The effect of octahedral Fe3+and tetrahedral Fe3+dilution on the Faraday spectra of bismuth-doped iron garnets

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Abstract
The Faraday spectra between 450 nm and 800 nm are reported for the series of garnets BixY3-xFe5O12, BixY3-xFe5-yGay- O12(y=1.0) and BixY3-xFe5-zSczO12(z=0.4, 0.8) and a similar series without bismuth. The component of Faraday rotation induced by the bismuth in these series has a diamagnetic wavelength dependence and indicates that a transition/transitions around 24000 cm-1 is a major contributor to the induced component. The behaviour of the induced component with octahedral Fe3+ and tetragedral Fe3+ concentration shows that both sublattices are involved and is consistent with the observations that the band at 23200 cm-1 is an Fe3+ pair transition. The strength of the induced Faraday component, in the above series, normalized to bismuth, octahedral Fe3+ and tetrahedral Fe3+ concentrations and octahedral/tetrahedral magnetic moments is a constant. The magnitude of the induced Faraday component cannot be accounted for assuming the Bi3+ ions split only the 23200 cm-1 pair band in YIG.