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1 Materials Science Poland

1 2008

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Spectral dependence of magnetooptical Kerr effect in EuS-based ferromagnetic semiconductor multilayers

Szot M., Kowalczyk L., Smajek E., Volobuev V. V., Sipatov A. Y., Story T.

Materials Science Poland

2008

Vol. 26, No. 4

1033--1037

The magnetooptical Kerr effect (MOKE) magnetometry was used to study the magnetic hysteresis loops of EuS-PbS and EuS-SrS semiconductor epitaxial multilayers composed of ferromagnetic layers of EuS and nonmagnetic ultrathin spacer layers of PbS or SrS. The spectral dependence of the MOKE in EuS-based semiconductor multilayers was studied in the photon energy range covering the fundamental interband electronic transitions in EuS. The measurements of the longitudinal MOKE established two maxima on the spectral dependence of the Kerr rotation for the photon energy hν = 1.65 eV and hν = 2.1 eV. This experimental finding is explained based on the model of the electronic band structure of EuS. The observed maxima of the Kerr rotation correspond to the electronic transitions from the localized 4f levels of Eu2+ ions and from 3p valence band to the 5d-6s conduction band of EuS. Spectral dependence of magnetooptical Kerr effect in EuS-based ferromagnetic semiconductor multilayers.