Using inverse photoemission and we find that the bulk bands become discretized in highly perfect layer structures, such as Cu on fcc Co(100), Fe(100), Ag bcc Au Fe (100), Co Cu(100), Au(100). The electronic structure is analyzed framework of quantum-well states consisting Bloch functions modulated by an envelope function. wavelength function determined from \ensuremath{\lambda}/2 interferometer fringes produced periodic appearance with increasing film thickness. k conservation, one obtains...

The surface magneto-optic Kerr effect (SMOKE) was used to investigate the magnetic properties of epitaxial thin films Co, Ni, and their alloys grown on Cu(100) Cu(111). Curie temperature ${\mathit{T}}_{\mathit{C}}$ is higher for same a given thickness Cu(111) than Cu(100). All show change in power-law exponent \ensuremath{\beta} magnetization density M\ensuremath{\sim}(1-T/${\mathit{T}}_{\mathit{C}}$${)}^{\mathrm{\ensuremath{\beta}}}$ with reducing film thickness. Ni undergo particularly...

We have used molecular-beam epitaxy to grow high-quality pseudomorphic Ni and Co1Ni9 films on Cu(001). From temperature-dependent surface magneto-optic Kerr effect measurements of these films, we determined the finite-size scaling behavior Curie temperature ultrathin for a thickness range n=2.5–16 monolayers (ML). The film dependent each ferromagnetic thin-film systems, TC(n), is described by formula: [TC(∞) − TC(n)]/TC(n) = [(n n′)/n0]−1/ν, where TC(∞) bulk temperature, n0=2.5±0.5 ML Co...

Angle-resolved photoemission is used to determine the energy bands of permalloy (Ni0.8Fe0.2) and compare them Ni, Co, Cu. The momentum resolution (≈0.01 eV ≈0.01 Å−1) high enough resolve magnetically split at Fermi level that are responsible for spin-dependent conductivity tunneling. For Σ1 band we find magnetic exchange splittings δEex=0.27 (0.23 Ni), δkex=0.16±0.02 Å−1 (0.12±0.01 velocity vF↑=(0.22±0.02)106 m/s (0.28×106 0.33×106 fcc Co), widths δk↑⩽0.11 δk↓=0.24 Å−1. Compared features a...

The magnetization reversal in four arrays of micron-size circular holes (antidots) a Permalloy film has been studied by means quantitative magneto-optic Kerr vector magnetometry and magnetic force microscopy. primitive antidot meshes the investigated here can be classified as square, rectangular, hexagonal, oblique. data show that hole induce anisotropy completely different from unpatterned film, with new hard axes along directions connecting nearest neighboring holes. Also coercive field is...

Asymmetries were observed across a monolayer of dimethylanilinoaza[C60]fullerene, (DMA-NC60, 1) sandwiched between gold electrodes relatively large size (0.265 mm2). Two modes behavior are observed: (1) sigmoidal and slightly asymmetric behavior, bespeaking moderate unimolecular rectifier (rectification ratio about 2), (2) above threshold voltage V1 (≈0.6 to 1.0 V), dramatic increase current 0.3 1 A (as high as 1.36 × 107 electrons molecule-1 s-1 at 1.5 followed by ohmic from smaller...

Chiral nanostructured thin films can be produced through precise control of the angle incidence a vapor flux concurrent with substrate rotation. The technique has been employed to create unique porous iron film structures on Si(100) columnar microstructure. Scanning electron microscopy images illustrate azimuthal rotation during sample growth incident at an 75° respect surface normal. columns were found well isolated narrow distribution diameters, resulting in aspect ratios approximately 8...

The magnetic properties of antidot arrays in permalloy films were studied using force microscopy (MFM), the magneto-optical Kerr effect (MOKE), and torque magnetometry. New observations domain structure, magnetization reversal process, anisotropy are presented. Magnetic domains imaged during to identify switching processes with field applied along diagonal edge hole mesh. A four-fold related confinement by mesh was observed magnetometry at intermediate fields.

Dipole induced, spatially localized ferromagnetic resonances (at 35 GHz) are observed in micron-sized antidot arrays permalloy films fabricated with photolithography. All square (3 μm×3 μm) and rectangular μm×4, 5, 7 array samples exhibit double resonances, each resonance possessing uniaxial in-plane anisotropy. Interestingly, the easy axes of two orthogonal all cases. The magnitude induced dipolar anisotropy decreases increasing aspect ratio for one but remains essentially constant other....

We report angle-resolved inverse-photoemission spectroscopy and ultraviolet-photoemission-spectroscopy measurements of the electronic structure Cu(100), Ni(100), pseudomorphic films fcc Co Fe on Cu(100). The unoccupied critical points at X are determined. These results combined with recent photoemission data for use as input to an empirical combined-interpolation-scheme calculation energy-band dispersions allowed bands ${\mathit{k}}^{\mathrm{\ensuremath{\parallel}}}$=0. ferromagnetic...

Magnetic and structural properties of MnBi films with thicknesses up to 50 nm were investigated. Thin the LTP (Low Temperature Phase) fabricated onto silica-glass substrates by sputter-deposition Bi/Mn multilayer, followed a subsequent annealing at about 550 °C for 30 min. Coercivity such thin is higher than 15 kOe, even though film thickness 10 nm. These show preferential growth c-axis along normal. Moreover, high resolution transmission electron microscopy indicates that regions 30–50 in...

