ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
  • Articles  (6)
  • 75.70  (6)
  • Springer  (6)
  • American Meteorological Society
  • Wiley
  • 2020-2022
  • 2015-2019
  • 2005-2009
  • 1985-1989  (6)
  • 1960-1964
  • 1955-1959
  • 1935-1939
  • 2021
  • 1989  (6)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (6)
  • Natural Sciences in General
  • Geosciences
  • Energy, Environment Protection, Nuclear Power Engineering
Collection
  • Articles  (6)
Source
Keywords
Publisher
  • Springer  (6)
  • American Meteorological Society
  • Wiley
Years
  • 2020-2022
  • 2015-2019
  • 2005-2009
  • 1985-1989  (6)
  • 1960-1964
    • +
Year
Topic
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (6)
  • Natural Sciences in General
  • Geosciences
  • Energy, Environment Protection, Nuclear Power Engineering
  • Physics  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Development of magnetic anisotropies in ultrathin epitaxial films of Fe(001) and Ni(001) (1989)
    Springer
    Applied physics 49 (1989), S. 473-490 
    Details
    ISSN: 1432-0630
    Keywords: 75.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Ultrathin films, bcc Fe(001) on Ag(001), fcc Fe(001) on Cu(001) and Fe/Ni(001) bilayers on Ag, were grown by molecular beam epitaxy. A wide range of surface science tools were employed to establish the quality of epitaxial growth. Ferromagnetic resonance and Brillouin light scattering were used to extract the magnetic properties. Emphasis was placed on the study of magnetic anisotropies. Large uniaxial anisotropies with easy axis perpendicular to the film surface were observed in all ultrathin structures studied. These anisotropies were particularly strong in fcc Fe and bcc Fe films. In sufficiently thin samples the saturation magnetization was oriented perpendicularly to the film surface in the absence of an applied field. It has been demonstrated that in bcc Fe films the uniaxial perpendicular anisotropy originates at the film interfaces. In situ measurements indentified the strength of the uniaxial perpendicular anisotropy constant at the Fe/vacuum, Fe/Ag and Fe/Au interfaces asK us = 0.96, 0.63, and 0.3 ergs/cm2 respectively. The surface anisotropies deduced for [bulk Fe/noble metal] interfaces are in good agreement with the values obtained from ultrathin films. Hence the perpendicular surface ansiotropies originate in the broken symmetry at abrupt interfaces. An observed decrease in the cubic anisotropy in bcc Fe ultrathin films has been explained by the presence of a weak 4th order in-plane surface anisotropy,K 1∥S=0.012 ergs/cm2. Fe/Ni bilayers were also investigated. Ni grew in the pure bcc structure for the first 3–6 ML and then transformed to a new structure which exhibited unique magnetic properties. Transformed ultrathin bilayers possessed large inplane 4th order anisotropies far surpassing those observed in bulk Fe and Ni. The large 4th order anisotropies originate in crystallographic defects formed during the Ni lattice transformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617014
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Ultrathin film magnetic research at the Naval Research Laboratory (1989)
    Springer
    Applied physics 49 (1989), S. 513-521 
    Details
    ISSN: 1432-0630
    Keywords: 75.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Scientists at the Naval Research Laboratory have been using molecular beam epitaxy techniques to grow a variety of high quality magnetic transition metal (TM) films and superlattices having TM thicknesses in the 1–10 monolayer regime. The magnetic and structural properties of these samples have been studied with a wide variety of standard and spin-sensitive techniques, both in vacuo and, when suitably protected, in air. The magnetic behavior of the materials is strongly modified as the TM layers become ultrathin. This work is illustrated with examples involving ultrathin Fe layers on Ag(001), Fe/Ag(001) superlattices containing ultrathin Fe layers, and bcc Co on GaAs(110).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617018
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Magnetic surface anisotropy of transition metal ultrathin films (1989)
    Springer
    Applied physics 49 (1989), S. 499-506 
    Details
    ISSN: 1432-0630
    Keywords: 75.30G ; 75.30T ; 75.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In order to study the magnetic anisotropy of transition metal ultrathin films, we have performed tight-binding calculations including spin-orbit coupling. Beside the anisotropy energy these calculations also yield the orbital moment, which turns out to be much more anisotropic than in bulk materials. The effects of interfacial mismatch and roughness are discussed within phenomenological models. We also briefly review experimental results on the magnetic surface anisotropy (MSA) in transition metal ultrathin films. In some cases such as Au/Co/Au(111) sandwiches the MSA wins the competition with the shape anisotropy arising from the magnetostatic energy: below a critical thickness this leads to aperpendicular spontaneous magnetization. We show the effects of this crossover on the hysteresis loops and on the magnetoresistance, and the effects of interface roughness on the critical thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617016
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    EXAFS study of the atomic structure of amorphous Tb20Fe80 (1989)
