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Fe Films (fe + film)

Distribution by Scientific Domains
Physics and Astronomy71%

Selected Abstracts

Magneto-optical, optical and magnetic properties of the Mn1,xFex alloy films

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 1 2003
Y. V. Kudryavtsev
Abstract A set of Mn1,xFex alloy films with 0 < x < 1 has been prepared by face-to-face DC sputtering onto glass substrates kept at 293 K. The X-ray diffraction study reveals that an , -Fe phase with bcc-type of structure is the prevailing phase for the Mn1,xFex alloy films with 0.8 < x < 1, while , -Mn,Fe and , -Mn phases are dominant for 0.2 < x < 0.8 and x < 0.2, respectively. The experimental equatorial-Kerr-effect spectra for Mn1,xFex alloy films, which are observed only for x < 0.5, have nearly the same spectral shape (Fe-like), and differ from each other only by the intensity. They are nicely reproduced in the framework of the effective medium approximation by using scaled off-diagonal components of the dielectric function for pure Fe film and measured optical constants for the corresponding alloys. The optical properties of all the investigated alloys can be separated into three groups which are related to different prevailing crystalline structures of alloys. [source]

Experimental and theoretical study of the magnetic properties and XMCD spectra of Ru clusters deposited on Fe/Cu(001)

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 5 2010
J. Minár
Abstract We present results of an experimental study of magnetic properties of small Ru clusters deposited on a thin Fe film grown on Cu(001) surface. X-ray magnetic circular dichroism (XMCD) measurements show finite spin and orbital moments of Ru dimers and trimers, however a magnetic moment for a Ru monomer has been not observed. A corresponding theoretical study based on the fully relativistic multiple scattering KKR method is presented. Detailed theoretical analysis has been performed to explain the experimental findings. In particular a direct comparison of the calculated XMCD with the experiments suggests diffusion into the surface as a possible reason for the apparent quenching of the spin magnetic moment for Ru monomers. [source]

Growth and Mechanism of Network-Like Branched Si3N4 Nanostructures

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 8 2010
Zhijian Peng
The high-yield synthesis of network-like branched silicon nitride (Si3N4) nanostructures by a simple template catalyst-assisted pyrolysis of a polymer precursor, perhydropolysilazane, was reported. The templates were silicon wafers deposited with Fe films of 5,20 nm in thickness. The processes simply involved thermal cross-linking of the preceramic polymer, crushing of the solidified polymer chunks into fine powder, and thermal pyrolysis of the powder under flowing high-purity nitrogen. The collected white network-like branched nanostructures are ,-Si3N4 of hexagonal phase, and their microstructures, in which the diameters of each linear part of the network-like nanostructure varied in a very wide range from tens of nanometers to hundreds of nanometers, strongly depend on the applied growth parameters, where the key factors are the heating rate and catalyst thickness for change in the diameters. It was proposed that the Si3N4 nanonetworks were formed through "metal-absorption on the surface of nanostructures" model by vapor,liquid,solid mechanism. The reaction mechanism of Si3N4 nanonetworks was also discussed. [source]

Plasmon induced modification of the transverse magneto-optical response in Fe antidot arrays

PHYSICA STATUS SOLIDI - RAPID RESEARCH LETTERS, Issue 10 2010
J. F. Torrado
Abstract In this Letter we present the effects that the excitation of plasmon-like modes in periodically perforated Fe films have over the Transverse Magneto-Optical Kerr Effect (TMOKE). The excitation of the modes gives rise to clear signatures in the TMOKE spectra. We analyze the spectral position of the structures as a function of both the polar and azimuth angle. Schematic representation of the system, and TMOKE signal for a Fe membrane along , = 0°. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Anisotropic FMR-linewidth of triple-domain Fe layers on hexagonal GaN(0001)

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 7 2006
M. Buchmeier
Abstract We present a ferromagnetic resonance (FMR) study of Fe films with thicknesses between 5 and 70 nm prepared by electron-beam evaporation on top of hexagonal GaN(0001). X-ray diffraction (XRD) and low-energy electron diffraction (LEED) suggest the growth in crystallographic Fe(110) domains with three different orientations. The magnetic properties have been investigated by in-plane angle-dependent FMR at frequencies between 4.5 to 24 GHz. All samples show a hexagonal in-plane anisotropy with the easy axes oriented parallel to the Fe [001] directions. The anisotropy field strength of about 8 mT reveals a bulk-like thickness dependence. Therefore, we can exclude the following origins of anisotropy: (i) interface effects because of the bulk-like thickness dependence and (ii) averaged first order cubic or uniaxial anisotropies arising from the three grain orientations because of the relative strengths. We qualitatively explain the sixfold anisotropy by spin relaxation inside the grains. The FMR linewidth versus frequency curves are linear with almost no zero-frequency offset indicating a good homogeneity of the magnetic properties over the sample area. However, the effective damping parameter , shows pronounced anisotropy and thickness dependence, with enhanced damping along the hard axes and for thicker layers. We suggest that the additional damping can be explained by two-magnon scattering at defects which are due to the triple domain structure. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Photoinduced spin waves in Fe/AlGaAs (001) heterostructure

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 8 2008
H. B. Zhao
Abstract Photoinduced spin waves are investigated for Fe films on AlGaAs (001) using the time resolved magneto-optical Kerr effect. We observe first and second order standing spin waves as well as uniform magnetization precession. The anisotropy fields and exchange stiffness constant are obtained from the field and azimuthal dependence of the spin wave frequencies using the Landau-Lifshitz-Gilbert equation. A comparison with spin wave resonance measurements reveals a more pronounced interface effect on the low order standing spin waves in thin films. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Deposition of copper-doped iron sulfide (CuxFe1,xS) thin films using aerosol-assisted chemical vapor deposition technique

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 10 2010
Sujit D. Disale
Abstract Copper-doped iron sulfide (CuxFe1,xS, x = 0.010,0.180) thin films were deposited using a single-source precursor, Cu(LH)2Cl2 (LH = monoacetylferrocene thiosemicarbazone), by aerosol-assisted chemical vapor deposition technique. The Cu-doped FeS thin films were deposited at different substrate temperatures, i.e. 250, 300, 350, 400 and 450 °C. The deposited thin films were characterized by X-ray diffraction (XRD) patterns, Raman spectra, scanning electron microscopy, energy dispersive X-ray analysis (EDX) and atomic force microscopy. XRD studies of Cu-doped FeS thin films at all the temperatures revealed formation of single-phase FeS structure. With increasing substrate temperature from 250 to 450 °C, there was change in morphology from wafer-like to cylindrical plate-like. EDX analysis showed that the doping percentage of copper increased as the substrate temperature increased from 250 to 450 °C. Raman data supports the doping of copper in FeS films. Copyright © 2010 John Wiley & Sons, Ltd. [source]