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Composition dependence of the magnetooptical properties of HoIG:Al single crystals

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2 Author(s)
Ostorero, J. ; Lab. de Chimie Metallurgique et Spectroscopie des Terres Rares, CNRS, Meudon, France ; Guillot, M.

The Faraday rotation of aluminum substituted holmium iron garnets single crystals of composition Ho3Fe5-zAlz O12 has been investigated at 1152 nm wavelength in the 6 K<T<TNeel temperature range. A magnetic field up to 20 kOe was applied along the [111] easy axis of five platelets of composition z=0.45, 0.57, 1.15, 2.05 and 2.5 obtained from as grown single crystals. The experimental data were extrapolated to H=O to get the spontaneous Faraday rotation Φs(z, T) and linear susceptibility χF(Z, T) values. In contrast to the absolute values of Φs, the temperature variation of χ F shows a discontinuity at the compensation temperature. χF is Al-concentration dependent particularly when T<100 K due to the decrease of the Ho3+-F3+ interactions. The gyroelectric coefficient of the Ho3+ ions due to electric dipole transitions Ce(z, T) deduced from the experimental values is independent of z for z<1.15, and is linearly temperature dependent when T>50 K

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Magnetics, IEEE Transactions on  (Volume:30 ,  Issue: 6 )