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Magneto-Optical Properties of the Eu-Chalcogendes

  • J. O. Dimmock
Conference paper

Abstract

The Eu-chalcogenides, EuO, EuS, EuSe, and EuTe exhibit remarkably large magneto-optical effects in the visible and infrared spectral regions arising from highly polarized europium 4f7 → 4f65d optical transitions. Faraday rotations as large as 8.5 × 105 deg/cm have been observed in EuO at 20° K and a wavelength of 0.7 µ, comparable to the value observed in iron. However, in contrast to the metallic ferromagnets, the Eu-chalcogenides are relatively transparent in this wavelength region. For example, at 0.75 µ and 4.2°K EuSe has a Faraday rotation of 1.4 x 105 deg/cm and an absorption coefficient of only 66 cm-1. This results in a specific rotation per unit attenuation of 500 deg/dB, approximately four orders of magnitude greater than that of iron. In the infrared, at energies below the semiconducting band-gap, the absorption is less and the specific rotation per unit attenuation can be even larger. The specific rotation of EuO at low temperatures is in excess of 2 x 104 deg/dB at 2.5 µ and 230 deg/dB at 10.6 µ These materials also exhibit remarkably large Kerr effects with longitudinal Kerr rotations as large as 2ϕ = 2.1° being observed in EuO at 12°K, 0.56 µ and 30° angle of incidence. The Kerr effects can also be considerably enhanced by antireflection coating and/or by depositing the film on a mirror substrate. These very large effects are of considerable technological importance and the possible use of the Eu-chalcogenides for magneto-optical memory systems, amplitude and phase modulation of light beams and optical isolators for laser systems will be briefly indicated.

Keywords

Faraday Rotation Kerr Effect Specific Rotation Metallic Ferromagnet Mirror Substrate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1971

Authors and Affiliations

  • J. O. Dimmock
    • 1
  1. 1.Lincoln LaboratoryMassachusetts Institute of TechnologyLexingtonUSA

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