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Abstract
An experimental study on a new magneto-optic effect, the partially circular polarization of the spectral thermal i.r. and vis emission from the ferromagnets iron, cobalt and nickel is presented. Measurements have been performed at photon energies from 0.2 to 2.0 eV and at temperatures between 600 and 1100 K. Results are correlated to parameters of the magneto-optic Kerr effect. The circular polarization is proportional to the magnetization, vanishes above the Curie temperature and changes sign at 1.3eV for iron, at 1.8eV for cobalt and at 0.3 eV for nickel. In addition, the circular polarization of the spectral thermal emission was studied at the hcp-fcc phase transition of cobalt at 700 K, where no Kerr-effect data are available. Finally, another new magneto-optic effect on the spectral thermal emission is suggested on the basis of the present investigation.
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