Faraday rotation in single crystal erbium iron garnet |
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Authors: | P. Feldmann H. Le Gall J.M. Desvignes M. Guillot A. Marchand |
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Affiliation: | CNRS, Laboratoire de Magnétisme et d''Optique des Solides, 92190 Meudon-Bellevue, France;Laboratoire Louis Néel, Laboratoire Propre du CNRS, Associé à l''USMG, 166 X, 38042 Grenoble cedex, France |
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Abstract: | Measurements of the Faraday rotation of ErIG, Er3Fe5O12, have been performed in the 4.2–300 K temperature range in magnetic field up to 20 kOe applied along the [111] direction and at 1.15 μm wavelength. The results are analysed under the assumption that the contribution of the Fe3+ ions to the total Faraday rotation is the same as that of YIG, Y3Fe5O12. The temperature and field dependences of the contribution of the Er3+ ions are deduced. Both magnetic and electric dipole contributions of the Er3+ ions are calculated; the electric dipole coefficient Ce is found to present a linear temperature dependence between 30–300 K. The temperature dependence of the Faraday rotation susceptibility differs strongly from that of the magnetic susceptibility. |
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