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  • Articles: DFG German National Licenses  (4)
  • 1990-1994  (4)
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  • Articles: DFG German National Licenses  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Spin-dependent x-ray absorption in Co/Pt multilayers : 35TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS San Diego, California (USA) 29 Oct−1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5655-5657 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spin-dependent absorption spectroscopy or circular magnetic x-ray dichroism studies at the L2,3 edges of 5d atoms in ferromagnetic hosts have been used to investigate the spin-density distribution of the empty d-projected states and thus the local magnetic moment of the absorbing 5d atoms. This method was applied to study the average polarization of the Pt atom in Co/Pt multilayers with different modulation lengths. The spin-dependent absorption profiles for vapor-deposited [25(4 A(ring) Co+x A(ring) Pt), x=9, 16, 23, 30, 40] multilayers indicate a significant average Pt polarization decreasing with the layer thickness. The experimental results are discussed in comparison with spin-polarized relativistic band-structure calculations (linear muffin-tin-orbital calculations).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347926
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of local magnetic moments of 5d impurities in Fe detected via spin-dependent absorption : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6147-6149 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spectroscopy of spin-dependent absorption using circularly polarized synchrotron radiation is a new method to study the magnetic structure of multicomponent systems. We demonstrate for substitutional 5d transition-metal impurities in an iron host that from L2,3 spin-dependent absorption signal information on the local magnetic moment, carried by the d electrons of the absorbing atom, can be deduced. The experimentally determined local magnetic moments of the 5d impurities in Fe are in good agreement with the theoretical results based on the spin-polarized relativistic Korringa–Kohn–Rostoker–Green function method of band-structure calculation. The presented data are−to our knowledge−the first experimental proof of the change from antiferro- to ferromagnetic coupling between Os and Ir, which has been predicted by the above-mentioned calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348786
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Spin-dependent x-ray absorption in Co/Pt multilayers and Co50Pt50 alloy (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4456-4458 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spin dependence of L2,3 absorption in 5d atoms oriented in a ferromagnetic matrix contains information on the spin density of the empty d-projected states of the absorbing atom. Spin-dependent absorption spectroscopy using circularly polarized synchrotron radiation was applied to study the polarization of the Pt atoms in the binary alloy Co50Pt50 and Pt/Co layered structures, which are promising candidates for magneto-optical recording. The spin-dependent absorption signals for vapor-deposited 250(4 A(ring) Co+18 A(ring) Pt) and 250(6 A(ring) Co+18 A(ring) Pt) multilayers indicate a ferromagnetic coupling on Pt and Co atoms with a significant Pt polarization. This is reduced on average by about 60% with respect to the Pt polarization in the Co50Pt50 alloy. The experimental results are discussed on the basis of spin-polarized band-structure calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344903
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Theoretical and experimental investigation of the magnetic x-ray dichroism of early 5d impurity atoms dissolved in ferromagnetic Fe (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4923-4925 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polarization-dependent x-ray absorption is now going to be established as a new probe to study the magnetic and electronic structure of multicomponent systems. New experimental results are presented for early 5d impurity atoms dissolved in ferromagnetic Fe. The observed spectra clearly reflect the antiferromagnetic coupling of the local spin magnetic moment of the early 5d impurity atoms to the magnetization of the Fe host. From the data it is concluded that the change to a ferromagnetic coupling occurs at a higher atomic number in the 5d transition-metal series than deduced earlier from neutron scattering measurements. This conclusion is supported by first-principle calculations for the absorption spectra, which are based on the spin-polarized relativistic Korringa–Kohn–Rostoker–Green function method of band-structure calculation. The theoretical approach presented here, which has recently been applied to calculate the spectra of some late 5d impurities in Fe, results in a very satisfying agreement with experiment and allows a detailed, parameter-free discussion of the observed spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346067
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    Paper (German National Licenses)
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