Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1995-1999  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Interface alloying at Fe/Cr interfaces and its role in exchange coupling, angular resolved Auger electron, magneto-optic Kerr effect, and Brillouin light scattering studies (invited) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4518-4523 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Angular resolved Auger electron studies were carried out for Fe whisker/Cr(001) interfaces which were prepared at 100, 180, 246, and 296 °C. The Cr atoms penetrate progressively into the second (counting from the surface) atomic layer at 100, 180, and 246 °C. At 296 °C the Cr atoms enter the third atomic layer. No noticeable fraction of the Cr atoms was found in the fourth atomic layer. The exchange coupling was studied in Fe whisker/Cr/Fe(001) films which were grown in a nearly perfect layer by layer mode. Magneto-optic Kerr effect and Brillouin light scattering measurements showed that the measured change in the phase of the short wavelength oscillations, the presence of a slowly varying exchange coupling bias, and the small measured values of exchange coupling are caused by the same mechanism: interface alloying. The exchange coupling in Fe whisker/Cr/nFe specimens, for n=10, 20, 30, and 40 ML, showed no obvious dependence on the Fe layer thickness. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361768
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Dependence of anti-Stokes/Stokes intensity ratios on substrate optical properties for Brillouin light scattering from ultrathin iron films : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 6296-6298 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Brillouin light scattering experiments have been used to investigate the intensity of 5145 Å laser light backscattered from spin waves in 20 monolayer thick Fe(001) films. The experiments have shown that the ratio of frequency upshifted light intensity to frequency downshifted light intensity depends upon the material of the substrate used to support the iron films. For a fixed magnetic field and for a fixed angle of incidence of the laser light this intensity ratio is much larger for an iron film deposited on a sulphur passivated GaAs(001) substrate than for an iron film deposited on a Ag(001) substrate. The data have been compared with a calculation that takes into account multiple scattering of the optical waves in the iron film and in a protective gold overlayer. The observations are in qualitative agreement with the theory, except for angles of incidence greater than 60°. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367914
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Studies of interlayer exchange coupling in Fe/Cu/Fe ultrathin heterostructures : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3904-3906 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The interlayer exchange coupling has been investigated in trilayer structures where two coupled Fe layers were separated by a modified Cu spacer. The multilayer heterostructures investigated in this article have the following general structure: Fe1/kCu/lXcCu1−c/mCu/Fe2, where XcCu1−c indicates one atomic layer of Cu atoms alloyed with foreign X atoms of concentration c. Fe1 and Fe2 indicate bottom and top ferromagnetic iron layers, respectively. k, l, and m represent the number of atomic layers (AL) yielding a total spacer thickness of (k+l+m) AL. The ultrathin films were grown using a molecular beam epitaxy system. Atoms X (Fe,57Fe,Cr,Ag) were codeposited simultaneously with the Cu atoms to create an alloyed layer. Foreign atoms were introduced in the spacer to study their effect on the direct interlayer exchange coupling between the outside Fe layers mediated by the valence electrons of the Cu spacer. The ferromagnetic resonance, magneto-optical Kerr effect, and Brillouin light scattering techniques were employed to determine the exchange coupling in these structures. Mossbauer spectroscopy was used to identify the magnetic state of the 57Fe atoms in the alloyed 57FecCu1−c layer. The results have shown that the presence of foreign atoms inside the Cu spacer significantly decreases the bilinear antiferromagnetic coupling between the Fe layers by creating a potential barrier for the valence Cu electrons. More significantly, the exchange coupling showed a very strong dependence on the magnetic state of the foreign atom. For high concentrations of Fe in the spacer, the coupling was found to be ferromagnetic due to partial magnetic ordering of the iron atoms. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365065
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Role of interfaces in the exchange coupling of Fe/Cr/Fe(001) systems : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4350-4352 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Exchange coupling has been studied in Fe whisker/Cr/Fe(001) systems that were grown in a perfect layer by layer mode. The exchange coupling through Cr was found to be very sensitive to alloying at the Fe whisker/Cr(001) interface. It will be shown that the observed reversed phase of the short wavelength oscillations compared to those predicted by ab initio calculations can be caused by alloying at the Fe whisker/Cr(001) interface. In order to test this point, we have grown samples with the Cr/Fe(001) interface intentionally alloyed by codepositing the Cr and Fe atoms during the formation of the last Cr atomic layer. The strength of the exchange coupling has also been investigated in systems fabricated with heterogeneous spacers using bcc Cu(001) and fcc Ag(001). Cu and Ag layers have been inserted between the Cr spacer and the Fe(001) film. The strength of the antiferromagnetic coupling was found to be substantially increased due to the presence of Cu at the Cr/Fe(001) interface. It will be argued that the observed increase in the exchange coupling is caused by an increased asymmetry in spin dependent reflectivity at the Cr/Cu/Fe interface. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364766
