Magnetic dichroism and anisotropy of exchange interaction in ytterbium iron garnetстатья
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Дата последнего поиска статьи во внешних источниках: 19 сентября 2015 г.
Аннотация:Anisotropy of magnetic linear and circular dichroism in the region of the 2F7/2-2F5/2 absorption band of the Yb3+ ion is investigated experimentally and theoretically when magnetizing along main crystallographic directions of ytterbium iron garnet in the temperature interval 50–150 K. The Judd-Ofelt approximation is proved to be valid for calculation of oscillator strengths of the transitions between individual Stark levels for the Yb3+ ion. Parameters which determine the intensities of polarized spectra for Yb3+ ion are obtained when fitting experimental and theoretical spectra. Strongly anisotropic exchange splittings are determined within the crystal field model. Consideration of anisotropy of rare earth-iron exchange is essential for a description of the observed anisotropy of magnetic dichroism spectra. The intensities of polarized spectra are shown to be more sensitive than the exchange energy splittings to parameters of centrosymmetric crystal field.