Title :
Composition dependence of the magnetooptical properties of HoIG:Al single crystals
Author :
Ostoréro, J. ; Guillot, M.
Author_Institution :
Lab. de Chimie Metallurgique et Spectroscopie des Terres Rares, CNRS, Meudon, France
fDate :
11/1/1994 12:00:00 AM
Abstract :
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
Keywords :
Faraday effect; garnets; holmium compounds; magnetic susceptibility; magneto-optical effects; optical rotation; 1152 nm; 6 to 100 K; Faraday rotation; Ho3Fe5-zAlzO12; Ho3+ ions; HoAGIG; HoAl5O12Fe5O12; HoIG:Al single crystals; aluminum substituted holmium iron garnets; composition dependence; electric dipole transitions; gyroelectric coefficient; linear susceptibility; magnetic field; magnetooptical properties; platelets; spontaneous Faraday rotation; Aluminum; Crystals; Garnets; Iron; Magnetic anisotropy; Magnetic field measurement; Magnetic properties; Perpendicular magnetic anisotropy; Temperature dependence; Temperature distribution;
Journal_Title :
Magnetics, IEEE Transactions on