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Chlorobiphenyl (PCB) composition of extracts of subsurface soil, superficial dust and air from a contaminated landfill (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 442-448 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Samples of 3 matrices (air, superficial dust and subsurface soil) from an aged PCB-containing landfill were extracted and the extracts refined for bioassay. Acetone:hexane extraction was modestly selected for non-planar compounds. Coplanar PCBs and PCDFs were enriched about 2-fold in the subsequent benzene:methylene chloride extracts of the soil. Extract refinement with Florisil slurry and alumina column chromatography did not appreciably change the composition of the extracts. CB 28 (2,4,4′-triCB) dominated in all extracts. The congener composition of soil and air were surprisingly similar, being enriched in tri- and tetraCBs while dust retained higher proportions of congeners with 4 and 5 chlorines. It is postulated that anaerobic dechlorination in the moist subsurface soil depleted the higher chlorinated congeners; more volatile congeners escaped into the atmosphere while moderately chlorinated congeners were trapped in the superficial dust and debris. The refined extracts represent distinct compositions of environmental PCB mixtures suitable for bioassay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050186
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Scavenging processes and export fluxes close to a retreating seasonal ice margin (Ross Sea, Antartica) (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 705-715 
    Details
    ISSN: 1573-2932
    Keywords: 234Th ; particle flux ; Ross Sea ; Antarctica ; organic C, N, Si ; scavenging rates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The distribution of dissolved and particulate234Th in the upper 200 m of the water column was obtained for three stations in the Ross Sea off Victoria Land and Terra Nova Bay. At site 24a, close to the retreating ice margin, all the sampled depths showed deficiencies in234Th relative to the equilibrium with238U. These are related to uptake of234Th onto sinking particles. Residence times of234Th in solution and of particulate234Th were 130–247 days and 8.1–6.6 days, respectively. A high particle flux (1.23–5.03 g m−2 d−1) was calculated at this station. At the other two sites (11c and 15c),234Th depth profiles are irregular, probably due to the release of dissolved234Th by decomposing particles at certain depths, or to the contribution from lateral advection. Bulk mass fluxes measured by floating traps at stations 11c and 15c are very low (66–138 mg m−2 d−1). Also fluxes of organic carbon and nitrogen, and biogenic silica are reported for these two sites. The calculated fluxes are discussed with respect to methodologies and to the dynamics of the ice margin retreat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02406910
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Injection effects and intermediation: Yeager and the Austrians (1999)
    Springer
    International advances in economic research 5 (1999), S. 395-395 
    Details
    ISSN: 1573-966X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02296421
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Vapour deposited cone formation during fabrication of low voltage field emitter array cathodes (1996)
    Springer
    Journal of materials science 31 (1996), S. 1789-1796 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A line-of-sight vapour deposition process is used to form a low-voltage field emission cathode structure on the surface of an oxide-metal eutectic composite etched to expose arrays of single-crystal tungsten fibres. A SiO2 insulating film is first deposited, forming cone-shaped deposits on the tips of the exposed fibres. These cones act as a shadow mask for the subsequent deposition of a metal film. After removal of the cones, the metal film forms a grid-like structure with concentric apertures centered on each fibre tip. Application of a potential of less than 100 V between the metal grid and the base of the fibres produces an electric field at the fibre tips of sufficient intensity to produce field emission. The equilibrium geometry of the deposits which form on the fibre tips (cathode cones) is such that there is a linear relationship between the height of the cone and its diameter. There is also a direct correlation between the cathode cone angle, which depends on the material being deposited, and the cone angle of the insulator film. For SiO2, the cathode cone angle was determined to be 37°, while the cone angle of the insulator film was 26°. Comparison of the theoretical values of the lateral growth velocity of the cathode cones with values determined from experimental measurements indicated that the maximum sticking coefficient was independent of the growth angle, η, for SiO2, but varied as a function of cos η for molybdenum. A multiple deposition process was developed which permitted independent control of the interelectrode spacing and insulator film thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00372192
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...