Low-temperature spin-polarized scanning tunneling microscopy is employed to study spin transport across single cobalt-phthalocyanine molecules adsorbed on well-characterized magnetic nanoleads. A electronic resonance identified over the center of molecule and exploited spatially resolve stationary states. These states reflect two molecular orientations and, as established by density functional calculations, originate from a ferromagnetic molecule-lead exchange interaction.

1D assemblies of magnetic nanoparticles are great potential for designing novel nanostructured materials with enhanced collective properties. In that challenging context, a new assembly strategy is presented to prepare chains well‐defined in structure and spatial arrangement. The iron oxide onto substrate controlled using “click” chemistry under an external field. Co‐aligned single nanoparticle separated by regular distances can be obtained this strategy. intrinsic high uniaxial anisotropy...

Low-temperature scanning tunneling spectroscopy over Co nanoislands on Cu(111) showed that the surface states of islands vary with their size. Occupied exhibit a sizeable downward energy shift as island size decreases. The position occupied also significantly changes across islands. Atomic-scale simulations and ab inito calculations demonstrate driving force for observed is related to size-dependent mesoscopic relaxations in nanoislands.

We exploit several scanning tunneling microscopy (STM) techniques, such as atom manipulated scans and constant-height scans, to atomically resolve the adsorption geometry of isolated cobalt-phthalocyanine (CoPc) molecules on a copper (111) surface obtain proper low-temperature maps molecular conductance. By comparing these crucial findings density functional calculations, we then provide fresh insight into CoPc−metal interface. This innovative STM study should be applicable wide variety...

Low-temperature scanning tunneling microscopy and spectroscopy combined with first-principles simulations reveal a nondissociative physisorption of ferrocene molecules on Cu(111) surface, giving rise to ordered molecular layers. At the interface, 2D-like electronic band is found, which shows an identical dispersion as Shockley surface-state band. Subsequent deposition Cu atoms forms charged organometallic compounds that localize interface-state electrons.

A low-temperature scanning tunneling microscope is employed to build a junction comprising Co atom bridging copper-coated tip and Cu(100) surface. An Abrikosov-Suhl-Kondo resonance evidenced in the differential conductance its width shown vary exponentially with ballistic for all tips employed. Using theoretical description based on Anderson model, we show that Kondo effect total are related through atomic relaxations affecting environment of atom.

The controlled switching of spontaneous polarization in ferroelectrics by applying an external electric field is essential for many device operations. Oxygen vacancy defects commonly found oxide offer a tempting means regulation at atomic scale. This study presents method involving series annealing cycles under various environments to modulate the amount oxygen vacancies ferroelectric ${\mathrm{Bi}}_{2}{\mathrm{FeCrO}}_{6}$ thin films. By performing piezoresponse force microscopy after each...

An atomic force microscope reveals that the sliding of a nanotip on graphite surface occurs through nanoscale stick-slip mechanism. The angle between direction and stiff crystallographic axis determines periodicity slip events defining domains various friction properties. experimental data are interpreted using reaction rate theory, with energy barrier driven by local deformation thermally activated relaxation.

The hysteretic nature of the photovoltaic response and its nonlinear character can be used to optimize performance future ferroelectric-based solar cells.

Low-temperature scanning tunneling microscopy and spectroscopy are employed to investigate electron from a ${\mathrm{C}}_{60}$-terminated tip into Cu(111) surface. Tunneling between ${\mathrm{C}}_{60}$ orbital the Shockley surface states of copper is shown produce negative differential conductance (NDC) contrary conventional expectations. NDC can be tuned through barrier thickness or orientation up complete extinction. The dependence result symmetry matching molecular states.

We present an experimental and theoretical study on how thermal energy alters van der Waals adhesion forces in nanoscale contacts stretched by mechanical probes. The force follows a distribution whose density function is asymmetric bell-shaped curve presenting temperature-dependent negative skewness. With increasing temperature the asymmetry increases whereas most probable value decreases. Using 2--8 Lennard-Jones interaction potential within reaction rate theory, we offer framework...

A key stage in engineering molecular functional organizations is represented by controlling the supramolecular assembly of single building blocks, tectons, into ordered networks. Here, we show how an open-shell, propeller-like molecule has been deposited under UHV conditions on Au(111) and its organization characterized scanning tunneling microscopy (STM). Racemic islands were observed at room temperature, their chirality was imaged level low temperature. Modeling further suggests that...

The force needed to move a nanometer-scale contact on various oxide surfaces has been studied using an atomic microscope and theoretical modeling. Force-distance traces unveil stick-slip movement with erratic slip events separated by several nanometers. A linear scaling of friction normal load along low pull-off forces reveals dispersive adhesive interactions at the interface. We model our findings considering variable Lennard-Jones-like interaction potential, which accounts for slip-induced...

Single Ni, Co, and Cu atoms deposited in the center of cobalt nanoislands grown on Cu(111) are investigated by low-temperature scanning tunneling spectroscopy. The surface states this model magnetic nanolead unveiled assigned to arise from atomiclike surface-induced ab initio calculations. Contrary first, second contribution is predicted calculations favor a change sign spin polarization with respect pristine lead.

The kinetic friction of the (0001) graphite surface has been mapped at different speeds and scales by means an atomic force microscope. maps show nanoscale domains various sizes strengths. Each domain presents a transition between two regimes specific logarithmic scaling with speed. gradient this variation is determined angle macroscopic sliding direction stiff crystal axis lattice. experimental results are analyzed considering thermally activated within puckering mechanism.

We report on the ferroelectric properties of epitaxially grown Bi2FeCrO6 (BFCO) films with thicknesses 7.5, 49, and 98 nm obtained by pulsed laser deposition. Because strains induced Nb-doped SrTiO3(001) substrate, exhibit a variable Fe–Cr order along growth axis, disordered phase located near interface an increased at top films. This is first evidenced X-ray diffraction UV–vis–NIR absorption measurements as ordered/disordered phases show different lattice parameters band gaps. The strain...

We present an approach in which field-dependent magnetic force microscopy (MFM) is used order to determine the properties of individual nanodots. In this work, integral value cantilever phase shift obtained vibrating MFM experiment as a measure field dependent magnetization single objects. The method accounts for details that are resolved at 10 nm scale, including fine structures during reversal. Measurements have been done on model system embedded dots since flatness free surface reduces...

Scanning tunneling spectroscopy measurements on Co nano-clusters grown $\mathrm{Au}(111)$, revealed the presence of two peaks in electronic states, below and above Fermi energy. Ab initio calculations show that both are due to spin-polarized surface states. The crystallographic stacking shown influence strongly energy shift filled providing a way increase low bias spin current magnetic tunnel junctions. Due small lateral dimensions...

We report on the interplay between structural and magnetic properties of different size dots patterned in two structurally CoPt thin films with L10 order. The significant changes observed domain configuration coercive field samples are interpreted light crystalline structure. hysteresis curves measured for single/several compared to those dot assembly discussed view structure edge defects. In particular, concentration fluctuations found enlarge switching distribution despite presence a...

This work reports about nanoparticle dipolar effects and substrate to interaction by modeling the surface plasmon scattering cross-section on experimental two dimensional monolayers <italic>versus</italic> three randomly distributed assemblies.

The usage of magnetic nanoparticles (NPs) in applications necessitates a precise mastering their properties at the single nanoparticle level. There has been lot progress understanding NPs, but incomparably less when interparticle interactions govern overall response. Here, we present quantitative investigation fields generated by small clusters NPs assembled on dielectric non-magnetic surface. Structures ranging from individual to fifth-fold particulate are investigated magnetization...