Browsing Physics (Scholarly Publications) by Sponsor "Science Foundation Ireland (SFI)"
Now showing items 21-40 of 604
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Anomalous magnetization reversal due to proximity effect of antiphase boundaries
(2011)Here we report anomalous double switching hysteresis loop and high coercivity (~0.1 T) in Fe3O4(110) thin films. Our analytical model based on spin chains confined within small antiphase boundary domains (APBDs) suggests ... -
Anomalous strain relaxation behaviour of Fe3O4/MgO (100) heteroepitaxial system grown using molecular beam epitaxy
(2006)Strain relaxation studies in epitaxial magnetite (Fe3O4) thin films grown on MgO (100) substrates using high-resolution x-ray diffraction and cross-sectional transmission electron microscopy reveal that the films remain ... -
Antiband instability on vicinal Si(111) under the condition of diffusion-limited sublimation
(2012)In this paper, we investigate the antiband instability on vicinal Si(111) surfaces with different angles of misorientation. It is known that prolonged direct current-annealing of Si(111) results in the formation of antibands; ... -
Antiferromagnetic interlayer exchange coupling between Fe3O4 layers across a nonmagnetic MgO dielectric layer
(2008)We have investigated the interlayer exchange coupling between the epitaxial spinel Fe3O4 layers across an insulating nonmagnetic MgO spacer. The epitaxial structure used for these investigations was Fe3O4 (10?nm)/MgO ... -
Application of single crystalline tungsten for fabrication of high resolution STM probes with controlled structure
(2011)The possibility to fabricate scanning tunneling microscopy (STM) probes with controlled electronic structure using single crystalline tungsten tips is discussed. High resolution power of oriented single crystalline probes ... -
Applications and extensions of the Z-cone model for the energy of a foam
(2015)We present an extended analysis of the Z -cone model for the estimation of the energy of an ordered foam. In particular, we show that it results in an interaction potential with an expone ... -
Assessment of the accuracy of an ultrasound elastography liver scanning system using a PVA-cryogel phantom with optimal acoustic and mechanical properties
(2010)The accuracy of a transient elastography liver-scanning ultrasound system was assessed using a novel application of PVA-cryogel as a tissue-mimicking material with acoustic and shear elasticity properties optimized to ... -
Asymmetry effects in atomically resolved STM images of Cu (014)-O and W (100)-O surfaces measured with MnNi tips
(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
(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
(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)
(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 ... -
Au4Mn: A localized ferromagnet with strong spin-orbit coupling, long-rangeferromagnetic exchange, and high Curie temperature
(2022)Metallic Mn-based alloys with a nearest-neighbor Mn-Mn distance greater than 0.4 nm exhibit large, well-localized magnetic moments. Here we investigate the magnetism of tetragonal Au 4 Mn with a Curie temperature of ... -
Bacterially synthesized tellurium nanostructures for broadband ultrafast nonlinear optical applications
(2019)Elementary tellurium is currently of great interest as an element with potential promise in nano-technology applications because of the recent discovery regarding its three two-dimensional phases and the existence of Weyl ... -
Bi-substitution-induced magnetic moment distribution in spinel BixCo2-xMnO4 multiferroic
(2009)We report the near-edge x-ray absorption spectroscopy (NEXAFS) at the Co/Mn L3,2 edge and oxygen K edge of the well-characterized Bi-substituted Co2MnO4 multiferroic samples. The evolution of peak features in NEXAFS spectra ... -
Bias asymmetry in the conductance profile of magnetic ions on surfaces probed by scanning tunneling microscopy
(2012)PHYSICAL REVIEW B 86 , 125411 (2012) Bias asymmetry in the conductance profile of magnetic ions on surfaces probed by scanning tunneling microscopy Aaron Hurley, Nadjib Baadji, and Stefano Sanvito School of Physics ... -
Bias-dependent oscillatory electron transport of monatomic sulfur chains
(2012)The bias-dependent oscillatory electron transport of monatomic sulfur chains sandwiched between gold electrodes is investigated with density functional theory and non-equilibrium Green's function method. At zero bias, in ... -
Boron diffusion in magnetic tunnel junctions with MgO (001) barriers and CoFeB electrodes
(2010)Boron diffusion out of the CoFeB layers in model systems with thick CoFeB and MgO layers grown by radiofrequency sputtering or electron-beam evaporation and in MgO-based magnetic tunnel junctions (MTJs) is probed after ... -
Boron nitride nanosheets as barrier enhancing fillers in melt processed composites
(2015)In this work we have used melt-processing to mix liquid-exfoliated boron–nitride nanosheets with PET to produce composites for gas barrier applications. Sonication of h-BN powder, followed by centrifugation-based size-selection, ...