The formation of magnetic domains in thin epitaxial Co/Au(111) films is investigated. Three-monolayer are shown to decay into out-of-plane micron size. We find a smooth transition from in-plane magnetization at crossover thickness 4.5 layers and determine that the domain size depends linearly on film below crossover.

The magnetization direction switching is investigated in epitaxial Fe/Cu(100) films by spin-polarized scanning electron microscopy. We follow the transition from perpendicular to in-plane with both increasing film thickness and varying temperature. No variation of magnetic moment change found. A stripe domain configuration identified which evolves low-temperature single-domain state during reorientation phase transition.

Direct observations of current-induced domain-wall propagation by spin-polarized scanning electron microscopy are reported. Current pulses move head-to-head as well tail-to-tail walls in submicrometer Fe20Ni80 wires the direction flow, and a decay wall velocity with number injected current is observed. High-resolution images domain reveal that spin structure transformed from vortex to transverse configuration subsequent pulse injections. The change directly correlated velocity.

Ultrafast magnetic field pulses as short 2 picoseconds are able to reverse the magnetization in thin, in-plane, magnetized cobalt films. The applied plane of film, and their direction encompasses all angles with magnetization. At a right angle magnetization, maximum torque is exerted on spins. In this geometry, precessional reversal can be triggered by fields small 184 kiloamperes per meter. Applications future ultrafast recording schemes foreseen.

The first direct observation of charge order Ni(3+delta(')) and Ni(3-delta) by resonant x-ray scattering experiments in an epitaxial film NdNiO3 is reported. A quantitative value delta+delta(') = (0.45 +/- 0.04)e was obtained. temperature dependence the deviates significantly from those magnetic moment crystallographic structure. This might be indication a difference their fluctuation time scales. These observations are discussed terms temperature-driven metal-insulator transition RNiO3 family.

The magnetic anisotropy in Co films epitaxially grown on Cu(100) is found to oscillate as a function of the thickness. oscillation period corresponds one monolayer, revealed by measuring magneto-optical Kerr hysteresis loops during film growth. These oscillations are attributed periodic variations morphology alternating between filled and incompletely atomic layers.

Abstract The formation of permanent or reversible metallic patterns on a substrate has applications in microfabrication and analytical techniques. Here, we investigate how to metallize an elastomeric stamp, either for processing mediated by the proximity between metal stamp active layer substrate, contact printing from substrate. stamps were made poly(dimethylsiloxane) (PDMS) modified before metallizing them with Au adding removing their bulk mobile silicone residues, oxidizing surface O 2...

The magnetic ordering of very thin Gd layers on Fe(100) has been characterized with use the element-specific resolving power spin-polarized Auger spectroscopy. We find antiparallel coupling to Fe substrate, and identify surface-specific temperature dependence sublattice magnetizations. correlation length in above its is obtained.

Direct observation of current-induced propagation purely transverse magnetic domain walls with spin-polarized scanning electron microscopy is reported in Fe30Ni70 nanowires. After propagation, the keep their nature but switch polarity some cases. For uniform Ni70Fe30 wires, effect random and illustrates domain-wall above Walker threshold. In case Ni{70}Fe_{30}/Fe magnetization component wall entirely determined by current pulse, an that not reconciled present theories even when taking into...

The magnetic anisotropy of Co films grown on stepped Cu(100) substrates is found to oscillate with varying Cu overlayer thickness. We relate these oscillations the occurrence quantum well states in overlayer.

Magnetic domain walls have been studied in micrometer-sized ${\mathrm{Fe}}_{20}{\mathrm{Ni}}_{80}$ elements containing geometrical constrictions by spin-polarized scanning electron microscopy and numerical simulations. By controlling the constriction dimensions, wall width can be tailored type modified. In particular, of a ${180}^{\ifmmode^\circ\else\textdegree\fi{}}$ N\'eel strongly reduced or increased geometry compared with unconstrained systems.

Density functional theory (DFT) and low-temperature scanning tunneling microscopy (STM) have been combined to examine the bonding of individual ${\mathrm{C}}_{60}$ molecules on Cu(111). Energy-resolved differential-conductance maps measured for adsorbed a Cu(111) surface by means STM, which are compared complemented theoretically computed spectral images. It has found that chemisorbs with six-membered ring parallel at two different binding sites constitute exclusive hexagonal sublattices. On...

We report the first observation of a transient all electric field induced magnetic anisotropy in thin film metallic ferromagnet. generate with strong (approximately 10(9) V/m) and short (70 fs) E-->-field pulse. This is large enough to distort valence charge distribution metal, yet its duration too brief change atomic positions. pure electronic structure alteration sample generates new type axis strongly influences magnetization dynamics. The successful creation such an opens possibility for...

The inhomogeneous magnetic stray field of micromagnets has been extensively used to manipulate electron spin qubits. By means micromagnetic simulations and scanning superconducting quantum interference device microscopy, we show that the polycrystallinity magnet nonuniform magnetization significantly impact corresponding qubit properties. random orientation crystal axis in polycrystalline Co magnets alters frequencies by up 0.5 GHz, compromising single addressability gate fidelities. We map...

An analytical model to determine the stable configuration of thin ferromagnetic disks as a function their thickness and diameter is presented. The vortex core energy fully taken into account. includes materials with nonvanishing anisotropy. We find very good agreement micromagnetic simulations provided that finite difference calculation corrected for dipolar contribution arising from discreetness at edge.

Organic light-emitting diodes with ferromagnetic contacts are fabricated, and their emission intensity is studied at room temperature for parallel antiparallel magnetization configuration of anode cathode. Sweeping the magnetic field applied to electrode allows two electrodes be switched independently. The electroluminescence found enhanced as compared one. We show that this increase not evidence spin injection but a consequence magnetic-field dependence combined stray fields from electrodes.

We have investigated the threshold current density required for depinning a domain wall from constrictions in NiFe nanowires, which give rise to pinning potentials of fixed amplitude but variable profile. observed it vary linearly with angle triangular constriction. These results are reproduced using micromagnetic simulations including adiabatic and nonadiabatic spin-torque terms. By curve-fitting calculated variations experimental results, we obtain nonadiabaticity parameter...

The magnetic anisotropy of Co/Cu(001) films has been investigated by the magneto-optical Kerr effect, both in pseudomorphic growth regime and above critical thickness where strain relaxation sets in. A clear correlation between onset relaxation---as measured means reflection high-energy electron diffraction---and changes found. \textcopyright{} 1996 American Physical Society.

The response of magnetization to the application a magnetic field has been measured above Curie temperature ${\mathit{T}}_{\mathit{C}}$ in epitaxial Co films on Cu(100). Magnetic domain images have acquired up ${\mathit{T}}_{\mathit{C}}$. results suggest that for temperatures T>${\mathit{T}}_{\mathit{C}}$ system behaves like two-dimensional Heisenberg magnet.

Spin-polarized Auger spectroscopy is applied to a study of initial oxidation Fe(100). The O $\mathrm{KLL}$ lines are found exhibit positive (i.e., parallel the Fe magnetization) spin polarization for singlet and near zero or negative triplet final states. finding relevant an experimental determination orbital mixing coefficients. True secondary electrons reveal strongly spin-polarized O-induced structures at 3 12 eV above vacuum level.

Nondestructive magnetic depth profiling with spin polarization of secondary electrons reveals a particular state within the outermost 5 \AA{} Fe(100) surface. This is first step in reversed-domain nucleation and best described as very thin 90\ifmmode^\circ\else\textdegree\fi{} [100] wall, which forbidden bulk Fe.