Abstract
Faraday rotation (FR) measurements performed on single crystals Erbium Iron Garnet (ErIG) at 1.15 μm wavelength are presented in a magnetic field up to 20 kOe applied along the three main crystallographic directions. Spontaneous FR and FR susceptibilities are found to be anisotropic. The results are discussed in terms of electric and magnetic dipole transitions and compared to the magnetic anisotropy. A strong anisotropy of the first order electric dipole coefficient of the Er 3+ ion is evidenced at low temperature (below 30 K).
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