method of forming the medium and demonstrate the ... -
Developments in surface magneto-optical Kerr effect setup for ultrahigh vacuum analysis of magnetic ultrathin films
SHVETS, IGOR; USOV, VICTOR; MURPHY, SHANE (2005)We describe a surface magneto-optical Kerr effect (SMOKE) setup designed to study the magnetic properties of ultrathin films in ultrahigh vacuum (UHV). As in earlier systems, a crossed-poles electromagnet is used, which ... -
Epitaxial growth and magnetic properties of Fe nanowedge islands on Mo(110)
SHVETS, IGOR; MURPHY, SHANE; USOV, VICTOR (2005)Fe films with a nominal thickness greater than or equal to 2 Angstrom grown on Mo(1 10) at 500 less than or equal to Tless than or equal to 750 K self-assemble into nanowedge islands supported on a pseudomorphic Fe wetting ... -
Epitaxial growth of ultrathin Cr films on Mo (110) at elevated temperature
SHVETS, IGOR; MURPHY, SHANE (2006)The principal details of Cr film growth on Mo 110 at elevated temperature are described. Cr films form nanostripes by the step-flow growth mechanism for film coverages up to 3 monolayers. In contrast to the Fe/Mo 110 ... -
Formation of the strain-induced electronic superstructure on the magnetite (111) surface
SHVETS, IGOR; MURPHY, SHANE; MARIOTTO, GUIDO (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 ... -
Influence of the antiphase domain distribution on the magnetic structure of magnetite thin films
SHVETS, IGOR; MURPHY, SHANE (American Institute of Physics, 2006)A long-range ordered magnetic domain structure was found in magnetitelike (Fe3??O4, ? ? 0.03) thin films prepared by molecular beam epitaxy on MgO (100) substrates. The stripelike magnetic domain structure arising after ... -
Initial nucleation of Au on the (root2 x root2) R45 circle reconstructed Fe3O4 (001) surface
SHVETS, IGOR; MURPHY, SHANE (2006)The initial nucleation of Au onto the (root 2 x root 2-)R45 degrees reconstructed Fe3O4(001) surface has been studied using scanning tunnelling microscopy. Au clusters are formed, with a typical lateral dimension of similar ... -
Layer-dependent reactivity in the Fe/Mo(110) epitaxial ultrathin film system
SHVETS, IGOR; MURPHY, SHANE; MARIOTTO, GUIDO (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
SHVETS, IGOR; MARIOTTO, GUIDO; MURPHY, SHANE; KANTOR, ROMAN (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. ... -
Microtexture of magnetite thin films of (001) and (111) orientations on MgO substrates studied by electron-backscatter diffraction
MURPHY, SHANE; ARORA, SUNIL KUMAR; SHVETS, IGOR (American Institute of Physics, 2008)The grain orientation of (001)- and (111)-oriented magnetite thin films grown on MgO substrates (film thickness of 100?400?nm) is analyzed by means of the electron-backscatter diffraction (EBSD) technique. The (001) surface ... -
Misorientations in [001] magnetite thin films studied by electron backscatter diffraction and magnetic force microscopy
SHVETS, IGOR; MURPHY, SHANE (AMERICAN INSTITUTE OF PHYSICS, 2007)Magnetite thin films grown on 001 oriented MgO substrates are analyzed by means of electron backscatter diffraction EBSD analysis and magnetic force microscopy in applied fields. The EBSD technique enables the ... -
Morphology and strain-induced defect structure of ultrathin epitaxial Fe films on Mo(110)
SHVETS, IGOR; MARIOTTO, GUIDO; MURPHY, SHANE (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 ... -
Nano-magnetic probing on magnetite (110)
SHVETS, IGOR; MURPHY, SHANE (IEEE Computer Society Press, 2006)We report our results on the structure and magnetic imaging of Fe3O4 (110) thin films using scanning tunneling microscopy/spectroscopy (STM/STS). Based on atomically resolved STM images we present a model for the observed ... -
Oxide template for self-assembling arrays of metal nanoclusters
SHVETS, IGOR; MARIOTTO, GUIDO; MURPHY, SHANE (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 ... -
Oxygen-induced p(3 x 1) reconstruction of the W(100) surface
SHVETS, IGOR; MURPHY, SHANE (2005)The oxidation of the W(100) surface at elevated temperatures has been studied using room temperature STM and LEED. High exposure of the clean surface to O-2 at 1500 K followed by flash-annealing to 2300 K in UHV results ...