The magnetism of antiferromagnetic ${\mathrm{Fe}}_{x}{\mathrm{Pt}}_{1\ensuremath{-}x}$ thin films $(x=0.27$ and 0.30) epitaxially grown onto MgO (110) a-axis sapphire $(\ensuremath{\alpha}{\ensuremath{-}\mathrm{A}\mathrm{l}}_{2}{\mathrm{O}}_{3})$ substrates has been studied by elastic neutron x-ray scattering. Bulk chemically ordered ${\mathrm{FePt}}_{3}$ exhibits an spin structure with a wave vector ${Q}_{1}=2\ensuremath{\pi}/a(\frac{1}{2}\frac{1}{2}0)$ below...

With one of the highest intrinsic magnetic moments $(10.6\phantom{\rule{0.16em}{0ex}}{\ensuremath{\mu}}_{B}/\mathrm{atom})$ among heavy rare-earth elements, dysprosium exhibits a rich phase diagram, including several modulated phases. Aided by Ruderman-Kittel-Kasuya-Yosida interaction, modulations propagate coherently over long range. Neutron diffraction experiments were performed to determine microscopic origin field induced phases in bulk Dy as function temperature, covering regions...

We use first principles electronic structure techniques to study the magnetic of γ-FeMn using Korringa–Kohn–Rostocker multiple-scattering approach in conjunction with an extension single site coherent potential approximation noncollinear structures. Our results show that 3Q and 2Q structures are both stable solutions former being slightly lower energy. The collinear could only be converged a traditional spin-polarized calculation unstable treatment.

We have grown ultrathin Co${}_{x}$Ni${}_{1\ensuremath{-}x}$ and Fe${}_{x}$Ni${}_{1\ensuremath{-}x}$ films on Cu(100) with varying stochiometry $x$. find that these alloy grow in a fcc phase Cu(100). With the surface magneto-optic Kerr effect we measured variation of Curie temperature ${T}_{C}$ as function film thickness $n$ monolayers. Fitting an empirical scaling curve to our results are able extrapolate value ${T}_{C}(n=\ensuremath{\infty})$ for samples different stochiometry. use this...

Self-assembled copper nanowires were deposited on native oxide Si(100) substrates using glancing angle deposition with and without substrate rotation. Wire morphology, texture crystallographic orientation are strongly dependent the parameters. A method for determining preferred crystal is described. This found to be different from what expected geometric of wires. For wires rotation, face-centered-cubic (fcc)(111) orientation, which corresponds close-packed, low surface energy (111) plane...

Co 90 Fe 10 films with an in-plane uniaxial magnetic anisotropy have been grown on obliquely sputtered thin Ru underlayer. The field can be increased up to 200 Oe. hysteresis curves show a very high squareness in the easy axis direction and almost no hard direction, suggesting that induced is uniform throughout films. switching characteristics of nanoelements fabricated from by e-beam lithography are also investigated. There degradation after annealing lithographical process.

The growth of large area single-layer graphene (1-LG) is studied using ambient pressure chemical vapor deposition on single-crystal Ni(111), Ni(110), and Ni(100). By varying both the furnace temperature in range 800--1100 \ifmmode^\circ\else\textdegree\fi{}C gas flow through chamber, uniform, high-quality 1-LG obtained for Ni(111) Ni(110) single crystals Ni(100) thin films. Surprisingly, only multilayer could be experimental results are analyzed to determine optimum combination flow....

Abstract Palladium doped iron rhodium is a magnetic material of significant interest for it's close to room temperature magnetostructural phase transition from antiferromagnetic (AF) ferromagnetic (FM) ordering. Here we report on the peculiarities magnetization distribution in thin films FeRh(Pd) probed by Polarized Neutron Reflectometry. Remarkably, we've found interfacial regions with strong that have unique thermomagnetic properties as compared rest system. These exist at top and bottom...

The effect of interface roughness on exchange bias for NiFe/FeMn bilayers is investigated polycrystalline films and epitaxial films. Three different systems were investigated: Ta (10 nm)/Ni80Fe20 (10nm)/Fe50Mn50 (20 nm) oxygen plasma-etched Si(100) or Cu/H–Si(100) Ni80Fe20 (10nm)/Fe60Mn40 Cu/H–Si(110). For grown substrates, as the etching time increased, film increases up to 12 nm. ultrathin Cu underlayers, x-ray diffraction shows fcc (111) texture greatly reduced thickness increased....

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation G. J. Mankey, M. T. Kief, R. F. Willis; The effect of microstructure on the magnetic behavior epitaxial cobalt layers. Vac. Sci. Technol. A 1 May 1991; 9 (3): 1595–1598. https://doi.org/10.1116/1.577666 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks...

Spin wave modes in permalloy antidot arrays have been investigated with ferromagnetic resonance at 9.7 GHz. In contrast to a quadratic dispersion expected for exchange standing spin waves, nearly linear relationship exists between the field and mode index, it can be approximately described by dipole-dipole theory. Time-dependent micromagnetic simulations show that are result of lateral confinement from vacant holes. Furthermore, visually reveal existence localized waves due boundary...

For high frequency device applications, a systematic study of the soft magnetic properties and magnetization dynamics (FeCo)-Al alloy thin films has been carried out. A low effective damping parameter αeff 0.002 saturation about 1,800 emu/cc are obtained at y=0.2∼0.3 for (Fe1-yCoy)98Al2 deposited onto fused silica MgO(100) an ambient temperature during deposition. Those bcc structure with <110> orientation normal to film plane. They possess columnar structure, grown along...