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  • 75.70.Ak  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Lowering of magnetic field intensity at the surfaces of α-Fe2O3 and FeBO3 single crystals (2000)
    Springer
    JETP letters 71 (2000), S. 134-137 
    Details
    ISSN: 1090-6487
    Keywords: 75.70.Ak ; 76.80.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Depth-selective conversion electron Mössbauer spectroscopy was used to study magnetic properties of the thin surface layers of the α-Fe2O3 and FeBO3 single crystals. An analysis of the experimental spectra indicates that the magnetic properties of the layers at a depth of more than ∼100 nm from the surface are similar to the properties of crystal bulk, and the corresponding spectra consist of narrow lines. The lines gradually broaden as the crystal surface is approached. The spectra of the ∼10-nm-thick surface layers consist of broad lines, indicating a wide distribution δ=2.1 T of the effective magnetic field about its mean value of 32.2(4) T. The experimental spectra were used to determine the effective magnetic fields (H eff) for the iron ions situated in the surface layers of thickness ∼100 nm. The effective fields in these layers were found to gradually decrease at room temperature (291 K) as the crystal surface was approached. The H eff values in the 2.4(9)-nm-thick surface layer of the α-Fe2O3 crystal and 4.9(9)-nm layer of FeBO3 are 0.7(2) and 1.2(3)%, respectively, smaller than for the nuclei of the ions in the bulk of these crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568298
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  • 2
    Electronic Resource
    Electronic Resource
    Investigations of the magnetic structure of the surface and volume of aluminum-substituted Sr-M type hexaferrites (1998)
    Springer
    JETP letters 67 (1998), S. 843-848 
    Details
    ISSN: 1090-6487
    Keywords: 75.70.Ak ; 75.50.Dd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic structure of the surface layer of single crystals of hexagonal ferrites of the type Sr-M (SrFe12O19) in which some iron ions are replaced by diamagnetic Al ions is investigated, in direct comparison with the magnetic structure in the bulk of the sample, by the method of simultaneous gamma, x-ray, and electron Mössbauer spectroscopy. It is found that under conditions of diamagnetic dilution of the magnetic lattice of hexagonal ferrites of the type Sr-M by Al ions, a layer ~200 nm thick in which the orientation of the magnetic moments is not collinear with the direction of the moments in the bulk of the sample is observed on the surface of SrFe10.2Al1.8O19 crystals. Thus a “transitional” surface layer has been observed on macroscopic ferromagnetic crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567759
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    Paper (German National Licenses)
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