    Springer
    Applied physics 49 (1989), S. 619-629 
    Details
    ISSN: 1432-0630
    Keywords: 75.50.K ; 75.70 ; 61.10.L ; 78.20.L ; 81.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The atomic structure of amorphous Tb20Fe80 thin films has been studied by Extended X-ray Absorption Fine Structure (EXAFS) of both FeK and TbL III absorption edges. The local site geometry around Fe atoms shows predominantly Fe nearest neighbors with an Fe-Fe distance distribution centered on 2.50±0.02 Å and a coordination number of 9.1±1. In contrast, the radial structure function (RSF) obtained at the Tb edge is broad and asymmetric. The peak in the RSF corresponds to a Tb-Fe near neighbor distance of 2.94±0.1 Å with no evidence for Tb-Tb nearest neighbor coordination. The width and the shape of the RSF suggest that the Tb-Fe atomic environment is anisotropic and strained probably as a consequence of the growth process. This distorted atomic environment is suggested to be responsible for the magnetic anisotropy in these alloys. Thermal annealing at 200 °C leads to reduction inK u. We propose that this results from reordering of the Tb local environment such that the average structural anisotropy in the distribution is reduced. EXAFS data show that annealing at 400°C causes precipitation of bcc polycrystalline Fe. The addition of 7 at.% Au to the alloy prevents this recrystallization and preserves the amorphous state but does not prevent the structural relaxation which reducesK u at lower temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616986
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Spectroscopic study of potential magneto-optic storage layers (1989)
    Springer
    Applied physics 49 (1989), S. 599-618 
    Details
    ISSN: 1432-0630
    Keywords: 75.70 ; 78.20L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We present an experimental investigation of magneto-optic (MO) thin film materials of interest in optical storage. XPS valence band spectra of ultrahigh vacuum deposited rare earth — Fe50Co50 alloys are correlated to magneto-optic and reflectivity spectra measured ex-situ in the photon energy range 0.5 ≦E ph ≦ 5.5 eV. It is found that 4f n →4f n−15d 1 optical transitions contribute to room temperature Kerr spectra in Pr-FeCo and Nd-FeCo, but only in the UV spectral region (λ≦300 nm). Eu is found to enter Eu-FeCo intermetallic alloys with a 4f 7 ground state at −2 eV binding energy. However, no substantial contribution to the Kerr effect from excitations of this electronic state has been observed n either at room temperaturen or at 100 K. We present a general argument that 4f excitations of RE ions in typical intermetallic alloys can never be expected to contribute more than some tenths of a degree toθ k in contrast to the well known huge rotations in RE-chalcogenides. For Yb-FeCo we have observed in XPS a mixed valence behavior of Yb showing a discontinuous transition from divalent Yb2+ in the pure metal to mixed valent Yb2.55+ in amorphous Yb-FeCo films. Nof→d contributions to the room temperature MO spectra have been detected. Strong optical enhancement effects are presented for metallic bilayer and multilayer structures of the type MO-layer/reflector. The total thickness of an optimized structure corresponds to about two times the penetration depth of light. Enhancement occurs predominantly at photon energies below the plasma frequency of the reflector material and is caused by low values of the optical constantsn andk of the reflector. In storage materials like Tb-FeCo the read-out performance can be improved by about a factor of 2 with a bilayer of 30 nm Tb-FeCo on Cu. Quantitative modelling of the optical and magneto-optic properties of these films is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616985
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Magnetic properties of thin epitaxial films investigated by spin-polarized photoemission (1989)
    Springer
    Applied physics 49 (1989), S. 449-458 
    Details
    ISSN: 1432-0630
    Keywords: 75.70 ; 79.60 ; 75.60 ; 68.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The surface sensitivity of the spin-polarized photoemission experiment was exploited to study two-dimensional magnetism. The magnetization of thin films of Fe, Co, and V in the monolayer (ML) range, grown on Cu(001) and Ag(001) single crystals, was measured as a function of perpendicularly applied field and temperature. Bcc Fe films and fcc Fe and Co films exhibit ferromagnetism down to the single monolayer range, while no evidence for ferromagnetism is found for V on Ag(001). All Co films are magnetized in plane and have a Curie temperature far above room temperature. A thickness dependence of the anisotropy and Curie temperature is observed for the two phases of Fe. Remanent magnetization perpendicular to the surface is found at 30 K for fcc Fe films thicker than 2 ML and for bcc Fe between 3 and 4 ML. The magnetic effects caused by coating and by interdiffusion are discussed in the light of measurements of Cu/Fe/Cu sandwiches and of overlayers obtained by simultaneous evaporation of Fe and Cu. The fcc Fe films are shown to be suitable for thermomagnetic writing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617011
    Location Call Number Expected 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...