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Mössbauer studies of the surface and bulk magnetic structure of scandium-substituted Ba-M-type hexaferrites

  • Magnetism and Ferroelectricity
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Abstract

A direct comparison of the magnetic structures of a surface layer and of the bulk of Ba-M-type hexagonal ferrites with iron ions partially replaced by Sc diamagnetic ions (BaFe12−x ScxO19) has been made by simultaneous Mössbauer spectroscopy with detection of gamma rays, characteristic x-ray emission, and electrons. It has been found that, if the magnetic lattice of a Ba-M-type hexagonal ferrite is weakly diluted by Sc diamagnetic ions, a ∼300-nm thick macroscopic layer forms on the surface of a BaFe11.4Sc0.6O19 crystal, in which the iron-ion magnetic moments are noncollinear with the moments in the bulk. The noncollinear magnetic structure forms in the near-surface layer of BaFe12−x ScxO19 crystals because the exchange interaction energy is additionally reduced by the presence of such a “defect” as the surface. This is the first observation in ferromagnetic crystals of an anisotropic surface layer whose magnetic properties, as predicted by Néel, differ from those of the bulk.

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Authors and Affiliations

  1. A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021, St. Petersburg, Russia

    A. S. Kamzin & V. L. Rozenbaum

  2. Kharkov State University, 310077, Kharkov, Ukraine

    L. P. Ol’khovik

Authors
  1. A. S. Kamzin
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  2. V. L. Rozenbaum
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  3. L. P. Ol’khovik
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Fiz. Tverd. Tela (St. Petersburg) 41, 483–490 (March 1999)

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Kamzin, A.S., Rozenbaum, V.L. & Ol’khovik, L.P. Mössbauer studies of the surface and bulk magnetic structure of scandium-substituted Ba-M-type hexaferrites. Phys. Solid State 41, 433–439 (1999). https://doi.org/10.1134/1.1130797

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  • DOI: https://doi.org/10.1134/1.1130797

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