Magnetic properties on holmium iron garnet in high magnetic field. Optical absorption spectra in the infra-red region |
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Authors: | Maurice Guillot André Marchand François Tcheou H Le Gall |
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Institution: | (1) Laboratoire Louis Néel, CNRS-USMG, 25, Avenue des Martyrs, B.P. 166 X, F-38042 Grenoble, France;(2) DRF/CENG, B.P. 85 X, F-38041 Grenoble, France;(3) Laboratoire de Magnétisme et d'Optique des Solides, 1, Place Aristide-Briand, F-92190 Meudon Bellevue, France |
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Abstract: | On single crystals of holmium iron garnet (HoIG), magnetic properties have been studied in magnetic field up to 150kOe applied parallel to the main crystallographic directions in the 4.2–300K temperature range. Above 130 K, the magnetization is isotropic and linear magnetic field dependent as previously found in polycrystals and predicted by Néel's ferrimagnetic theory. Nevertheless the paramagnetic Curie temperature is much higher than the polycrystal value. Below 130K, due to the onset of the umbrella structure, the ferrite magnetization presents a non linear field variation with 111] as easy direction. The field evolutions of the anisotropy constants (K
1 andK
2) were calculated. Optical absorption measurements of both 58 5I
6 and 5I
8 5I
7 transitions are reported and compared to the results of the literature in terms of inequivalent magnetic sites. |
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Keywords: | |
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